Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 4,431,000	$ 4,254,000	$ 5,526,000	$ 4,026,000
Effective income tax rate			38.70%	42.10%
Effective income tax rate, nondeductible loss on liquidation of foreign subsidiary			$ 0	$ 300,000