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Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 03, 2015
Debt Instrument [Line Items]      
Total debt $ 1,021,603 $ 1,017,064  
Less deferred financing costs (15,161) (16,196)  
Total long-term debt 1,006,442 1,000,868  
3.75% Convertible Senior Notes [Member]      
Debt Instrument [Line Items]      
Convertible Notes 316,768 311,544 $ 261,900
12.500% Senior Secured Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes $ 704,835 $ 705,520