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Class A Common Shares Reserved for Future Issuance (Detail) (Class A Common Stock) | Dec. 31, 2012
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Class of Stock [Line Items] |
Total shares reserved for future issuance | 6,806,450
Stock Options |
Class of Stock [Line Items] |
Total shares reserved for future issuance | 1,406,450
Class B Common Stock Converted Into Class A Common Stock |
Class of Stock [Line Items] |
Total shares reserved for future issuance | 5,400,000

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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