Quarterly report pursuant to Section 13 or 15(d)

Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Detail)

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Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Payables due 2018 $ 95
Payables due 2019 128,393
Payables due 2020 100,413
Payables due 2021 103,122
Payables due 2022 394
Payables due Thereafter 1,432,980
Debt obligations 1,765,397
Line of credit - variable rate LIBOR + 1.10% (3.28% at September 30, 2018) [Member]  
Debt Instrument [Line Items]  
Payables due 2019 128,000
Debt obligations 128,000
Debt instrument, fair value 128,000
Term note - variable rate LIBOR+1.15% (3.25% at September 30, 2018) [Member]  
Debt Instrument [Line Items]  
Payables due 2020 100,000
Debt obligations 100,000
Term note, fair value 100,000
Term Note - Fixed Rate 5.54% [Member]  
Debt Instrument [Line Items]  
Payables due 2021 100,000
Debt obligations 100,000
Term note, fair value 104,084
Term Note - Fixed Rate 4.533% [Member]  
Debt Instrument [Line Items]  
Payables due Thereafter 175,000
Debt obligations 175,000
Term note, fair value 176,767
Term Note - Fixed Rate 3.50% [Member]  
Debt Instrument [Line Items]  
Payables due Thereafter 600,000
Debt obligations 600,000
Term note, fair value 563,528
Term Note - Fixed Rate 3.875% [Member]  
Debt Instrument [Line Items]  
Payables due Thereafter 450,000
Debt obligations 450,000
Term note, fair value 421,815
Term Note - Fixed Rate 3.67% [Member]  
Debt Instrument [Line Items]  
Payables due Thereafter 200,000
Debt obligations 200,000
Term note, fair value 180,734
Mortgage Note - Fixed Rate 4.98% [Member]  
Debt Instrument [Line Items]  
Payables due 2018 14
Payables due 2019 56
Payables due 2020 59
Payables due 2021 2,748
Debt obligations 2,877
Debt instrument, fair value 2,887
Mortgage Note - Fixed Rate 4.065% [Member]  
Debt Instrument [Line Items]  
Payables due 2018 23
Payables due 2019 96
Payables due 2020 99
Payables due 2021 104
Payables due 2022 108
Payables due Thereafter 3,621
Debt obligations 4,051
Debt instrument, fair value 3,911
Mortgage Note - Fixed Rate 5.26% [Member]  
Debt Instrument [Line Items]  
Payables due 2018 17
Payables due 2019 71
Payables due 2020 74
Payables due 2021 78
Payables due 2022 83
Payables due Thereafter 3,565
Debt obligations 3,888
Debt instrument, fair value 3,944
Mortgage Note - Fixed Rate 5.99% [Member]  
Debt Instrument [Line Items]  
Payables due 2018 41
Payables due 2019 170
Payables due 2020 181
Payables due 2021 192
Payables due 2022 203
Payables due Thereafter 794
Debt obligations 1,581
Debt instrument, fair value $ 1,638