Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unamortized discount, net of premium and debt issuance costs	$ (10,420)	$ (12,261)
Long-term debt	499,044	459,044
Less current portion of long-term debt	11,492	9,410
Long-term debt due after one year, net	487,552	449,634
4.00% Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Debt carrying amount	30,000
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	3,007	4,746
1.00% Unsecured Loan Agreement due 2022 [Member]
Debt Instrument [Line Items]
Debt carrying amount	10,000
4.43% Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	11,715	12,705
8.32% Secured Financing Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	12,120	13,476
8.75% Secured Loan Agreement Due 2025 [Member]
Debt Instrument [Line Items]
Debt carrying amount	7,481	5,219
Other [Member]
Debt Instrument [Line Items]
Debt carrying amount	$ 141	$ 159

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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