Related Party Transactions (Details)
$ in Thousands, £ in Millions, shares in Millions |
12 Months Ended |
|
|
Dec. 31, 2021
USD ($)
ft²
$ / ft²
shares
|
Dec. 31, 2021
GBP (£)
$ / ft²
ft²
shares
|
Dec. 31, 2020
USD ($)
ft²
$ / ft²
shares
|
Aug. 04, 2020
ft²
|
| Capital Lease [Abstract] |
|
|
|
|
| Amount received for rent and other expenses |
$ 150
|
|
$ 184
|
|
| Investment Advisory Services [Abstract] |
|
|
|
|
| Receivable from related parties |
3,440
|
|
$ 4,882
|
|
| Associated Capital Group, Inc. [Member] |
|
|
|
|
| Capital Lease [Abstract] |
|
|
|
|
| Area of lease space (in square feet) | ft² |
|
|
5,200
|
13,800
|
| Sublease rental base rate (in dollars per square foot) | $ / ft² |
|
|
22.32
|
|
| Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² |
|
|
3
|
|
| Amount received for rent and other expenses |
100
|
|
$ 100
|
|
| Investment Advisory Services [Abstract] |
|
|
|
|
| Rent paid |
$ 100
|
£ 0.2
|
$ 100
|
|
| Common Class A [Member] | Associated Capital Group, Inc. [Member] |
|
|
|
|
| Related Party Transactions [Abstract] |
|
|
|
|
| Shares owned by related party (in shares) | shares |
2.4
|
2.4
|
2.8
|
|
| Ownership percentage of voting rights |
1.00%
|
|
1.00%
|
|
| Percentage of ownership |
9.00%
|
|
10.00%
|
|
| GGCP Holdings LLC [Member] | Common Class B [Member] |
|
|
|
|
| Related Party Transactions [Abstract] |
|
|
|
|
| Ownership percentage of voting rights |
93.00%
|
|
93.00%
|
|
| Percentage of ownership |
69.00%
|
|
69.00%
|
|
| GCI [Member] | Fund Advisor [Member] | Advisory Fees [Member] |
|
|
|
|
| Investment Advisory Services [Abstract] |
|
|
|
|
| Revenue from related parties |
$ (8,900)
|
|
$ (7,200)
|
|
| Percentage of net revenue paid to related party |
90.00%
|
90.00%
|
|
|
| Entity Controlled by Members of Chairman's Family [Member] |
|
|
|
|
| Capital Lease [Abstract] |
|
|
|
|
| Area of lease space (in square feet) | ft² |
60,000
|
|
|
|
| LICT Corporation [Member] |
|
|
|
|
| Capital Lease [Abstract] |
|
|
|
|
| Area of lease space (in square feet) | ft² |
3,300
|
|
|
|
| Sublease rental base rate (in dollars per square foot) | $ / ft² |
28
|
28
|
|
|
| Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² |
3
|
3
|
|
|
| Amount received for rent and other expenses |
$ 100
|
|
100
|
|
| Teton [Member] |
|
|
|
|
| Capital Lease [Abstract] |
|
|
|
|
| Area of lease space (in square feet) | ft² |
1,600
|
|
|
|
| Sublease rental base rate (in dollars per square foot) | $ / ft² |
37.75
|
37.75
|
|
|
| Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² |
3
|
3
|
|
|
| Amount received for rent and other expenses |
$ 100
|
|
100
|
|
| MJG Associates, Inc [Member] | GBL [Member] | Advisory Fees [Member] |
|
|
|
|
| Investment Advisory Services [Abstract] |
|
|
|
|
| Revenue from related parties |
10
|
|
10
|
|
| Affiliated Funds [Member] | G.distributors, LLC [Member] | Advisory and Distribution Fees [Member] |
|
|
|
|
| Investment Advisory Services [Abstract] |
|
|
|
|
| Receivable from related parties |
26,900
|
|
24,400
|
|
| Affiliated Funds [Member] | G.distributors, LLC [Member] | Distribution Fees [Member] |
|
|
|
|
| Investment Advisory Services [Abstract] |
|
|
|
|
| Revenue from related parties |
23,700
|
|
$ 23,100
|
|
| Morgan Group Holding Co. [Member] |
|
|
|
|
| Capital Lease [Abstract] |
|
|
|
|
| Area of lease space (in square feet) | ft² |
|
|
2,800
|
|
| Amount received for rent and other expenses |
$ 100
|
|
$ 40
|
|