Quarterly report pursuant to Section 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, 2014
Dec. 31, 2013
Sep. 30, 2013
Jul. 12, 2013
Dec. 31, 2012
Common shares          
Common stock, shares outstanding           
Preferred shares          
Preferred stock, shares authorized 10,000,000        
Preferred stock, shares outstanding 0 0      
Class A Common Stock
          
Common shares          
Common stock, shares authorized 50,000,000 50,000,000      
Common stock, shares outstanding 7,658,010 7,522,974 5,509,000 5,509,297   
Common stock, voting rights 1 vote per share        
Class B Common Stock
          
Common shares          
Common stock, shares authorized 25,000,000 25,000,000      
Common stock, shares outstanding 4,570,413 4,464,617 6,462,000     
Common stock, voting rights 1 vote per share