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
	Jun. 30, 2015	Sep. 30, 2017	Jul. 31, 2017	Jan. 31, 2017	Sep. 30, 2016	Jan. 31, 2016	Dec. 31, 2015	Oct. 31, 2015	Jul. 31, 2015	Jun. 30, 2015	Mar. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Commitments And Contingencies [Line Items]
Operating lease rent expense												$ 996,000	$ 910,000	$ 2,908,000	$ 2,797,000
Sub-lease income												68,000	64,000	202,000	225,000
Assets acquired under capital leases														241,000
Depreciation expense												247,000	184,000	681,000	553,000
Capital Lease Assets
Commitments And Contingencies [Line Items]
Depreciation expense												36,000	31,000	110,000	93,000
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					Oct. 01, 2017						May 01, 2014
Lease expires					Nov. 30, 2024						Jul. 31, 2019
Number of rent free periods											3 months
Rent credit					$ 40,000,000								40,000,000		40,000,000
Office Space \| Charlottesville, VA.
Commitments And Contingencies [Line Items]
Operating lease rent expense, net										$ 2,000
Refundable security deposit	$ 2,000									$ 2,000
Lease commencement date										Jun. 30, 2015
Lease expires										Jun. 30, 2018
Number of rent free periods										2 months
Office Space \| Bedminster, NJ.
Commitments And Contingencies [Line Items]
Operating lease rent expense, net														$ 11,000
Lease expires														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 expires						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 expires							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
Office Space \| Boston, MA
Commitments And Contingencies [Line Items]
Operating lease rent expense, net		$ 35,000
Lease commencement date		Jan. 01, 2018
Lease expires		Oct. 31, 2018
Number of rent free periods		1 month
Office Equipment
Commitments And Contingencies [Line Items]
Capital lease obligation		$ 344,000										344,000		$ 344,000		$ 267,000
Office Equipment \| Telephone System
Commitments And Contingencies [Line Items]
Lease expires														Nov. 30, 2018
Assets acquired under capital leases														$ 321,000
Capital lease, period														5 years
Capital lease, minimum monthly payment														$ 5,000
Office Equipment \| Copier
Commitments And Contingencies [Line Items]
Lease expires				Dec. 31, 2018				Oct. 31, 2018	Jun. 30, 2018
Assets acquired under capital leases				$ 11,000				$ 18,000	$ 21,000
Capital lease, period				2 years				3 years	3 years
Capital lease, minimum monthly payment				$ 1,000				$ 1,000	$ 1,000
Office Equipment \| Two Copiers
Commitments And Contingencies [Line Items]
Lease expires				Jan. 31, 2022
Assets acquired under capital leases				$ 152,000
Capital lease, period				5 years
Capital lease, minimum monthly payment				$ 3,000
Office Equipment \| Four Copiers
Commitments And Contingencies [Line Items]
Lease expires			Jun. 30, 2020
Assets acquired under capital leases			$ 72,000
Capital lease, period			3 years
Capital lease, minimum monthly payment			$ 2,000
Office Equipment \| Jamison
Commitments And Contingencies [Line Items]
Assets acquired under capital leases	$ 253,000
Letter of Credit
Commitments And Contingencies [Line Items]
Refundable security deposit		506,000										506,000		506,000		$ 506,000
Letter of Credit \| Boston landlord
Commitments And Contingencies [Line Items]
Refundable security deposit		$ 80,000										80,000		80,000
General and administrative
Commitments And Contingencies [Line Items]
Operating lease rent expense, net												$ 928,000	$ 846,000	$ 2,706,000	$ 2,572,000