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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
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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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