Quarterly report pursuant to sections 13 or 15(d)

Stockholders' Equity - Summary of Authorized and Outstanding Equity (Detail)

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Stockholders' Equity - Summary of Authorized and Outstanding Equity (Detail)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Preferred shares        
Preferred Stock, shares authorized 10,000,000      
Preferred Stock, shares outstanding 0      
Class A Common Stock
        
Common shares        
Common stock, shares authorized 50,000,000      
Common stock, shares outstanding 5,509,297 0 0 0
Common stock voting rights 1 vote per share      
Class B Common Stock
        
Common shares        
Common stock, shares authorized 25,000,000      
Common stock, shares outstanding 6,461,764 0 0 0
Common stock voting rights 1 vote per share