Quarterly report pursuant to Section 13 or 15(d)

Defined Contribution and Deferred Compensation Plans - Additional Information (Detail)

v3.10.0.1
Defined Contribution and Deferred Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Contribution Plan Disclosure [Line Items]        
Silvercrest matching contributions towards benefit of employees $ 19 $ 26 $ 56 $ 80
Defined contribution plan, plan name     401(k) savings plan  
Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Silvercrest matching contribution percentage     4.00%