Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ (14,158)	$ (14,962)
Long-term debt	425,188	425,199
Less current portion of long-term debt, net	12,275	12,518
Long-term debt due after one year, net	412,913	412,681
6.0% Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Debt carrying amount	10,000	10,000
Senior Secured Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	400,000	400,000
5.73% Secured Promissory Note Due 2019 [Member]
Debt Instrument [Line Items]
Debt carrying amount	6,906	7,165
5.25% Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Debt carrying amount	7,269	8,090
6.74% Secured Promissory Note Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	14,190	14,685
Other [Member]
Debt Instrument [Line Items]
Debt carrying amount	$ 981	$ 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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