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Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (10,295)  
Total Senior Notes 1,646,007 $ 2,810,100
Total Unsecured Term Loan 49,655 398,130
Mortgage indebtedness 88,743 641,082
Unsecured Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount 1,660,000 2,832,200
Senior notes – discount, net (4,300) (5,100)
Net unamortized debt issuance costs (9,700) (17,000)
Total Senior Notes $ 1,646,000 $ 2,810,100
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% 7.50%
Mortgage indebtedness-Fixed Rate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount $ 89,000 $ 643,400
Mortgage, Weighted Average Interest Rate 5.90% 4.70%
Debt Instrument Maturity Date, Start 2020-04  
Debt Instrument Maturity Date, End 2022-01  
Mortgages indebtedness [Member]    
Debt Instrument [Line Items]    
Net unamortized debt issuance costs $ (300) $ (2,300)
Mortgage indebtedness 88,700 641,100
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 50,000 400,000
Net unamortized debt issuance costs (300) (1,900)
Total Unsecured Term Loan $ 49,700 $ 398,100
Term Loan interest rates 3.90% 2.90%
Debt Instrument Maturity Date 2023-01