Share Repurchase Program - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Class of Stock Disclosures [Abstract]
Purchase of Treasury Stock, shares	0	158,570	180,013	428,590
Purchase of Treasury Stock, per share value		$ 17.74	$ 18.98	$ 19.03
Purchase of Treasury Stock		$ 2,813	$ 3,417	$ 8,156
Common stock shares, available for repurchase	311,056		311,056