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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs $ (15,822) $ (4,689)
Long-term debt 415,673 409,399
Less current portion of long-term debt, net 12,698 9,146
Long-term debt due after one year, net 402,975 400,253
Senior Secured Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 400,000  
Senior Secured Notes due 2019 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount   375,000
5.73% Secured Promissory Note Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 7,416 8,167
5.25% Secured Promissory Note Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 8,899 11,262
6.35% Secured Promissory Note Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount $ 15,180 16,665
Other [Member]    
Debt Instrument [Line Items]    
Debt carrying amount   $ 2,994