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Common Stock and Treasury Stock - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 84 Months Ended | 1 Months Ended | 12 Months Ended
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Sep. 21, 2012 | Sep. 13, 2012 | Feb. 29, 2012 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2012 Maximum | Dec. 31, 2012 Restricted share awards (RSAs) | Dec. 31, 2011 Restricted share awards (RSAs) | Dec. 31, 2010 Restricted share awards (RSAs)
Maximum stock authorized to purchase under stock repurchase program |  | $ 113,000,000 | $ 262,100,000 |  |  | $ 210,000,000 |  |  |  |  |  |
Increase in maximum stock authorized to purchase under stock repurchase program |  |  | 52,100,000 |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares |  |  |  |  | 1,437,692 |  |  | 9,519,872 |  |  |  |
Repurchase of common stock, value |  |  |  |  | 57,836,000 |  |  | 244,900,000 |  |  |  |
Stock authorized to purchase under stock repurchase program, shares |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Cash settlement of common stock warrants | 5,600,000 |  |  | 29,600,000 | 29,596,000 |  |  |  |  |  |  |
Common stock warrants repurchased | 2,492,600 |  |  |  |  |  |  |  |  |  |  |
Remaining value of shares authorized for purchase under the stock repurchase program |  |  |  |  |  |  |  |  | $ 78,900,000 |  |  |
Remaining authorized shares for repurchase under the stock repurchase program |  |  |  |  |  |  |  |  | 1,800,000 |  |  |
Number shares issued pursuant to stock option exercises |  |  |  |  | 847,301 | 361,093 | 235,986 |  |  |  |  |
Number shares issued pursuant to restricted share award grants |  |  |  |  |  |  |  |  |  | 56,389 | 6,300 | 25,950
Stock issued during the period restricted share awards |  |  |  |  |  |  |  |  |  | 226,594 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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