Annual report pursuant to section 13 and 15(d)

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

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Stockholders' Equity - Summary of Authorized and Outstanding Equity (Detail)
 12 Months Ended
Dec. 31, 2013
Jul. 12, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Common shares          
Common stock, shares outstanding             
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 7,522,974 5,509,297         
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 4,464,617           
Common stock voting rights 1 vote per share