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 6 Months Ended
May 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 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      
Common stock issuance date May 31, 2016        
Balance, Shares       4,695,014 4,520,000
Class B common stock issued 9,198   4,911    
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock       38,000 68,000
Balance, Shares       4,671,047 4,838,000
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)