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

Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Detail)

Equity - Additional Information (Detail) - USD ($)	1 Months Ended							3 Months Ended						9 Months Ended
Equity - Additional Information (Detail) - USD ($)	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Mar. 31, 2021	Jan. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Jul. 29, 2021
Class Of Stock [Line Items]
Partnership distributions, amount								$ 1,471,000			$ 1,497,000			$ 6,821,000	$ 6,521,000
Distributions of partner incentive allocations of net income														$ 27,819,000	27,236,000
Treasury stock, aggregate price								$ 418,000
Class B Common Stock
Class Of Stock [Line Items]
Share conversion, Shares								(11,000)	(11,000)	(8,000)	(24,000)	(12,000)	(176,000)
Issuance of common stock							34,196	44,000	2,000	56,000
Class B Common Stock \| Neosho
Class Of Stock [Line Items]
Issuance of common stock in connection with acquisition				1,740
Class B Common Stock \| Cortina Asset Management, LLC
Class Of Stock [Line Items]
Issuance of common stock in connection with acquisition			44,267
Class B Common Stock \| Restricted Stock
Class Of Stock [Line Items]
Issuance of common stock					20,876		21,598
Class B Common Stock \| Resale And Registration Rights Agreement
Class Of Stock [Line Items]
Share conversion, Shares		10,651		5,864	4,743	7,605
Class B Common Stock \| Silvercrest L.P
Class Of Stock [Line Items]
Issuance of common stock							34,196
Class A Common Stock
Class Of Stock [Line Items]
Share conversion, Shares								11,000	11,000	8,000	24,000	12,000	176,000
Issuance of common stock					856
Treasury stock, purchased	27,197							27,000						27,197
Treasury stock, aggregate price														$ 418,000
Class A Common Stock \| Maximum
Class Of Stock [Line Items]
Stock repurchase program, authorized amount																$ 15,000,000
Class A Common Stock \| Restricted Stock
Class Of Stock [Line Items]
Issuance of common stock					856
Silvercrest L.P
Class Of Stock [Line Items]
Accrued partner incentive allocations								$ 9,196,000			$ 7,121,000			$ 26,210,000	$ 20,055,000