Equity (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014		May. 05, 2015
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount								$ 1,200,000,000.0
Treasury stock, average price paid per share (in Dollars per share)		$ 84.03	$ 69.59	$ 82.34		$ 70.07
Purchases of treasury stock	$ 2,700,000	$ 117,400,000	$ 111,598,000	$ 441,442,000	[1]	$ 307,448,000	[1]

[1] The cash paid for the six months ended June 30, 2015 includes $2.7 million for share repurchase transactions that occurred in late December 2014 and were paid in early January 2015.