Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 7,008	$ 5,531	$ 12,903	$ 11,744
Effective tax rates (as a percent)	30.00%	31.40%	29.90%	35.20%
Income tax reconciliation, reversal of non-taxable earn-out liability	$ 3,810		$ (4,060)
Reversal of unrecognized tax benefit			0	$ 1,818
Unrecognized tax benefits	2,761		2,761		$ 2,797
Recognized interest and penalties	49	$ 52
Accrued interest on unrecognized tax benefits	$ 1,346		$ 1,346		$ 1,269