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 ($)						1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 01, 2019	Apr. 12, 2019	Dec. 13, 2018	Dec. 15, 2015	Mar. 30, 2015	May 31, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Class B Common Stock
Business Acquisition [Line Items]
Issuance of Class B shares, Shares						948	2,000	6,000
Cortina Asset Management, LLC \| Purchase Agreement
Business Acquisition [Line Items]
Percentage to acquire business in cash		80.00%
Additional percentage to acquire business in cash		80.00%
Cortina Asset Management, LLC \| Purchase Agreement \| Subsequent Event
Business Acquisition [Line Items]
Aggregate purchase amount	$ 33,577
Additional percentage to acquire business in cash	80.00%
Cortina Asset Management, LLC \| Purchase Agreement \| Maximum
Business Acquisition [Line Items]
Aggregate purchase amount		$ 44,937,000
Additional aggregate purchase amount		$ 26,209,000
Cortina Asset Management, LLC \| Purchase Agreement \| Maximum \| Subsequent Event
Business Acquisition [Line Items]
Additional aggregate purchase amount	$ 26,209
Cortina Asset Management, LLC \| Purchase Agreement \| SLP
Business Acquisition [Line Items]
Percentage of business combination consideration issuance		20.00%
Additional percentage of earn out payment paid in cash		20.00%
Potential earn-out payments period		4 years
Cortina Asset Management, LLC \| Purchase Agreement \| SLP \| Subsequent Event
Business Acquisition [Line Items]
Additional aggregate purchase amount	$ 8,952
Additional percentage of earn out payment paid in cash	20.00%
Potential earn-out payments period	4 years
Cortina Asset Management, LLC \| Purchase Agreement \| SLP \| Class B Common Stock \| Subsequent Event
Business Acquisition [Line Items]
Issuance of Class B shares, Shares	662,713
Neosho
Business Acquisition [Line Items]
Cash paid on date of acquisition			$ 399,000						$ 399,000
Equity consideration for SLP acquired			20,000						1,686,000
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%
Cappiccille
Business Acquisition [Line Items]
Equity consideration for SLP acquired									126,000	$ 231,000
Contingent consideration				$ 354,000
Cash paid on date of acquisition				$ 148,000
Earn out payments percentage on revenue remainder of fiscal year				19.00%
Earn out payments percentage on revenue due in two years				19.00%
Earn out payments percentage on revenue due in three years				19.00%
Earn out payments percentage on revenue due in four years				19.00%
Earn out payments percentage on revenue due thereafter				19.00%
Jamison
Business Acquisition [Line Items]
Equity consideration for SLP acquired					$ 3,562,000
Contingent consideration					1,429,000				$ 204,000	$ 524,000
Cash paid on date of acquisition					$ 3,550,000
Earn out payments percentage on EBITDA remainder of fiscal year					20.00%
Earn out payments percentage on EBITDA due in two years					20.00%
Earn out payments percentage on EBITDA due in three years					20.00%
Earn out payments percentage on EBITDA due in four years					20.00%
Earn out payments percentage on EBITDA due in five years					20.00%
Earn Out Payments Percentage On EBITDA Due thereafter					20.00%
Jamison \| Seller Note
Business Acquisition [Line Items]
Promissory note issued					$ 394,000
Interest on principal amount					5.00%
Jamison \| Principals Notes
Business Acquisition [Line Items]
Promissory note issued					$ 1,771,000
Interest on principal amount					5.00%