Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Class B Common Stock (Detail)

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Stockholders' Equity - Class B Common Stock (Detail) - Class B Common Stock - shares
1 Months Ended 3 Months Ended
Mar. 31, 2016
Feb. 29, 2016
Mar. 31, 2016
Mar. 31, 2015
Class Of Stock [Line Items]        
Stock issued upon vesting of deferred equity units, transaction date   Feb. 29, 2016    
Common stock conversion date Mar. 31, 2016      
Balance, Shares     4,695,014 4,520,000
Class B common stock issued upon vesting of deferred equity units   4,911    
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock     38,000 18,000
Balance, Shares 4,661,849   4,661,849 4,629,000
Resale And Registration Rights Agreement        
Class Of Stock [Line Items]        
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock (38,076)