Stockholders' Equity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 vote	Dec. 31, 2013	Dec. 31, 2012	Feb. 04, 2014
Equity [Abstract]
Common stock par value (in Dollars per share)	$ 0.0005	$ 0.0005
Common stock, number of votes per share	1
Payments for purchases of treasury stock	$ 432,006,000	$ 181,736,000	$ 111,304,000
Stock repurchase program, authorized amount	500,000,000.0			800,000,000.0
Stock repurchase program, remaining authorized amount	413,300,000
Cost of repurchased stock	$ 419,712,000	$ 196,696,000	$ 111,304,000