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Treasury Stock and Share Based Awards - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Stockholders Equity Note [Line Items] |  |
Intrinsic value of options exercised | $ 168 |
Average remaining contractual life of options outstanding | 1 year |
Tax benefit recognized on stock option exercised | 71 |
Total fair value of vested shares | 13,440 |
Tax benefit recognized on vested shares | 4,268 |
Restricted Stock |  |
Stockholders Equity Note [Line Items] |  |
Shares of Restricted Stock Granted | 220,526 |
Market value of common stock on the date of grant | $ 29.28 |
Minimum forfeiture rate for restricted stock awards | 0.00% |
Maximum forfeiture rate for restricted stock awards | 5.00% |
Compensation expense | 7,823 | 8,004
Unrecognized compensation expense | 16,850 |
Weighted average period over which remaining compensation expense will be recognized (in years) | 2 years |
Shares of restricted stock, forfeited | 21,847 |
Restricted stock awards vested | 461,060 |
Restricted Stock | Director |  |
Stockholders Equity Note [Line Items] |  |
Award vesting period for restricted stock granted | 1 year |
Restricted Stock | Employee Scenario One |  |
Stockholders Equity Note [Line Items] |  |
Award vesting period for restricted stock granted | 3 years |
Restricted Stock | Employee Scenario Two |  |
Stockholders Equity Note [Line Items] |  |
Award vesting period for restricted stock granted | 4 years |
Restricted Stock | Minimum |  |
Stockholders Equity Note [Line Items] |  |
Market value of common stock on the date of grant | $ 27.92 |
Restricted Stock | Maximum |  |
Stockholders Equity Note [Line Items] |  |
Market value of common stock on the date of grant | $ 29.44 |
Restricted Stock Units (RSUs) |  |
Stockholders Equity Note [Line Items] |  |
Market value of common stock on the date of grant | $ 29.44 |
Unrecognized compensation expense | 4,602 |
Weighted average period over which remaining compensation expense will be recognized (in years) | 1 year |
Number of hypothetical shares of common stock issued to employees | 115,107 |
Percentage of IRR, which is the threshold | 8.50% |
Percentage of IRR, which is the target | 10.50% |
Percentage of IRR, which is the maximum | 12.50% |
Percentage of restricted stock units vest | 100.00% |
Expected forfeiture rate | 5.00% |
Shares of restricted stock, forfeited | 11,498 |
Compensation expense | 2,523 | 2,161
Restricted stock awards vested | 295,751 |
Restricted stock unit conversion into share of common stock, conversion ratio | 1 |
Dividends paid on vested restricted stock units | 939 |
Total fair value of shares vested during the period | 8,723 |
Recognized tax benefits related to shares vested during the period | $ 3,663 |
Number of hypothetical shares of common stock | 802,529 |
Actual cumulative forfeitures (in units) | 11,498 |

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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 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 + Details
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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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