Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Excess tax benefit (shortfall) from exercise of stock options	$ (292,000)	$ 1,822,000	$ 1,329,000
Undistributed earnings of foreign subsidiaries	$ 1,900,000	1,600,000
Likelihood percentage of being realized upon ultimate settlement with the relevant tax authority	50.00%
Unrecognized tax benefits	$ 0	0
Changes in unrecognized benefits	0	$ 0	$ 0
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Company's foreign net operating losses for tax purposes	$ 1,800,000
Foreign net operating loss carry forwards, expiration date	2023