Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 17, 2013
Stockholders Equity Note [Line Items]
Preference stock, maximum shares authorized to be issued	20,000,000
Preference stock, par value	$ 0.01
Preference stock, shares outstanding	0
Preferred stock, maximum shares authorized to be issued	3,000,000
Preferred stock, par value	$ 1.00
Preferred stock, shares outstanding	0
Shares of common stock repurchased	4,900,000	11,000,000	2,300,000
Purchase of treasury stock	$ 177,162,000	$ 469,218,000	$ 77,946,000
Authorized increase to share repurchase program				500,000,000
Remaining share repurchase authorizations under share repurchase program	203,000,000
Dividends paid per share of common stock	$ 1.52	$ 1.44	$ 1.24
Currency translation adjustments	$ (189,666,000)	$ (29,694,000)	$ 27,616,000