Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision
Federal			$ 2
State	$ 54	$ 27	34
Deferred provision (benefit)
Federal	(9,830)	1,187	2,018
Tax benefit of equity adjustment for stock option exercises and restricted stock vesting			(1,231)
Valuation allowance	9,830	(1,187)	21,686
Total income tax expense	$ 54	$ 27	$ 22,509