Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Deferred gains on sale/leaseback transactions	$ 2,890	$ 5,416
Net operating loss carryforward (expiring up to 2037)	25,441	23,206
Compensation costs	2,245	3,707
Depreciation and amortization	4,367
Other	2,099	3,221
Total deferred tax assets	37,042	35,550
Deferred tax asset valuation allowance	(36,737)	(30,821)
Total deferred tax assets, net	305	4,729
Deferred tax liabilities:
Depreciation and amortization	(2,246)	(4,729)
Total deferred tax liabilities	(2,246)	$ (4,729)
Net deferred tax (liabilities) assets	$ (1,941)