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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized discount, net of premium and debt issuance costs	$ (7,729)	$ (8,648)
Long-term debt	481,755	484,190
Less current portion of long-term debt	18,082	16,801
Long-term debt due after one year, net	463,673	467,389
Senior Secured Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	435,000	435,000
1.00% Unsecured Loan Agreement due 2022 [Member]
Debt Instrument [Line Items]
Debt carrying amount	10,000	10,000
8.32% Secured Financing Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	9,985	10,715
8.75% Secured Loan Agreement Due 2025 [Member]
Debt Instrument [Line Items]
Debt carrying amount	6,497	6,834
8.75% Secured Financing Due 2025 [Member]
Debt Instrument [Line Items]
Debt carrying amount	27,593	28,636
Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Debt carrying amount		1,221
Other [Member]
Debt Instrument [Line Items]
Debt carrying amount	$ 409	$ 432

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- Definition

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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-SubTopic 20
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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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