Subsequent Events - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
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Jul. 01, 2019 |
Jun. 20, 2019 |
Apr. 12, 2019 |
Jun. 24, 2013 |
May 31, 2019 |
Mar. 31, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Dec. 31, 2018 |
| Class B Common Stock |
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| Subsequent Event [Line Items] |
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| Issuance of Class B shares, Shares |
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948
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2,000
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6,000
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| Purchase Agreement | Cortina Asset Management, LLC |
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| Subsequent Event [Line Items] |
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| Additional percentage to acquire business in cash |
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80.00%
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| Purchase Agreement | Cortina Asset Management, LLC | Silvercrest L.P |
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| Subsequent Event [Line Items] |
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| Additional percentage of earn out payment paid in cash |
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20.00%
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| Potential earn-out payments period |
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4 years
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| Maximum | Purchase Agreement | Cortina Asset Management, LLC |
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| Subsequent Event [Line Items] |
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| Aggregate purchase amount |
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$ 44,937,000
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| Additional aggregate purchase amount |
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$ 26,209,000
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| Subsequent Event | Purchase Agreement | Cortina Asset Management, LLC |
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| Subsequent Event [Line Items] |
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| Business acquisition completion date |
Apr. 12, 2019
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| Aggregate purchase amount |
$ 33,577
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| Additional percentage to acquire business in cash |
80.00%
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| Subsequent Event | Purchase Agreement | Cortina Asset Management, LLC | Silvercrest L.P |
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| Subsequent Event [Line Items] |
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| Additional aggregate purchase amount |
$ 8,952
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| Additional percentage of earn out payment paid in cash |
20.00%
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| Potential earn-out payments period |
4 years
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| Subsequent Event | Purchase Agreement | Cortina Asset Management, LLC | Silvercrest L.P | Class B Common Stock |
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| Subsequent Event [Line Items] |
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| Issuance of Class B shares, Shares |
662,713
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| Subsequent Event | Maximum | Purchase Agreement | Cortina Asset Management, LLC |
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| Subsequent Event [Line Items] |
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| Additional aggregate purchase amount |
$ 26,209
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| City National Bank |
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| Subsequent Event [Line Items] |
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| Credit facility, borrowing capacity |
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$ 15,000,000
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| Credit facility, interest rate description |
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The Base Rate Margin and LIBOR Rate Margin were each decreased by 0.25 percentage points to 0.25 percentage points and 2.75 percentage points, respectively.
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| Line of credit facility, amendment description |
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The minimum discretionary assets under management covenant was amended such that (i) if the aggregate outstanding principal balance of the term loans and revolving loans is less than $5 million, the covenant is not applicable, (ii) if the aggregate outstanding principal balance of the term loans and revolving loans is greater than or equal to $5 million, but less than $10 million, the average amount of discretionary assets under management must be at least $8 billion and (iii) if the aggregate outstanding principal balance of the term loans and revolving loans is greater than or equal to $10 million, the average amount of discretionary assets under management must be at least $11 billion.
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| Borrowings under revolving credit facility |
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$ 0
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$ 0
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| City National Bank | Maximum | Covenant One |
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| Subsequent Event [Line Items] |
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| Borrowings under revolving credit facility |
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5,000,000
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| City National Bank | Maximum | Covenant Two |
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| Subsequent Event [Line Items] |
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| Borrowings under revolving credit facility |
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10,000,000
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| City National Bank | Minimum | Covenant Two |
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| Subsequent Event [Line Items] |
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| Borrowings under revolving credit facility |
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5,000,000
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| Average amount of discretionary assets under management |
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8,000,000,000
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| City National Bank | Minimum | Covenant Three |
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| Subsequent Event [Line Items] |
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| Borrowings under revolving credit facility |
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10,000,000
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| Average amount of discretionary assets under management |
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$ 11,000,000,000
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| City National Bank | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Credit facility maturity date |
Jul. 01, 2026
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| City National Bank | Base Rate | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Variable rate notes issued for redemption of partners' interests, spread |
2.75%
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| Delayed Draw Term Loan | City National Bank |
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| Subsequent Event [Line Items] |
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| Credit facility, borrowing capacity |
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$ 7,500,000
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| Credit facility maturity date |
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Jun. 24, 2025
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| Line of credit facility commitment period extended date |
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Jul. 01, 2024
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| Credit facility extended maturity date |
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Jul. 01, 2026
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| Credit facility, interest rate description |
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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.
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| Variable rate notes issued for redemption of partners' interests, spread |
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2.75%
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| Delayed Draw Term Loan | City National Bank | Maximum |
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| Subsequent Event [Line Items] |
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| Variable rate notes issued for redemption of partners' interests, spread |
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0.25%
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| Delayed Draw Term Loan | City National Bank | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Credit facility, borrowing capacity |
$ 25,500,000
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| Increase in credit facility, borrowing capacity |
18,000,000
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| Borrowings Under Revolving Credit Agreement | City National Bank |
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| Subsequent Event [Line Items] |
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| Credit facility, borrowing capacity |
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$ 7,500,000
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| Credit facility maturity date |
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Jun. 21, 2019
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| Credit facility extended maturity date |
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Jun. 19, 2020
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Jun. 19, 2020
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| Borrowings Under Revolving Credit Agreement | City National Bank | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Credit facility, borrowing capacity |
10,000,000
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| Increase in credit facility, borrowing capacity |
$ 2,500,000
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| Borrowings Under Revolving Credit Agreement | City National Bank | Base Rate | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Decrease in variable rate notes issued for redemption of partners' interests, spread |
0.25%
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| Borrowings Under Revolving Credit Agreement | City National Bank | Base Rate | Subsequent Event |
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| Subsequent Event [Line Items] |
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| Decrease in variable rate notes issued for redemption of partners' interests, spread |
0.25%
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| Variable rate notes issued for redemption of partners' interests, spread |
2.75%
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