Defined Contribution and Deferred Compensation Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Contribution Plan Disclosure [Line Items]
Silvercrest matching contributions towards benefit of employees	$ 22	$ 19	$ 44	$ 38
Defined contribution plan, plan name			401(k) savings plan
Maximum
Defined Contribution Plan Disclosure [Line Items]
Silvercrest matching contribution percentage			4.00%