XML 75 R57.htm IDEA: XBRL DOCUMENT v3.7.0.1
Related Party Transactions (Details)
shares in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
ft²
$ / ft²
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Associated Capital Group, Inc. [Member]      
Capital Lease [Abstract]      
Area of lease space (in square feet) | ft² 15,000    
Sublease rental base rate (in dollars per square foot) | $ / ft² 21.62    
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3    
Sublease rental base rate $ 297,185    
GGCP Holdings LLC [Member] | Common Class B [Member]      
Related Party Transaction [Line Items]      
Ownership percentage of voting rights 91.00%    
Percentage of ownership 62.00%    
GCI [Member] | Fund Advisor [Member] | Advisory Fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties $ 2,700,000 $ 1,000,000 $ 300,000
Percentage of net revenue paid to related party 90.00%    
GCI [Member] | Common Class A [Member]      
Related Party Transaction [Line Items]      
Ownership percentage of voting rights 2.00%    
Percentage of ownership 15.00%    
Shares owned by related party (in shares) | shares 4.4    
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    
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3    
Sublease rental base rate $ 116,564 119,686 117,640
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    
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3    
Sublease rental base rate $ 68,205 69,632 68,697
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 11,274 13,595 14,483
S.W.A.N. Partners, LP [Member] | G B L [Member] | Advisory Fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 18,206 20,406 22,094
Affiliated Funds [Member] | G.distributors, LLC [Member] | Distribution Fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties 41,000,000 47,700,000 $ 56,100,000
Affiliated Funds [Member] | G.distributors, LLC [Member] | Advisory and Distribution Fees [Member]      
Investment Advisory Services [Abstract]      
Revenue from related parties $ 32,900,000 $ 24,100,000