Silvercrest Asset Management Group LLC Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

Acquisitions - Additional Information (Detail) - USD ($)					3 Months Ended		9 Months Ended
	Jul. 30, 2021	Jul. 01, 2019	Apr. 12, 2019	Dec. 13, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Contingent purchase price payment							$ 3,045,000	$ 741,000
Cortina Asset Management, LLC
Business Acquisition [Line Items]
Equity consideration for SLP acquired					$ 16,300,000		16,300,000			$ 15,100,000
Fair value adjustments to contingent purchase price consideration					670,000	$ 1,700,000	4,570,000	(500,000)
Cortina Asset Management, LLC \| General, Administrative and Other
Business Acquisition [Line Items]
Costs related to acquisition						$ 5,000		90,000
Cortina Asset Management, LLC \| Purchase Agreement
Business Acquisition [Line Items]
Aggregate purchase amount		$ 33,577,000
Percentage to acquire business in cash			80.00%
Additional percentage to acquire business in cash		80.00%	80.00%
Business combination consideration partially offset by net closing credits		$ 35,072,000
Equity consideration for SLP acquired		13,800,000
Business combination acquired revenue			$ 13,027,000
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Greater than or Equal to 95% for July 1, 2020 to June 30, 2021
Business Acquisition [Line Items]
Business combination contingent consideration first retention payment			3,370,000
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Equal to 75% or Less for July 1, 2020 to June 30, 2021
Business Acquisition [Line Items]
Business combination contingent consideration first retention payment			0
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Between 75% and 95% for July 1, 2020 to June 30, 2021
Business Acquisition [Line Items]
Business combination contingent consideration first retention payment, minimum			0
Business combination contingent consideration first retention payment, maximum			3,370,000
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Exceeded 95% for July 1, 2020 to June 30, 2021
Business Acquisition [Line Items]
Business combination contingent consideration first retention payment									$ 3,370,000
Business combination contingent consideration first retention payment paid in cash	$ 2,696,000
Business combination contingent consideration first retention payment paid in equity	$ 674,000
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Between 85% and 105% for July 1, 2021 to June 30, 2022
Business Acquisition [Line Items]
Business combination contingent consideration second retention payment, minimum			0
Business combination contingent consideration second retention payment, maximum			5,617,000
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Equal to 85% or Less for July 1, 2021 to June 30, 2022
Business Acquisition [Line Items]
Business combination contingent consideration second retention payment			0
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Between 95% and 140% for July 1, 2022 to June 30, 2023
Business Acquisition [Line Items]
Business combination contingent consideration growth payment, minimum			0
Business combination contingent consideration growth payment, maximum			17,222,000
Cortina Asset Management, LLC \| Purchase Agreement \| Revenue Equal to 95% or Less for July 1, 2022 to June 30, 2023
Business Acquisition [Line Items]
Business combination contingent consideration growth payment			0
Cortina Asset Management, LLC \| Purchase Agreement \| Maximum
Business Acquisition [Line Items]
Aggregate purchase amount			44,937,000
Additional aggregate purchase amount		26,209,000	26,209,000
Cortina Asset Management, LLC \| Purchase Agreement \| Maximum \| Revenue Between 85% and 105% for July 1, 2021 to June 30, 2022
Business Acquisition [Line Items]
Business combination contingent consideration second retention payment			5,617,000
Cortina Asset Management, LLC \| Purchase Agreement \| Maximum \| Revenue Between 95% and 140% for July 1, 2022 to June 30, 2023
Business Acquisition [Line Items]
Business combination contingent consideration growth payment			$ 17,222,000
Cortina Asset Management, LLC \| Purchase Agreement \| SLP
Business Acquisition [Line Items]
Percentage of business combination consideration issuance			20.00%
Additional aggregate purchase amount		$ 8,952,000
Additional percentage of earn out payment paid in cash		20.00%	20.00%
Potential earn-out payments period		4 years	4 years
Issuance of Class B units		662,713
Neosho
Business Acquisition [Line Items]
Equity consideration for SLP acquired				$ 20,000	$ 928,000		928,000			$ 1,028,000
Cash paid on date of acquisition				399,000
Contingent consideration				1,686,000
Expected payments on first anniversary of closing date				300,000
Earn out payments due in two years				100,000
Earn out payments due in three years				100,000
Earn out payments due in four years				100,000
Earn out payments due in five years				$ 100,000
Percentage of product to obtain earn out payment				50.00%
Percentage of earn out payment paid in cash				75.00%
Percentage of earn out payment paid in equity				25.00%
Contingent purchase price payment							$ 100,000	$ 300,000