Income Taxes - Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred
U.S.	$ (218)	$ (5,863)	$ (5,536)
State	(36)	691	(1,049)
Foreign	326	6	261
Total deferred income tax expense	72	(5,166)	(6,324)
Total income tax expense (benefit)	78	(5,160)	(7,048)
U.S.			(204)
State			(357)
Foreign	6	6	(163)
Total current income tax expense (benefit)	$ 6	$ 6	$ (724)