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Earnings Per Share - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended		1 Months Ended
	May 07, 2013	Jun. 30, 2013	Jun. 30, 2012	Feb. 12, 2013	Jun. 30, 2013 Common Stock	Jun. 30, 2013 Common Stock	Jun. 30, 2013 J P Morgan Securities LLC Accelerated Share Repurchase Agreement	May 10, 2013 J P Morgan Securities LLC Accelerated Share Repurchase Agreement Initial Delivery	May 10, 2013 J P Morgan Securities LLC Accelerated Share Repurchase Agreement Fair Market Value	Jun. 30, 2013 J P Morgan Securities LLC Accelerated Share Repurchase Agreement Final Settlement	Feb. 12, 2013 Maximum	Jul. 10, 2013 Subsequent Event
Earnings Per Share Disclosure [Line Items]
Increase in dividend rate, percentage				20.00%
Cash dividend, amount per share	$ 0.24			$ 0.24								$ 0.24
Cash dividend, declared date	May 07, 2013											Jul. 10, 2013
Cash dividend, payable date	Jul. 01, 2013											Oct. 01, 2013
Cash dividend, recorded date	Jun. 14, 2013											Sep. 13, 2013
Stock repurchase program, number of shares authorized to be repurchased											15,000,000
Agreement Entry Date							May 09, 2013
Payment for repurchase of common stock		$ 582,298,000	$ 13,695,000					$ 450,000,000
Repurchase of common stock shares								5,680,921		1,400,000
Shares repurchased									360,000,000
Forward Purchase Prices adjustment amount							$ 1.01
Shares repurchased (in shares)					6,800,395	7,814,045
Shares available for repurchase		7,185,955

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