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Stock Benefit Plans - Additional Information (Detail) | Dec. 31, 2012
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2010 Incentive Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Reserved shares | 7,066,233
Shares available for issuance | 4,271,047
Directors' Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Reserved shares | 1,170,000
Shares available for issuance | 763,873

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- Definition Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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