Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Mar. 03, 2015
Debt Instrument [Line Items]
Total debt	$ 1,026,268	$ 1,017,064
Less deferred financing costs	(14,113)	(16,196)
Total long-term debt	1,012,155	1,000,868
3.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	322,136	311,544	$ 261,900
12.500% Senior Secured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Senior Secured Notes	$ 704,132	$ 705,520

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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