Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Defined Contribution and Deferred Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Contribution Plan Disclosure [Line Items]        
Silvercrest matching contributions towards benefit of employees $ 26 $ 27 $ 80 $ 71
Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Silvercrest matching contribution percentage     4.00%