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Treasury Stock and Share Based Awards - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 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 | 234,813 |
Market value of common stock on the date of grant | $ 28.54 |
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 | 17,466 |
Recognized tax benefits related to shares vested during the period | 6,645 |
Compensation expense | 2,616 | 2,588
Unrecognized compensation expense | 18,397 |
Compensation expense recognition period (in years) | 2 years |
Restricted stock awards vested | 586,955 |
Restricted Stock | Employee Scenario One |  |
Stockholders Equity Note [Line Items] |  |
Award vesting period for restricted stock granted | 2 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] |  |
Market value of common stock on the date of grant | $ 28.54 |
Total fair value of shares vested during the period | 11,194 |
Recognized tax benefits related to shares vested during the period | 4,751 |
Compensation expense | 907 | 862
Unrecognized compensation expense | $ 6,777 |
Compensation expense recognition period (in years) | 2 years |
Number of hypothetical shares of common stock | 607,806 |
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 awards vested | 392,238 |
Restricted stock unit conversion into share of common stock, conversion ratio | 1 |
Actual cumulative forfeitures (in units) | 11,498 |
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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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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