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Stock-based Compensation - Additional Information (Detail) (USD $) | 6 Months Ended | 1 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 Employee Stock Option | Jun. 30, 2013 Acquired to satisfy the exercise price Employee Stock Option | Jun. 30, 2013 Acquired to satisfy payroll tax withholding obligations Employee Stock Option | Jun. 30, 2013 Performance Unit Awards 2010 | Apr. 30, 2013 Performance Unit Awards 2010 Scenario, Forecast
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |
Treasury stock shares acquired |  | 637,624 |  |  |  |
Treasury stock acquisition price | $ 22,358,000 |  | $ 12,300,000 | $ 2,900,000 |  |
Performance period |  |  |  |  | 3 years |
Award description |  |  |  |  | Generally, the recipients will receive a target number of shares if the Company's total shareholder return is positive and, when compared to the peer group, is at the 50thpercentile and two times the target if at the 75thpercentile or higher. |
Target number of shares |  |  |  |  | 178,750 |
Shares issued |  |  |  |  |  | 357,500

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + 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 (a) -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 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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