Discontinued Operations - Assets and Liabilities of Discontinued Operations on Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disposal Group Including Discontinued Operation Balance Sheet Disclosures [Abstract]
Receivables, net	$ 171	$ 382
Total current assets	171	382
Deferred income tax assets, net	1,585	1,585
Total assets of discontinued operations	1,756	1,967
Accounts payable and accrued expenses	16	185
Remaining lease obligations	3,109	5,516
Total current liabilities	3,125	5,701
Remaining lease obligations		785
Total liabilities of discontinued operations	$ 3,125	$ 6,486