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Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Mar. 03, 2015
Debt Instrument [Line Items]      
Total debt $ 812,468 $ 576,031  
Less deferred financing costs (16,267) (14,623)  
Less current portion of long-term debt   (18,835)  
Total long-term debt 796,201 542,573  
Amended and Restated Senior Term Facility [Member]      
Debt Instrument [Line Items]      
Total debt   301,503  
3.75% Convertible Senior Notes [Member]      
Debt Instrument [Line Items]      
Convertible Notes 287,468 $ 274,528 $ 261,900
12.500% Senior Secured Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes $ 525,000