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Earnings Per Share - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Common Stock | Dec. 31, 2012 Common Stock | Dec. 31, 2011 Common Stock | Feb. 12, 2013 Maximum | Oct. 13, 2011 Maximum | Dec. 31, 2013 Accelerated Share Repurchase Agreement Jp Morgan | May 10, 2013 Total Accelerated Share Repurchase Agreement Jp Morgan | Dec. 31, 2013 Total Accelerated Share Repurchase Agreement Jp Morgan | May 10, 2013 Fair Value Accelerated Share Repurchase Agreement Jp Morgan | Dec. 19, 2013 Final Accelerated Share Repurchase Agreement Jp Morgan | Feb. 03, 2014 Subsequent Event Accelerated Share Repurchase Agreement Merrill Lynch tranche | Feb. 03, 2014 Subsequent Event Total Accelerated Share Repurchase Agreement Merrill Lynch | Feb. 03, 2014 Subsequent Event Fair Value Accelerated Share Repurchase Agreement Merrill Lynch | Dec. 31, 2013 Restricted Stock
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents not included in computation of diluted earnings per share (in dollars per shares) | 468,120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares containing nonforfeitable rights to dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,133
Preferred stock, shares authorized (in shares) | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 15,000,000 | 5,000,000 |  |  |  |  |  | 1,500,000 |  |  |
Repurchases of common stock | $ 582,298,000 | $ 63,575,000 | $ 178,132,000 |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  | $ 50,000,000 |  |
Repurchase of common stock shares (in shares) |  |  |  |  |  |  |  |  |  | 5,680,921 | 7,064,932 |  | 1,384,011 |  | 623,248 |  |
Stock repurchased during period |  |  |  |  |  |  |  |  |  |  |  | 360,000,000 |  |  |  | 40,000,000 |
Forward purchase contract adjustment to fair value (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.01 |  |  |  |  | $ 0.77 |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 |  |  |
Shares repurchased (in shares) |  |  |  | 9,198,056 | 1,092,767 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares available for repurchase | 5,939,594 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
Number of tranches |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Share repurchase amount per tranche |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |

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