Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Detail)

v3.8.0.1
Equity - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2018
Jan. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Class Of Stock [Line Items]        
Partnership distributions, amount     $ 2,072 $ 1,949
Distributions of partner incentive allocations of net income     $ 24,935 $ 21,177
Class B Common Stock        
Class Of Stock [Line Items]        
Share conversion, Shares     (117,000) (26,000)
Class B Common Stock | Resale And Registration Rights Agreement        
Class Of Stock [Line Items]        
Share conversion, Shares 85,286 31,650    
Silvercrest L.P        
Class Of Stock [Line Items]        
Accrued partner incentive allocations     $ 6,763 $ 5,651