Annual report pursuant to Section 13 and 15(d)

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

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Defined Contribution and Deferred Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]      
Silvercrest matching contributions towards benefit of employees $ 87 $ 86 $ 75
Defined contribution plan, plan name 401(k) savings plan    
Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Silvercrest matching contribution percentage 4.00%