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Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (9,038)  
Total Senior Notes 1,647,963 $ 1,646,007
Total Term Loan 99,460 49,655
Mortgage indebtedness 94,874 88,743
Unsecured Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 1,660,000 1,660,000
Senior notes – discount, net (3,800) (4,300)
Net unamortized debt issuance costs (8,200) (9,700)
Total Senior Notes $ 1,648,000 $ 1,646,000
Debt Instrument Maturity Date, Start 2022-07  
Debt Instrument Maturity Date, End 2027-06  
Unsecured Senior Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate 3.375% 3.375%
Unsecured Senior Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate 4.70% 4.70%
Mortgage indebtedness-Fixed Rate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount $ 95,200 $ 89,000
Mortgage, Weighted Average Interest Rate 5.70% 5.90%
Debt Instrument Maturity Date, Start 2020-04  
Debt Instrument Maturity Date, End 2025-05  
Mortgages indebtedness [Member]    
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (300) $ (300)
Mortgage indebtedness 94,900 88,700
Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 100,000 50,000
Net unamortized debt issuance costs (500) (300)
Total Term Loan $ 99,500 $ 49,700
Term Loan interest rates 2.80% 3.90%
Debt Instrument Maturity Date 2023-01