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Investments - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2010
USD ($)
shares
Schedule of Investments [Line Items]                  
Equity Method Investment $ 86,532,000   $ 86,532,000   $ 86,287,000        
Marketable Securities 66,478,000   66,478,000   43,787,000        
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees 171,000 $ 1,933,000 6,302,000 $ 3,259,000          
Previously received carried interest subject to repayment 1,400,000   1,400,000            
Cost Method Investments           $ 1,079,000      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 8,654,000   8,654,000            
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 10,981,000   10,981,000            
Unfunded commitments for capital contributions 5,134,000   5,134,000            
Participation in Successor Funds 12,000,000   12,000,000            
Income (loss) from equity method investments 1,178,000 929,000 4,129,000 4,034,000          
GMCP II [Member]                  
Schedule of Investments [Line Items]                  
Distribution Made to Limited Partner, Cash Distributions Paid       3,194,000          
GMP III [Member]                  
Schedule of Investments [Line Items]                  
Noncontrolling Interest, Decrease from Deconsolidation     5,808,000            
Atalanta Sosnoff [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment $ 23,152,000   $ 23,152,000   23,990,000        
Equity method investment (as a percent) 49.00%   49.00%            
Income (loss) from equity method investments $ 172,000   $ 520,000            
Trilantic IV [Member]                  
Schedule of Investments [Line Items]                  
Distribution Made to Limited Partner, Cash Distributions Paid 3,092,000   3,304,000 1,650,000          
Trilantic [Member]                  
Schedule of Investments [Line Items]                  
Issued LP Units (in shares) | shares                 500,000
Limited partnership investment                 $ 16,090,000
G5 Evercore [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment $ 25,016,000   $ 25,016,000   20,730,000        
Equity method investment (as a percent) 49.00%   49.00%            
Income (loss) from equity method investments $ (107,000) (388,000) $ (78,000) 263,000          
ABS [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment $ 38,364,000   $ 38,364,000   41,567,000        
Equity method investment (as a percent) 45.00%   45.00%            
Income (loss) from equity method investments $ 1,113,000 1,317,000 $ 3,687,000 3,771,000          
ECP II [Member]                  
Schedule of Investments [Line Items]                  
Distribution Made to Limited Partner, Cash Distributions Paid       3,000,000          
CSI Capital [Member]                  
Schedule of Investments [Line Items]                  
Distribution Made to Limited Partner, Cash Distributions Paid       2,909,000          
Glisco [Member]                  
Schedule of Investments [Line Items]                  
Percent ownership of carried interest 20.00%                
Management Fee Period 10 years                
Number Of Successor Funds Returning Carried Interest 2                
Operational Support Period 18 months                
Value of Assets Deconsolidated     8,302,000            
Value of Liabilities Deconsolidated     2,343,000            
Cost Method Investments $ 2,519,000   $ 2,519,000            
Minimum [Member] | ECP II [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                  
Schedule of Investments [Line Items]                  
Percent ownership of carried interest     8.00%            
Maximum [Member] | ECP II [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                  
Schedule of Investments [Line Items]                  
Percent ownership of carried interest     9.00%            
Equity Method Investments [Member]                  
Schedule of Investments [Line Items]                  
Amortization of Intangible Assets 884,000 $ 621,000 $ 2,648,000 $ 1,863,000          
Trilantic [Member]                  
Schedule of Investments [Line Items]                  
Investment 12,150,000   12,150,000   12,812,000        
Trilantic [Member] | Trilantic IV [Member]                  
Schedule of Investments [Line Items]                  
Investment 50,000   50,000   8,000     $ 1,120,000  
Trilantic [Member] | Trilantic V [Member]                  
Schedule of Investments [Line Items]                  
Investment 612,000   612,000   636,000   $ 689,000 $ 825,000  
Capital commitment 5,000,000   5,000,000            
Unfunded commitments for capital contributions 2,550,000   2,550,000            
Private Equity Funds [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment 19,880,000   19,880,000   26,473,000        
Private Equity Funds [Member] | ECP II [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment 945,000   945,000   983,000        
Cash 863,000   863,000            
Marketable Securities 82,000   82,000            
Private Equity Funds [Member] | Trilantic V [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment 5,114,000   5,114,000   $ 4,117,000        
Other Revenue [Member] | Glisco [Member]                  
Schedule of Investments [Line Items]                  
Deconsolidation, Gain (Loss), Amount $ 406,000   $ 406,000