Shareholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended				12 Months Ended			64 Months Ended		1 Months Ended
	Dec. 31, 2013 Vote	Dec. 31, 2012	Dec. 31, 2011	Feb. 13, 2002 Series A Preferred Stock	Dec. 31, 2013 Stock Repurchase Program	Dec. 31, 2012 Stock Repurchase Program	Dec. 31, 2011 Stock Repurchase Program	Dec. 31, 2013 Stock Repurchase Program	Aug. 28, 2008 Stock Repurchase Program Maximum	Jan. 21, 2014 Subsequent Event Dividend Declared	Feb. 28, 2014 Subsequent Event Stock Repurchase Program
Stockholders Equity Note [Line Items]
Common stock votes per share	1
Dividends declared per common share										$ 0.30
Cash dividend, date dividend paid										Feb. 18, 2014
Cash dividend, record date										Feb. 03, 2014
Preferred stock, shares authorized	5,000	5,000		2,000
Shareholder rights plan, expiration period	2012-02
Board of Directors authorized the repurchase of common stock									2,000,000
Repurchased and retired, shares					75,000	60,000	55,000	1,952,576			36,969
Repurchased and retired, aggregate price	$ 5,834	$ 5,727	$ 6,649		$ 5,833	$ 5,727	$ 6,649	$ 84,134			$ 4,062