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Fair Value Disclosures - Summary of Assets and Liabilities Related to Financial Instruments, Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior notes $ 1,412,463 $ 1,410,804
Deferred loan costs–loans payable 5,298 2,424
Level 2 | Recurring | Book Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior notes 1,425,892 1,425,397
Deferred loan costs–loans payable 13,400 14,600
Level 2 | Recurring | Fair Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior notes $ 1,395,794 $ 1,308,826