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Long-Term Debt - Long-term Debt (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Debt issuance costs, net of amortization $ (23,506)
Long-term Debt 1,242,844
Bank Credit Facility  
Debt Instrument [Line Items]  
Principal 450,000
9¾% Senior Notes due 2026  
Debt Instrument [Line Items]  
Principal 850,000
Discount, net of amortization $ (33,650)