Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Defined Contribution and Deferred Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan name 401(k) savings plan    
Defined Contribution Plan, Tax Status [Extensible List] us-gaap:QualifiedPlanMember    
Silvercrest matching contributions towards benefit of employees $ 160 $ 87 $ 86
Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Silvercrest matching contribution percentage 4.00%