Annual report pursuant to Section 13 and 15(d)

Class A Common Shares Reserved for Future Issuance (Detail)

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Class A Common Shares Reserved for Future Issuance (Detail) (Class A Common Stock)
Dec. 31, 2012
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