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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized discount and debt issuance costs | $ (14,962) | $ (4,689)
Long-term debt | 425,199 | 409,399
Less current portion of long-term debt | 12,518 | 9,146
Long-term debt due after one year, net | 412,681 | 400,253
6.00% 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 | 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 | 7,165 | 8,167
5.25% Secured Promissory Note Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt carrying amount | 8,090 | 11,262
6.76% Secured Promissory Note Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Debt carrying amount | 14,685 | 16,665
Other [Member] |  |
Debt Instrument [Line Items] |  |
Debt carrying amount | $ 221 | $ 2,994

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