Annual report pursuant to Section 13 and 15(d)

Equity - Additional Information (Detail)

v3.3.1.900
Equity - Additional Information (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Equity [Line Items]    
Ownership percentage of common stock shares outstanding of chairman 74.00%  
Class B Common Stock Converted Into Class A Common Stock    
Equity [Line Items]    
Stock conversion ratio 1  
Class A Common Stock    
Equity [Line Items]    
Common stock, shares outstanding 19,130,681 19,084,958
Class A Common Stock | Board of Directors Chairman    
Equity [Line Items]    
Common stock, shares outstanding 348,682  
Class B Common Stock    
Equity [Line Items]    
Common stock, shares outstanding 5,400,000 5,400,000
Class B Common Stock | Board of Directors Chairman    
Equity [Line Items]    
Ownership percentage of common stock shares outstanding of chairman 100.00%  
Common stock, shares outstanding 5,400,000