Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unamortized discount, net of premium and debt issuance costs	$ (8,648)	$ (12,261)
Long-term debt	484,190	459,044
Less current portion of long-term debt	16,801	9,410
Long-term debt due after one year, net	467,389	449,634
Senior Secured Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	435,000	435,000
5.25% Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Debt carrying amount	1,221	4,746
1.00% Unsecured Loan Agreement due 2022 [Member]
Debt Instrument [Line Items]
Debt carrying amount	10,000
8.32% Secured Financing Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	10,715	13,476
8.75% Secured Loan Agreement Due 2025 [Member]
Debt Instrument [Line Items]
Debt carrying amount	6,834	5,219
8.75% Secured Financing Due 2025 [Member]
Debt Instrument [Line Items]
Debt carrying amount	28,636
Other [Member]
Debt Instrument [Line Items]
Debt carrying amount	$ 432	159
Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount		$ 12,705

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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