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Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Mar. 03, 2015
Debt Instrument [Line Items]      
Total debt $ 896,366 $ 817,024  
Less deferred financing costs (15,995) (16,309)  
Total long-term debt 880,371 800,715  
3.75% Convertible Senior Notes [Member]      
Debt Instrument [Line Items]      
Convertible Notes 301,517 292,024 $ 261,900
12.500% Senior Secured Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes $ 594,849 $ 525,000