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Stock Based Compensation Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 Restricted Stock | Sep. 30, 2013 Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of stock for tax withholding |  |  | 336,000 | 51,079
Vesting of restricted shares |  |  | 1,050,000 | 183,750
Minimum withholding tax on restricted stocks | $ 1,639 | $ 24 | $ 1,600 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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