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

Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

Debt - Additional Information (Detail)							1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
Debt - Additional Information (Detail)	Aug. 01, 2017 USD ($)	Aug. 02, 2016 USD ($)	Aug. 01, 2015 USD ($)	Nov. 01, 2014 USD ($)	Jun. 24, 2013 USD ($) Installment	Jun. 03, 2013 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Installment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Oct. 31, 2014 USD ($)
Debt Instrument [Line Items]
Interest expense including amortization of deferred financing fees										$ 17,000	$ 47,000	$ 85,000	$ 174,000
Promissory Note
Debt Instrument [Line Items]
Variable rate notes issued for redemption of partners' interests, spread						1.00%
Debt instrument variable interest rate basis												The principal amount outstanding under these notes bears interest at the U.S. Prime Rate plus 1% in effect at the time payments are due.
Aggregate principal amount						$ 5,300,000
Debt instrument reduction to principal amount																$ 1,722,000
Principal amount of notes										3,578,000		$ 3,578,000
Principal amount payment terms												As a result, the principal amounts of the notes of $3,578 became payable in four equal installments of approximately $900 on November 1, 2014, and on each of August 1, 2015, 2016 and 2017.
Number of installments \| Installment												4
Installment amount payable	$ 900,000	$ 900,000	$ 900,000	$ 900,000
Principal amount of notes outstanding										0		$ 0		$ 895,000
Accrued, unpaid interest												$ 0		17,000
Promissory Note \| Jamison
Debt Instrument [Line Items]
Variable rate notes issued for redemption of partners' interests, spread												5.00%
Debt instrument variable interest rate basis												The principal amount outstanding under the notes bears interest at 5% per annum.
Aggregate principal amount															$ 2,165,000
Principal amount payment terms												The principal amounts of the notes are payable in three equal installments of approximately $722 on each of June 30, 2016, 2017 and 2018.
Number of installments \| Installment												3
Installment amount payable								$ 722,000	$ 722,000
Principal amount of notes outstanding										722,000		$ 722,000		1,443,000
Accrued, unpaid interest												9,000		18,000
Promissory Note \| Scenario Forecast \| Jamison
Debt Instrument [Line Items]
Installment amount payable							$ 722,000
City National Bank
Debt Instrument [Line Items]
Credit facility, borrowing capacity					$ 15,000,000
Borrowings under revolving credit facility										0		0		$ 0
Interest expense including amortization of deferred financing fees										$ 4,000	$ 12,000	$ 12,000	$ 35,000
Delayed Draw Term Loan \| City National Bank
Debt Instrument [Line Items]
Credit facility, borrowing capacity					$ 7,500,000
Credit facility maturity date												Jun. 24, 2020
Credit facility, interest rate description												The higher of the prime rate plus a margin of 0.05 percentage points and 2.5% or (b) the LIBOR rate plus 3 percentage points, at the borrowers' option
Variable rate notes issued for redemption of partners' interests, spread					3.00%
Debt instrument variable interest rate basis												LIBOR
Credit facility, number of installments \| Installment					20
Credit facility, frequency of installments												Quarterly
Delayed Draw Term Loan \| City National Bank \| Maximum
Debt Instrument [Line Items]
Variable rate notes issued for redemption of partners' interests, spread					0.05%
Debt instrument variable interest rate basis												Prime rate
Delayed Draw Term Loan \| City National Bank \| Minimum
Debt Instrument [Line Items]
Credit facility, fixed interest rate					2.50%
Borrowings Under Revolving Credit Agreement \| City National Bank
Debt Instrument [Line Items]
Credit facility, borrowing capacity					$ 7,500,000
Credit facility maturity date												Dec. 24, 2016
Debt covenant, restriction on change in control					30.00%