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]
Provision for income tax	$ 1,778	$ 3,309	$ 2,742	$ 4,488
Income tax effective rate			(298.70%)	77.30%
Income tax effective rate excluding the impact of discrete charges			(256.60%)	63.20%
Gross unrecognized tax benefit	15,600		$ 15,600		$ 15,600
Accrued interest and penalties related to unrecognized tax benefits	$ 500		$ 500		$ 500