Net Income Per Share - Basic and Diluted Earnings per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Weighted average number of shares of common stock outstanding-basic	60,523	60,724	60,372	60,550
Dilutive common stock equivalents relating to options and restricted stock	2,887	1,712	3,143	1,391
Weighted average number of shares of common stock outstanding-diluted	63,410	62,436	63,515	61,941