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Common Stock and Treasury Stock - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 96 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Sep. 21, 2012 | Feb. 29, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | Jul. 31, 2013 | Feb. 24, 2014 Subsequent Event | Dec. 31, 2013 Restricted share awards (RSAs) | Dec. 31, 2012 Restricted share awards (RSAs) | Dec. 31, 2011 Restricted share awards (RSAs) | Dec. 31, 2013 Long-term incentive program performance share awards | Sep. 13, 2012 Maximum | Dec. 31, 2013 Maximum
Maximum stock authorized to purchase under stock repurchase program |  | $ 262,100,000 |  |  | $ 210,000,000 |  |  |  |  |  |  |  | $ 113,000,000 |
Increase in maximum stock authorized to purchase under stock repurchase program |  | 52,100,000 |  |  |  |  | 100,000,000 | 100,000,000 |  |  |  |  |  |
Stock authorized to purchase under stock repurchase program, shares |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |
Cash settlement of common stock warrants | 29,600,000 |  |  | 29,596,000 |  |  |  |  |  |  |  |  |  |
Common stock warrants repurchased | 2,492,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares |  |  | 1,656,808 | 1,437,692 |  | 11,176,680 |  |  |  |  |  |  |  |
Repurchase of common stock, value |  |  | 80,912,000 | 57,836,000 |  | 325,800,000 |  |  |  |  |  |  |  |
Remaining value of shares authorized for purchase under the stock repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 109,700,000
Number shares issued pursuant to stock option exercises |  |  | 826,061 | 847,301 | 361,093 |  |  |  |  |  |  |  |  |
Number shares issued pursuant to restricted share award grants |  |  |  |  |  |  |  |  | 8,663 | 56,389 | 6,300 |  |  |
Stock issued during the period restricted share awards |  |  |  |  |  |  |  |  | 8,663 |  |  |  |  |
Stock issued during the period performance share award |  |  |  |  |  |  |  |  |  |  |  | 327,576 |  |

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