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Senior Notes and Unsecured Revolving Credit Facility - Schedule of Senior Notes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Discount and deferred loan costs $ (21,091) $ (28,698)
Long-term Debt 1,410,804 1,471,302
Senior Notes [Member] | 4.375% Senior notes due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross 381,895 450,000
Senior Notes [Member] | 4.875% Senior Notes due July 1, 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross 300,000 300,000
Senior Notes [Member] | 5.875% Senior notes due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross 450,000 450,000
Senior Notes [Member] | 5.250% Senior Notes due June 1, 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 300,000 $ 300,000