Unsecured Line of Credit and Term Notes - Additional Information (Detail) - USD ($)
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3 Months Ended |
6 Months Ended |
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Sep. 23, 2020 |
Jun. 03, 2019 |
Dec. 07, 2017 |
Jul. 21, 2016 |
Jun. 20, 2016 |
Apr. 08, 2014 |
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
Dec. 31, 2020 |
| Debt Instrument [Line Items] |
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| Amount available on unsecured revolving line of credit |
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$ 359,900,000
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$ 359,900,000
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| Unamortized senior term note discount |
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$ 6,250,000
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6,250,000
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$ 6,710,000
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| Amortization expense related to deferred debt issuance costs |
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$ 2,123,000
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$ 2,025,000
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| Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Leverage ratio percentage |
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60.00%
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| Indenture covenant percentage on unencumbered assets |
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150.00%
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| Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Interest coverage ratio on debt |
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1.50%
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| Secured Debt [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Leverage ratio percentage |
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40.00%
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| Term Note [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument variable interest rate |
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1.09%
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1.09%
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1.14%
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| Term Note [Member] | LIBOR [Member] |
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| Debt Instrument [Line Items] |
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| Basis spread over LIBOR |
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1.00%
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| Senior Term Note Due October 15, 2030 [Member] | Unsecured Senior Notes [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument principal amount |
$ 400,000,000
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| Debt instrument,maturity date |
Oct. 15, 2030
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| Debt instrument stated interest rate |
2.20%
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| Debt instrument percentage discount to par |
0.476%
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| Debt instrument, interest payable description |
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Interest on the 2030 Senior Notes is payable semi-annually in arrears on each April 15 and October 15.
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| Unamortized senior term note discount |
$ 1,900,000
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| Underwriting discount and other offering expenses |
3,500,000
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| Proceeds from senior notes, net |
$ 394,600,000
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| Senior Term Note Due June 15, 2029 [Member] | Unsecured Senior Notes [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument principal amount |
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$ 350,000,000
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| Debt instrument,maturity date |
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Jun. 15, 2029
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| Debt instrument stated interest rate |
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4.00%
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| Debt instrument percentage discount to par |
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0.524%
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| Debt instrument, interest payable description |
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Interest on the 2029 Senior Notes is payable semi-annually in arrears on each June 15 and December 15.
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| Unamortized senior term note discount |
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$ 1,800,000
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| Underwriting discount and other offering expenses |
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3,100,000
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| Proceeds from senior notes, net |
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$ 345,100,000
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| Senior Term Note Due December 15, 2027 [Member] | Unsecured Senior Notes [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument principal amount |
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$ 450,000,000
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| Debt instrument,maturity date |
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Dec. 15, 2027
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| Debt instrument stated interest rate |
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3.875%
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| Debt instrument percentage discount to par |
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0.477%
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| Debt instrument, interest payable description |
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Interest on the 2027 Senior Notes is payable semi-annually in arrears on each June 15 and December 15.
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| Unamortized senior term note discount |
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$ 2,100,000
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| Underwriting discount and other offering expenses |
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4,000,000.0
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| Proceeds from senior notes, net |
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$ 443,900,000
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| Senior Term Note Due July 1, 2026 [Member] | Unsecured Senior Notes [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument principal amount |
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$ 600,000,000
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| Debt instrument,maturity date |
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Jul. 01, 2026
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| Debt instrument stated interest rate |
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3.50%
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| Debt instrument percentage discount to par |
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0.553%
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| Debt instrument, interest payable description |
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Interest on the 2026 Senior Notes is payable semi-annually in arrears on each January 1 and July 1.
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| Unamortized senior term note discount |
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$ 3,300,000
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| Underwriting discount and other offering expenses |
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5,500,000
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| Proceeds from senior notes, net |
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$ 591,200,000
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| Term Note Due July 21, 2028 [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument,maturity date |
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Jul. 21, 2028
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| Debt instrument stated interest rate |
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3.67%
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| Additional secured term note |
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$ 200,000
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| Term Note Due April 8, 2024 [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument,maturity date |
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Apr. 08, 2024
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| Debt instrument stated interest rate |
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4.533%
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| Additional secured term note |
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$ 175,000,000
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| Term Note Due April 8, 2024 [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument stated interest rate |
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6.283%
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| Senior Notes and Term Notes [Member] |
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| Debt Instrument [Line Items] |
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| Amortization expense related to deferred debt issuance costs |
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$ 600,000
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$ 600,000
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$ 1,200,000
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$ 1,200,000
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| Revolving Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Revolving credit limit |
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$ 500,000,000
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$ 500,000,000
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| Line of credit facility, expiration date |
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Mar. 10, 2023
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| Facility fee |
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0.15%
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| Interest rate, line of credit facility |
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1.04%
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1.04%
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1.09%
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| Revolving Credit Facility [Member] | LIBOR [Member] |
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| Debt Instrument [Line Items] |
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| Basis spread over LIBOR |
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0.95%
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| Revolving Credit Facility [Member] | Term Note [Member] |
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| Debt Instrument [Line Items] |
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| Revolving credit limit |
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$ 900,000,000
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$ 900,000,000
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| Revolving Credit Facility [Member] | Term Note Due June 4, 2020 [Member] |
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| Debt Instrument [Line Items] |
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| Debt instrument principal amount |
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$ 100,000,000
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$ 100,000,000
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| Debt instrument,maturity date |
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Jun. 04, 2020
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