Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Detail)

v3.7.0.1
Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Class Of Stock [Line Items]      
Partnership distributions, amount   $ 1,949 $ 1,375
Distributions of partner incentive allocations of net income   $ 21,177 $ 18,827
Class B Common Stock      
Class Of Stock [Line Items]      
Exchange of Class B common stock for Class A common stock   (26,000) (38,000)
Class B Common Stock | Resale And Registration Rights Agreement      
Class Of Stock [Line Items]      
Exchange of Class B common stock for Class A common stock 26,008    
Silvercrest L.P      
Class Of Stock [Line Items]      
Accrued partner incentive allocations   $ 5,651 $ 4,422