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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, 2020
Dec. 31, 2019
Mar. 03, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total debt $ 1,147,315 $ 1,125,503  
2024 Senior Secured Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value of Long Term Debt [1] 989,000 982,000  
Total debt [2] 921,672 921,137  
2022 Convertible Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value of Convertible Notes [1] 379,000 297,000  
Carrying Value of Convertible Notes [3] $ 211,643 201,868  
2020 Convertible Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value of Convertible Notes [1]   2,498  
Carrying Value of Convertible Notes   $ 2,498 $ 261,900
[1]

Fair value amounts are rounded to the nearest million, except for the 2020 Convertible Notes, as of December 31, 2019.

[2]

Carrying value of the 2024 Senior Secured Notes reflects the unaccreted debt discount of $3.3 million and $3.9 million, respectively, as of September 30, 2020 and December 31, 2019. See Note 11, “Long-Term Debt and Other Liabilities,” for further information.

[3]

Carrying value of the 2022 Convertible Notes reflects the unaccreted debt discount of $26.1 million and $35.9 million, respectively, as of September 30, 2020 and December 31, 2019. See Note 11, “Long-Term Debt and Other Liabilities,” for further information.