Annual report pursuant to Section 13 and 15(d)

Unsecured Line of Credit and Term Notes - Additional Information (Detail)

v3.10.0.1
Unsecured Line of Credit and Term Notes - Additional Information (Detail)
12 Months Ended
Oct. 30, 2018
USD ($)
Dec. 07, 2017
USD ($)
Jul. 21, 2016
USD ($)
Jun. 20, 2016
USD ($)
May 17, 2016
USD ($)
Bridge_Loan
Apr. 08, 2014
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2011
USD ($)
Debt Instrument [Line Items]                    
Term notes, outstanding amount             $ 1,625,000,000 $ 1,625,000,000    
Unamortized senior term note discount             4,402,000 4,949,000    
Underwriting discount and other offering expenses             2,126,000 3,961,000 $ 15,273,000  
Interest expense - bridge financing commitment fee                 7,329,000  
Amortization expense related to deferred debt issuance costs             $ 3,621,000 $ 4,289,000 9,688,000  
Bridge Facilities [Member]                    
Debt Instrument [Line Items]                    
Number of bridge facilities | Bridge_Loan         2          
Senior unsecured acquisition bridge facilities, amount         $ 1,675,000,000          
Interest expense - bridge financing commitment fee                 7,300,000  
Bridge loan, termination date         Jun. 29, 2016          
Maximum [Member]                    
Debt Instrument [Line Items]                    
Leverage ratio percentage             60.00%      
Indenture covenant percentage on unencumbered assets             150.00%      
Minimum [Member]                    
Debt Instrument [Line Items]                    
Interest coverage ratio on debt             150.00%      
Secured Debt [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Leverage ratio percentage             40.00%      
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Revolving credit limit $ 500,000,000           $ 500,000,000      
Line of credit facility, expiration date Dec. 10, 2019           Mar. 10, 2023      
Facility fee             0.15%      
Interest rate, line of credit facility             3.47% 2.63%    
Basis spread over LIBOR             0.95%      
Amount available on unsecured revolving line of credit             $ 408,200,000      
Term Note Due June 4, 2020 [Member]                    
Debt Instrument [Line Items]                    
Debt instrument,maturity date             Jun. 04, 2020      
Term notes, outstanding amount             $ 100,000,000 $ 100,000,000    
Debt instrument principal amount             $ 325,000,000      
Repayments of unsecured term note               $ 225,000,000    
Debt instrument variable interest rate             3.52% 2.53%    
Term Note Due June 4, 2020 [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt instrument,maturity date Jun. 04, 2020                  
Debt instrument principal amount $ 100,000,000                  
Basis spread over LIBOR             1.00%      
Term Note [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Revolving credit limit $ 900,000,000                  
Senior Term Note Due December 15, 2027 [Member]                    
Debt Instrument [Line Items]                    
Term notes, outstanding amount             $ 450,000,000 $ 450,000,000    
Senior Term Note Due December 15, 2027 [Member] | Unsecured Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Debt instrument,maturity date   Dec. 15, 2027                
Debt instrument principal amount   $ 450,000,000                
Debt instrument stated interest rate   3.875%                
Debt instrument percentage discount to par   0.477%                
Debt instrument, interest payable description             Interest on the 2027 Senior Notes is payable semi-annually in arrears on June 15 and December 15.      
Unamortized senior term note discount   $ 2,100,000                
Underwriting discount and other offering expenses   4,000,000                
Proceeds from senior notes, net   $ 443,900,000                
Senior Term Note Due July 1, 2026 [Member]                    
Debt Instrument [Line Items]                    
Term notes, outstanding amount             $ 600,000,000 600,000,000    
Senior Term Note Due July 1, 2026 [Member] | Unsecured Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Debt instrument,maturity date       Jul. 01, 2026            
Debt instrument principal amount       $ 600,000,000            
Debt instrument stated interest rate       3.50%            
Debt instrument percentage discount to par       0.553%            
Debt instrument, interest payable description             Interest on the 2026 Senior Notes is payable semi-annually in arrears on January 1 and July 1.      
Unamortized senior term note discount       $ 3,300,000            
Underwriting discount and other offering expenses       5,500,000            
Proceeds from senior notes, net       $ 591,200,000            
Term Note Due July 21, 2028 [Member]                    
Debt Instrument [Line Items]                    
Debt instrument,maturity date     Jul. 21, 2028              
Term notes, outstanding amount             $ 200,000,000 200,000,000    
Debt instrument stated interest rate     3.67%              
Additional secured term note     $ 200,000,000              
Term Note Due April 8, 2024 [Member]                    
Debt Instrument [Line Items]                    
Debt instrument,maturity date           Apr. 08, 2024        
Term notes, outstanding amount             175,000,000 175,000,000    
Debt instrument stated interest rate           4.533%        
Additional secured term note           $ 175,000,000        
Term Note Due April 8, 2024 [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Debt instrument stated interest rate           6.283%        
Term Note Due August 5, 2021 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, expiration date                   Aug. 05, 2021
Term notes, outstanding amount             100,000,000 100,000,000    
Debt instrument stated interest rate                   5.54%
Additional secured term note                   $ 100,000,000
Term Note Due August 5, 2021 [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Debt instrument stated interest rate                   7.29%
Senior Notes and Term Notes [Member]                    
Debt Instrument [Line Items]                    
Amortization expense related to deferred debt issuance costs             $ 2,200,000 $ 3,000,000 $ 1,700,000