Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.4.0.3
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2016
Feb. 29, 2016
Mar. 31, 2016
Mar. 31, 2015
Class Of Stock [Line Items]        
Partnership distributions, amount     $ 1,375 $ 1,241
Distributions of partner incentive allocations of net income     $ 18,827 $ 18,568
Class B Common Stock        
Class Of Stock [Line Items]        
Common stock issued   4,911    
Exchange of Class B common stock for Class A common stock     (38,000) (18,000)
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     $ 4,422 $ 4,241