Capital Stock - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended
	Feb. 08, 2013	Nov. 19, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders Equity Note [Line Items]
Common stock, shares authorized			200,000,000	200,000,000
Common Stock, par value			$ 0.01	$ 0.01
Preferred stock, shares authorized			10,000,000
Preferred stock, par value			$ 0.01
Common stock authorized for repurchase		$ 100,000,000			$ 300,000,000.0
Repurchases of common stock			354,154	805,346	441,416
Common stock repurchased, purchase price per share			$ 46.90	$ 42.33	$ 35.77
Common stock repurchased, total purchase price			267,607,000	34,109,000	15,797,000
Common stock purchased through modified dutch auction tender offer - in shares	5,524,861
Common stock purchased through modified dutch auction tender offer - price per share	$ 45.25
Common stock purchased through modified dutch auction tender offer - total purchase price in dollars	250,000,000
Fees And Expenses Incurred Related To Modified Dutch Auction Tender Offer	1,000,000
Treasury Stock, Value, Acquired, Cost Method			267,607,000	34,109,000	15,797,000
Common stock repurchase, remaining authorized amount			83,500,000
Treasury shares issued			149,304	132,846	374,071
Average cost for restricted stock units			$ 6.63	$ 6.63	$ 6.63
Shares repurchased to satisfy employee withholding tax requirements resulting from certain restricted stock units becoming vested			58,812	43,874	142,080
Common stock repurchased, average cost			$ 43.55	$ 42.64	$ 36.58
Treasury stock, shares			24,140,804	18,352,281
Stock Repurchase Progam for 2013 [Member]
Stockholders Equity Note [Line Items]
Common stock repurchased, total purchase price			16,600,000
Board of Directors Co-Chairman [Member] | Stock Repurchase Program for 2012 [Member]
Stockholders Equity Note [Line Items]
Repurchases of common stock	515,806
Treasury Stock Acquired, Average Cost Per Share	$ 45.25
Treasury Stock, Value, Acquired, Cost Method	$ 23,300,000