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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, 2014 | Sep. 30, 2013
Stockholders Equity Note [Line Items] |  |
Number of stock options exercised | 14,584 |
Weighted average exercise price of options exercised | $ 7.63 |
Intrinsic value of options exercised | $ 296 |
Tax benefit recognized on stock option exercised | 124 |
Stock options outstanding | 0 |
Restricted Stock |  |
Stockholders Equity Note [Line Items] |  |
Shares of Restricted Stock Granted | 268,257 |
Weighted average market value of common stock on the date of grant | $ 28.90 |
Minimum forfeiture rate for restricted stock awards | 0.00% |
Maximum forfeiture rate for restricted stock awards | 5.00% |
Total fair value of shares vested during the period | 18,571 |
Recognized tax benefits related to shares vested during the period | 7,109 |
Compensation expense | 7,264 | 7,823
Unrecognized compensation expense | 14,589 |
Compensation expense recognition period (in years) | 2 years |
Restricted stock unit awards vested | 619,307 |
Restricted Stock | Minimum |  |
Stockholders Equity Note [Line Items] |  |
Weighted average market value of common stock on the date of grant | $ 28.54 |
Restricted Stock | Maximum |  |
Stockholders Equity Note [Line Items] |  |
Weighted average market value of common stock on the date of grant | $ 35.49 |
Restricted Stock | Board of Directors |  |
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 Units (RSUs) |  |
Stockholders Equity Note [Line Items] |  |
Weighted average market value of common stock on the date of grant | $ 28.54 |
Total fair value of shares vested during the period | 11,312 |
Recognized tax benefits related to shares vested during the period | 4,751 |
Compensation expense | 2,300 | 2,523
Unrecognized compensation expense | 5,383 |
Compensation expense recognition period (in years) | 2 years |
Number of hypothetical shares of common stock | 577,097 |
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% |
Restricted stock unit awards vested | 392,238 |
Restricted stock unit conversion into share of common stock, conversion ratio | 1 |
Dividends paid on vested restricted stock units | $ 1,341 |
Restricted Stock Units (RSUs) | Minimum |  |
Stockholders Equity Note [Line Items] |  |
Expected forfeiture rate | 0.00% |
Restricted Stock Units (RSUs) | Maximum |  |
Stockholders Equity Note [Line Items] |  |
Expected forfeiture rate | 5.00% |
Restricted Stock Units (RSUs) | Employee |  |
Stockholders Equity Note [Line Items] |  |
Number of hypothetical shares of common stock | 197,515 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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