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Fair Value of Financial Assets and Liabilities - Summary of Fair Value and Carrying Value of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Secured Notes $ 891,732 $ 817,024
Convertible Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Convertible Notes 301,000 275,000
Carrying Value of Convertible Notes 296,705 292,024
Senior Secured Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Long Term Debt 668,000 572,000
Senior Secured Notes $ 595,027 $ 525,000