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Related Party Transactions (Details)
shares in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2017
ft²
$ / ft²
Dec. 31, 2017
USD ($)
ft²
$ / ft²
shares
Mar. 31, 2017
ft²
$ / ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Associated Capital Group, Inc. [Member]          
Capital Lease [Abstract]          
Area of lease space (in square feet) | ft² 15,000 15,000 15,000    
Sublease rental base rate (in dollars per square foot) | $ / ft² 22.03   21.62    
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3   3    
Sublease rental base rate   $ 367,798   $ 297,185  
Common Class A [Member] | Associated Capital Group, Inc. [Member]          
Related Party Transaction [Line Items]          
Ownership percentage of voting rights 2.00% 2.00%      
Percentage of ownership 15.00% 15.00%      
Shares owned by related party (in shares) | shares   4.4      
GGCP Holdings LLC [Member] | Common Class B [Member]          
Related Party Transaction [Line Items]          
Ownership percentage of voting rights 91.00% 91.00%      
Percentage of ownership 63.00% 63.00%      
GCI [Member] | Fund Advisor [Member] | Advisory Fees [Member]          
Investment Advisory Services [Abstract]          
Revenue from related parties   $ 2,800,000   2,700,000 $ 1,000,000
Percentage of net revenue paid to related party   90.00%      
Entity Controlled by Members of Chairman's Family [Member]          
Capital Lease [Abstract]          
Area of lease space (in square feet) | ft² 60,000 60,000      
LICT Corporation [Member]          
Capital Lease [Abstract]          
Area of lease space (in square feet) | ft² 3,300 3,300      
Sublease rental base rate (in dollars per square foot) | $ / ft²   28      
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft²   3      
Sublease rental base rate   $ 116,756   116,564 119,686
Teton [Member]          
Capital Lease [Abstract]          
Area of lease space (in square feet) | ft² 1,600 1,600      
Sublease rental base rate (in dollars per square foot) | $ / ft²   37.75      
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft²   3      
Sublease rental base rate   $ 68,293   68,205 69,632
MJG Associates, Inc [Member] | G B L [Member] | Advisory Fees [Member]          
Investment Advisory Services [Abstract]          
Revenue from related parties   10,000   10,000 10,000
Manhattan Partners I, L.P [Member] | G B L [Member] | Advisory Fees [Member]          
Investment Advisory Services [Abstract]          
Revenue from related parties   9,851   11,274 13,595
S.W.A.N. Partners, LP [Member] | G B L [Member] | Advisory Fees [Member]          
Investment Advisory Services [Abstract]          
Revenue from related parties   19,776   18,206 20,406
Affiliated Funds [Member] | G.distributors, LLC [Member] | Distribution Fees [Member]          
Investment Advisory Services [Abstract]          
Revenue from related parties   39,700,000   41,000,000 $ 47,700,000
Affiliated Funds [Member] | G.distributors, LLC [Member] | Advisory and Distribution Fees [Member]          
Investment Advisory Services [Abstract]          
Revenue from related parties   $ 30,400,000   $ 32,900,000