Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Total deferred tax valuation allowance					$ 150,400
(Benefit from) provision for income taxes	$ (747)	$ 1,854	$ (958)	$ 2,074
Effective tax rate	(7.30%)	15.90%	(2.70%)	6.30%
Cumulative effect of federal and state valuation losses			37.10%
Decrease in unrecognized tax positions	$ 1,800		$ 1,800
Possible interest and accrued penalties	$ 2,500		$ 2,500