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Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Mar. 03, 2015
Debt Instrument [Line Items]
Total debt	$ 1,119,713	$ 1,041,948
Less deferred financing costs	(27,392)	(17,055)
Total long-term debt	1,092,321	1,024,893
2024 Senior Secured Notes [Member]
Debt Instrument [Line Items]
Senior Secured Notes	920,800
Total debt	920,800
2022 Senior Secured Notes [Member]
Debt Instrument [Line Items]
Senior Secured Notes		702,670
2022 Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	195,867	190,083
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	$ 3,046	$ 149,195	$ 261,900