Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 830,000	$ 1,254,000	$ 2,072,000
Additions based on tax provisions related to the current year	125,000	120,000	161,000
Reductions for tax positions of prior years			(967,000)
Settlements		(480,000)
Lapse of statute	(9,000)	(64,000)	(12,000)
Unrecognized tax benefits, Ending Balance	$ 946,000	$ 830,000	$ 1,254,000