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Senior Notes and Loans Payable - Schedule of Senior Notes (Detail) - Senior Notes - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Discount and deferred loan costs $ (19,422) $ (21,091)
Total 1,412,463 1,410,804
4.375% Senior notes due June 15, 2019    
Debt Instrument [Line Items]    
Senior notes (gross) 381,885 381,895
4.875% Senior notes due July 1, 2021    
Debt Instrument [Line Items]    
Senior notes (gross) 300,000 300,000
5.875% Senior notes due June 15, 2024    
Debt Instrument [Line Items]    
Senior notes (gross) 450,000 450,000
5.250% Senior notes due June 1, 2027    
Debt Instrument [Line Items]    
Senior notes (gross) $ 300,000 $ 300,000