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Long-Term Debt - Summary of Long-Term Debt Instruments and Balances Outstanding (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]      
Securitization notes $ 181,000 $ 227,288 $ 217,125
Subtotal 806,000 874,288 768,169
Less: Long-term debt issuance costs (14,092) (16,359) (13,519)
Total long-term debt [1] 791,908 857,929 754,650
Revolving Line of Credit      
Debt Instrument [Line Items]      
Revolving line of credit   22,000 8,000
9.75% Senior Notes Due 2021      
Debt Instrument [Line Items]      
Senior notes     293,044
8.50% Senior Notes Due 2024      
Debt Instrument [Line Items]      
Senior notes 250,000 250,000 $ 250,000
8.50% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Senior notes $ 375,000 $ 375,000  
[1] Includes amounts in wholly owned, bankruptcy-remote special purpose subsidiaries (“VIEs”) presented separately in the table below.