Annual report pursuant to Section 13 and 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) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Payables due 2018 $ 372  
Payables due 2019 105,393  
Payables due 2020 100,413  
Payables due 2021 103,122  
Payables due 2022 394  
Payables due Thereafter 1,432,980  
Line of credit 105,000 $ 253,000
Term notes, outstanding 1,625,000 1,400,000
Mortgage note, total 12,674 $ 13,027
Term notes, outstanding amount 1,742,674  
Line of credit - variable rate LIBOR + 1.10% (2.63% at December 31, 2017) [Member]    
Debt Instrument [Line Items]    
Payables due 2019 105,000  
Line of credit 105,000  
Debt instrument, fair value 105,000  
Term note - variable rate LIBOR+1.15% (2.53% at December 31, 2017) [Member]    
Debt Instrument [Line Items]    
Payables due 2020 100,000  
Term notes, outstanding 100,000  
Term note, fair value 100,000  
Term Note - Fixed Rate 5.54% [Member]    
Debt Instrument [Line Items]    
Payables due 2021 100,000  
Term notes, outstanding 100,000  
Term note, fair value 109,192  
Term Note - Fixed Rate 4.533% [Member]    
Debt Instrument [Line Items]    
Payables due Thereafter 175,000  
Term notes, outstanding 175,000  
Term note, fair value 181,510  
Term Note - Fixed Rate 3.50% [Member]    
Debt Instrument [Line Items]    
Payables due Thereafter 600,000  
Term notes, outstanding 600,000  
Term note, fair value 585,092  
Term Note - Fixed Rate 3.875% [Member]    
Debt Instrument [Line Items]    
Payables due Thereafter 450,000  
Term notes, outstanding 450,000  
Term note, fair value 449,076  
Term Note - Fixed Rate 3.67% [Member]    
Debt Instrument [Line Items]    
Payables due Thereafter 200,000  
Term notes, outstanding 200,000  
Term note, fair value 192,447  
Mortgage Note - Fixed Rate 4.98% [Member]    
Debt Instrument [Line Items]    
Payables due 2018 53  
Payables due 2019 56  
Payables due 2020 59  
Payables due 2021 2,748  
Mortgage note, total 2,916  
Debt instrument, fair value 3,007  
Mortgage Note - Fixed Rate 4.065% [Member]    
Debt Instrument [Line Items]    
Payables due 2018 92  
Payables due 2019 96  
Payables due 2020 99  
Payables due 2021 104  
Payables due 2022 108  
Payables due Thereafter 3,620  
Mortgage note, total 4,119  
Debt instrument, fair value 4,112  
Mortgage Note - Fixed Rate 5.26% [Member]    
Debt Instrument [Line Items]    
Payables due 2018 67  
Payables due 2019 71  
Payables due 2020 74  
Payables due 2021 78  
Payables due 2022 83  
Payables due Thereafter 3,566  
Mortgage note, total 3,939  
Debt instrument, fair value 4,169  
Mortgage Note - Fixed Rate 5.99% [Member]    
Debt Instrument [Line Items]    
Payables due 2018 160  
Payables due 2019 170  
Payables due 2020 181  
Payables due 2021 192  
Payables due 2022 203  
Payables due Thereafter 794  
Mortgage note, total 1,700  
Debt instrument, fair value $ 1,822