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 9 Months Ended
Aug. 31, 2015
Jun. 30, 2015
May. 31, 2015
Mar. 31, 2015
Feb. 28, 2015
Sep. 30, 2015
Sep. 30, 2014
Class Of Stock [Line Items]              
Stock issued upon vesting of deferred equity units, transaction date         Feb. 28, 2015    
Common stock conversion date Aug. 31, 2015   May 31, 2015 Mar. 31, 2015      
Common stock issuance date   Jun. 30, 2015          
Balance, Shares           4,520,413 4,465,000
Class B common stock issued upon vesting of deferred equity units         126,616    
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock           134,000 136,000
Balance, Shares           4,772,130 4,570,000
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 (65,477)   (50,000) (18,000)      
Jamison              
Class Of Stock [Line Items]              
Class B common stock issued upon vesting of deferred equity units   258,578