Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.5.0.2
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Class Of Stock [Line Items]              
Partnership distributions, amount       $ 3,040 $ 2,883 $ 4,415 $ 4,125
Distributions of partner incentive allocations of net income           $ 18,827 $ 18,568
Class B Common Stock              
Class Of Stock [Line Items]              
Common stock issued 9,198   4,911        
Exchange of Class B common stock for Class A common stock           (38,000) (68,000)
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   38,076          
Silvercrest L.P              
Class Of Stock [Line Items]              
Accrued partner incentive allocations       $ 4,607 $ 4,860 $ 9,028 $ 9,101