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 6 Months Ended
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class Of Stock [Line Items]                
Partnership distributions, amount         $ 2,693 $ 3,040 $ 4,642 $ 4,415
Distributions of partner incentive allocations of net income             $ 21,177 $ 18,827
Class B Common Stock                
Class Of Stock [Line Items]                
Share conversion, Shares             (28,000) (38,000)
Common stock issued 13,468 948         13,000  
Class B Common Stock | Resale And Registration Rights Agreement                
Class Of Stock [Line Items]                
Share conversion, Shares   2,000   26,008        
Class A Common Stock                
Class Of Stock [Line Items]                
Share conversion, Shares             28,000 38,000
Common stock issued   3,896 1,000          
Silvercrest L.P                
Class Of Stock [Line Items]                
Accrued partner incentive allocations         $ 5,827 $ 4,607 $ 11,478 $ 9,028