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Related Party Transactions, Compensation and Other (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 21, 2017
Sep. 30, 2017
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 29, 2017
Dec. 26, 2017
Aug. 15, 2016
Nov. 30, 2015
Compensation [Abstract]                        
Percentage payout of revenues or net operating contribution to the portfolio managers and marketing staff who introduce, service or generate private wealth management business         40.00%              
Payable to affiliates     $ 855,000   $ 1,041,000 $ 855,000            
Other [Abstract]                        
Deposited transaction amount         295,000 328,000 $ 353,000          
Institutional research services         $ 1,000,000 2,300,000 1,500,000          
Notice period of agreement between related parties         30 days              
Term of agreement between related parties         12 months              
Annual costs of setting up escrow account paid         $ 55,000              
Period of interest included in initial deposit         6 months              
AC 4% PIK Note [Member]                        
Other [Abstract]                        
Face value of debt         $ 0             $ 250,000,000
Debt instrument, interest rate         4.00%             4.00%
Debt instrument, maturity date         Nov. 30, 2020              
Interest expenses         $ 800,000 3,000,000 7,700,000          
Loan from GGCP [Member]                        
Other [Abstract]                        
Face value of debt         $ 35,000,000              
Debt instrument, maturity date         Dec. 28, 2016              
Interest expenses             415,000          
Loan from AC [Member]                        
Other [Abstract]                        
Face value of debt                   $ 15,000,000    
Debt instrument, interest rate                   1.60%    
Debt instrument, maturity date         Feb. 28, 2018              
Interest expenses         $ 40,000 40,000            
Convertible Notes [Member]                        
Other [Abstract]                        
Face value of debt                     $ 110,000,000  
Debt instrument, interest rate         4.50%           4.50%  
Debt instrument, maturity date     Aug. 15, 2021   Aug. 15, 2021              
Percentage of assets owned in escrow account 47.00% 53.00%                    
Cash deposited into escrow account $ 53,000,000 $ 60,000,000                    
GCI [Member] | 5.5% Demand Loan [Member]                        
Other [Abstract]                        
Interest expenses               $ 900,000        
Fund Advisor [Member]                        
Other [Abstract]                        
Institutional research services         $ 1,000,000 2,300,000 1,500,000          
Chairman and CEO [Member]                        
Compensation [Abstract]                        
Compensation waived         $ 56,500,000              
GGCP [Member]                        
Other [Abstract]                        
Percentage of assets owned in escrow account 47.00%     53.00%                
Cash deposited into escrow account $ 53,100,000     $ 60,000,000                
GGCP [Member] | Convertible Notes [Member]                        
Other [Abstract]                        
Additional amount paid to repurchase debt $ 1,400,000                      
GBL and Teton [Member]                        
Other [Abstract]                        
Flat sub-administration agreement percentage on mutual funds         0.20%              
Administration fees percentage on first tier of net assets         0.20%              
First tier net assets maximum         $ 370,000,000              
Administration fees percentage on second tier of net assets         0.12%              
Second tier net assets maximum         $ 630,000,000              
Administration fees percentage on third tier of net assets         0.10%              
Third tier net assets minimum         $ 1,000,000,000              
Monthly administrative service fee         4,167 18,750 25,000          
Administrative and management services         $ 2,100,000 $ 2,100,000 $ 2,000,000          
Certain Executive Officers and Employees [Member]                        
Compensation [Abstract]                        
Payable to affiliates                 $ 11,700,000      
Certain Executive Officers and Employees [Member] | Due on January 31, 2018 [Member]                        
Compensation [Abstract]                        
Payable to affiliates                 5,500,000      
Certain Executive Officers and Employees [Member] | Due on February 28, 2018 [Member]                        
Compensation [Abstract]                        
Payable to affiliates                 $ 6,200,000