Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets
Accruals and reserves not currently deductible	$ 6,631	$ 7,084
Federal NOL and interest expense limitation carryovers	13,796	286
State NOL and interest expense limitation carryovers	1,106	39
Accrued and deferred compensation	2,888	2,809
Prepaid items	1,198	2,432
Lease liability	4,052
Contract liability	2,543	3,242
Residual value guarantee settlement		2,568
Other	1,010	849
Subtotal before valuation allowance	33,224	19,309
Less: valuation allowance	(6,330)	(457)
Total Deferred Tax Assets	26,894	18,852
Deferred Tax Liabilities
Property and equipment	(24,696)	(20,701)
Right-of-use asset	(4,791)
Other	(6)	(6)
Total Deferred Tax Liabilities	(29,493)	(20,707)
Net Deferred Income Tax Liabilities	$ (2,599)	$ (1,855)