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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
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt $ 1,012,739 $ 817,024
Convertible Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Convertible Notes 333,000 275,000
Carrying Value of Convertible Notes 306,462 292,024
Senior Secured Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Long Term Debt 788,000 572,000
Total debt $ 706,277 $ 525,000