Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax [Line Items]
Income tax expense	$ 4,254	$ 2,913	$ 4,026	$ 2,972
Effective income tax rate			42.10%	41.30%
Loss on liquidation of foreign subsidiary			$ 300
U.S. State [Member]
Income Tax [Line Items]
Audit expense					$ 200