Share Repurchase Program - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jul. 31, 2013 Rule 10b-18	Jan. 31, 2012 Rule 10b-18
Equity, Class of Treasury Stock [Line Items]
Common stock shares, remaining authorized	991,529			1,966,700
Common stock, additional number of shares authorized to repurchase			2,000,000
Purchase of Treasury Stock, shares	235,619	128,960
Purchase of Treasury Stock, per share value	$ 17.51	$ 15.52
Purchase of Treasury Stock	$ 4,127	$ 2,002