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) - shares
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Preferred shares        
Preferred stock, shares authorized 10,000,000 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 7,912,633 7,768,010 7,658,000 7,523,000
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 4,772,130 4,520,413 4,570,000 4,465,000
Common stock, voting rights 1 vote per share