Share Repurchase Program - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Class of Stock Disclosures [Abstract]
Purchase of Treasury Stock, shares	180,013	93,903
Purchase of Treasury Stock, per share value	$ 18.98	$ 20.41
Purchase of Treasury Stock	$ 3,417	$ 1,917
Common stock shares, available for repurchase	311,056