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

Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

Commitments and Contingencies - Additional Information (Detail) - USD ($)								1 Months Ended											3 Months Ended		9 Months Ended
	Aug. 20, 2020	Jun. 01, 2020	May 01, 2020	Jun. 06, 2019	Apr. 12, 2019	Dec. 13, 2018	Jan. 16, 2018	Aug. 31, 2019	Jul. 31, 2019	Mar. 31, 2019	Jan. 31, 2018	Jul. 31, 2017	Jan. 31, 2017	Sep. 30, 2016	Jan. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2014	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Commitments And Contingencies [Line Items]
Operating lease rent expense																			$ 1,597,000	$ 1,566,000	$ 4,777,000	$ 4,625,000
Sub-lease income																			38,000	28,000	115,000	98,000
Finance lease obligation																			289,000		289,000		$ 196,000
Assets acquired under capital leases																			284,000		284,000		198,000
Depreciation expense																			279,000	267,000	838,000	815,000
Leased assets write off																			209,000	310,000	209,000	310,000
Accumulated depreciation																			9,911,000		9,911,000		8,811,000
Two Copiers \| Lease Agreement July 31, 2022
Commitments And Contingencies [Line Items]
Lease expiration date								Jul. 31, 2022
Assets acquired under capital leases								$ 51,000
Capital lease, period								3 years
Capital lease, minimum monthly payment								$ 1,000
Copier \| Through May Thirty First Two Thousand And Twenty Two
Commitments And Contingencies [Line Items]
Lease expiration date										May 31, 2022
Assets acquired under capital leases										$ 12,000
Capital lease, period										39 months
Capital lease, minimum monthly payment										$ 400
Copier \| Through February 28,2022
Commitments And Contingencies [Line Items]
Lease expiration date										Feb. 28, 2021
Assets acquired under capital leases										$ 11,000
Capital lease, period										3 years
Capital lease, minimum monthly payment										$ 300
Copier \| Through May 31, 2022
Commitments And Contingencies [Line Items]
Lease expiration date										Feb. 28, 2022
Assets acquired under capital leases										$ 13,000
Capital lease, period										3 years
Capital lease, minimum monthly payment										$ 400
Finance Lease Assets
Commitments And Contingencies [Line Items]
Depreciation expense																			26,000	25,000	88,000	78,000
Leased Assets
Commitments And Contingencies [Line Items]
Accumulated depreciation																			180,000	310,000	180,000	310,000
Cortina Asset Management, LLC \| Copier \| Lease Agreement November 2021
Commitments And Contingencies [Line Items]
Lease expiration date									Nov. 30, 2021
Capital lease, minimum monthly payment									$ 1,000
Additional Office Space
Commitments And Contingencies [Line Items]
Operating lease rent expense, net														$ 10,000				$ 5,000
Refundable security deposit																		$ 3,000
Lease commencement date							Jan. 16, 2018							Oct. 01, 2017				May 01, 2014
Lease expiration date							Nov. 30, 2028							Nov. 30, 2024				Jul. 31, 2019
Number of rent free periods																		3 months
Rent credit														$ 40,000
Lease expansion date							Jan. 12, 2018
Office Space \| Charlottesville, VA.
Commitments And Contingencies [Line Items]
Operating lease rent expense, net																	$ 2,000
Refundable security deposit																	$ 2,000
Lease commencement date				Jul. 01, 2019													Jun. 30, 2015
Lease expiration date				Jun. 30, 2022													Jun. 30, 2019
Lease extended period				3 years
Office Space \| Bedminster, NJ.
Commitments And Contingencies [Line Items]
Operating lease rent expense, net																	$ 11,000
Lease expiration date																	Mar. 31, 2022
Number of rent free periods																	4 months
Office Space \| Princeton, NJ.
Commitments And Contingencies [Line Items]
Operating lease rent expense, net															$ 6,000		$ 5,000
Lease expiration date															Aug. 31, 2022		Apr. 30, 2016
Number of rent free periods															5 months
Office Space \| New York City
Commitments And Contingencies [Line Items]
Operating lease rent expense, net																$ 446,000
Lease commencement date																Oct. 01, 2017
Lease expiration date																Sep. 30, 2028
Number of rent free periods																12 months
Payments for tenant improvements																$ 2,080,000
Office Space \| Livingston, NJ
Commitments And Contingencies [Line Items]
Operating lease rent expense, net															$ 2,000
Lease expiration date															Jan. 31, 2019
Office Space \| Boston, MA
Commitments And Contingencies [Line Items]
Operating lease rent expense, net											$ 33,000
Lease commencement date											Jan. 01, 2018
Lease expiration date											Apr. 30, 2023
Number of rent free periods											1 month
Office Space \| La Jolla, CA
Commitments And Contingencies [Line Items]
Operating lease rent expense, net						$ 3,000
Lease expiration date						Jan. 31, 2020
Office Space \| San Diego, CA
Commitments And Contingencies [Line Items]
Operating lease rent expense, net						$ 12,000
Lease commencement date						Feb. 01, 2020
Lease expiration date						Jun. 30, 2025
Number of rent free periods						4 months
Payments for tenant improvements						$ 27,000
Office Space \| Milwaukee, WI
Commitments And Contingencies [Line Items]
Operating lease rent expense, net					$ 12,000
Lease expiration date					Dec. 31, 2022
Office Equipment
Commitments And Contingencies [Line Items]
Finance lease obligation																			289,000		289,000		196,000
Office Equipment \| Two Copiers
Commitments And Contingencies [Line Items]
Lease expiration date													Jan. 31, 2022
Assets acquired under capital leases													$ 152,000
Capital lease, period													5 years
Capital lease, minimum monthly payment													$ 3,000
Office Equipment \| Two Copiers \| Through August 19, 2023
Commitments And Contingencies [Line Items]
Lease expiration date	Aug. 19, 2023
Assets acquired under capital leases	$ 43,000
Capital lease, period	3 years
Capital lease, minimum monthly payment	$ 1,000
Office Equipment \| Two Copiers \| Through August 19, 2023
Commitments And Contingencies [Line Items]
Lease expiration date	Aug. 19, 2023
Assets acquired under capital leases	$ 39,000
Capital lease, period	3 years
Capital lease, minimum monthly payment	$ 1,000
Office Equipment \| Copier \| Through April 30, 2025
Commitments And Contingencies [Line Items]
Lease expiration date			Apr. 30, 2025
Assets acquired under capital leases			$ 82,000
Capital lease, period			5 years
Capital lease, minimum monthly payment			$ 1,000
Office Equipment \| Copier \| Through May 31, 2023
Commitments And Contingencies [Line Items]
Lease expiration date		May 31, 2023
Assets acquired under capital leases		$ 59,000
Capital lease, period		3 years
Capital lease, minimum monthly payment		$ 2,000
Office Equipment \| Four Copiers
Commitments And Contingencies [Line Items]
Lease expiration date												Jun. 30, 2020
Assets acquired under capital leases												$ 72,000
Capital lease, period												3 years
Capital lease, minimum monthly payment												$ 2,000
Letter of Credit
Commitments And Contingencies [Line Items]
Refundable security deposit																			506,000		506,000		$ 506,000
Letter of Credit \| Boston landlord
Commitments And Contingencies [Line Items]
Refundable security deposit																			80,000		80,000
General and administrative
Commitments And Contingencies [Line Items]
Operating lease rent expense, net																			$ 1,559,000	$ 1,538,000	$ 4,662,000	$ 4,527,000