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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Unamortized discount, net of premium and debt issuance costs $ (14,038) $ (14,962)
Long-term debt 456,836 425,199
Less current portion of long-term debt 8,672 12,518
Long-term debt due after one year, net 448,164 412,681
6.0% Working Capital Revolver Loan [Member]    
Debt Instrument [Line Items]    
Debt carrying amount   10,000
Senior Secured Notes Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 435,000 400,000
5.25% Secured Promissory Note Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 6,440 8,090
6.69% Secured Promissory Note Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 13,695 14,685
8.32% Secured Financing Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount 14,767  
Secured Promissory Note Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt carrying amount   7,165
Other [Member]    
Debt Instrument [Line Items]    
Debt carrying amount $ 972 $ 221