Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized discount, net of premium and debt issuance costs	$ (13,172)	$ (14,962)
Long-term debt	456,753	425,199
Less current portion of long-term debt	9,090	12,518
Long-term debt due after one year, net	447,663	412,681
5.5% 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	5,599	8,090
6.35% Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	13,200	14,685
8.32% Secured Financing Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	14,128
Secured Promissory Note Due 2019 [Member]
Debt Instrument [Line Items]
Debt carrying amount		7,165
Other [Member]
Debt Instrument [Line Items]
Debt carrying amount	$ 1,998	$ 221

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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