Stockholders Equity - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2012	Jun. 30, 2006	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shareholders Equity [Line Items]
Preferred stock, shares authorized			1,000,000	1,000,000
Common stock, shares authorized			100,000,000	70,000,000
Common stock, par value			$ 0.01	$ 0.01
Common stock, shares issued			37,945,000	37,712,000
Common stock, shares outstanding			37,945,000	37,712,000
Aggregate amount of stock repurchases authorized			$ 92,400,000
Cash dividends declared, per share		$ 0.03	$ 0.12	$ 0.12	$ 0.12
Cash dividends paid			(4,548,000)	(4,510,000)	(4,454,000)
Exercise of warrants	2,464
Common Stock Shares with held in connection with exercise of warrants			78
Value of common Stock Shares with held			$ 2,094
Number of common stock issued in connection with exercise of warrants			2,386