Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Weighted average shares used in basic computations	81,927	102,200	87,754	103,096
Dilutive effect of exercise of equity grants outstanding	4,274	5,577	4,865	4,663
Weighted average shares used in diluted computations	86,201	107,777	92,619	107,759