Stockholders' Equity (Additional Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Aug. 31, 2013
Stockholders Equity Note [Line Items]
Treasury Stock, Shares, Acquired	575,472
Treasury Stock Value Acquired Cost Method	$ 14,915
Repurchase Program
Stockholders Equity Note [Line Items]
Share Repurchase Program Shares Authorized To Acquire Outstanding Common Stock Percentage		5.00%
Repurchase of outstanding shares of common stock under Stock Repurchase Program		1,300,000
Treasury Stock, Shares, Acquired	575,472
Stock Repurchased, Average Cost Per Share	$ 25.92