Stockholders' Equity - Summary of Authorized and Outstanding Equity (Parenthetical) (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 12, 2013
Class Of Stock [Line Items]        
Preferred stock, par value $ 0.01 $ 0.01    
Class A Common Stock        
Class Of Stock [Line Items]        
Common stock, par value $ 0.01 $ 0.01    
Common stock, voting rights 1 vote per share      
Common stockholders rights percentage 100.00%      
Common stock, shares outstanding 7,989,749 7,768,010 7,522,000 5,509,297
Class B Common Stock        
Class Of Stock [Line Items]        
Common stock, par value $ 0.01 $ 0.01    
Common stock, voting rights 1 vote per share      
Class of share exchangeable to another class One share of Class A common stock      
Common stock, shares outstanding 4,695,014 4,520,413 4,465,000  
Deferred equity units exercisable 4,911      
Restricted stock units granted 966,510