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Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Revolving credit facility 1 $ 170,000 $ 35,000
Long-term debt 0 1,085,429
Debt Instrument, Unamortized Discount (20,617) (24,571)
Long-term Debt 1,245,000 1,110,000
Long-term Debt, Current Maturities (1,224,383) 0
7.25% Senior Notes due 2019    
Debt Instrument [Line Items]    
Senior notes 300,000 300,000
Debt Instrument, Unamortized Discount (3,295) (4,131)
8.50% Senior Notes due 2020    
Debt Instrument [Line Items]    
Senior notes 775,000 775,000
Debt Instrument, Unamortized Discount $ (17,322) $ (20,440)