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Investments - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Schedule of Investments [Line Items]                
Equity Method Investment $ 83,669,000   $ 86,287,000          
Marketable Securities 46,865,000   43,787,000          
Unfunded commitments for capital contributions 5,610,000              
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees 1,367,000 $ (489,000)            
Previously received carried interest subject to repayment 0              
Participation in Successor Funds 12,000,000              
Cost Method Investments       $ 1,079,000        
Income (loss) from equity method investments 1,287,000 1,107,000            
Amortization of intangible assets 880,000 621,000            
Variable Interest Entity, Primary Beneficiary [Member]                
Schedule of Investments [Line Items]                
Consolidated assets 97,962,000   151,583,000          
Consolidated liabilities 66,543,000   110,424,000          
Atalanta Sosnoff [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment $ 23,713,000   23,990,000          
Equity method investment (as a percent) 49.00%              
Income (loss) from equity method investments $ 205,000              
EMCP II [Member]                
Schedule of Investments [Line Items]                
Distribution Made to Limited Partner, Cash Distributions Paid   3,194,000            
EMP III [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Schedule of Investments [Line Items]                
Consolidated assets 6,031,000   6,030,000          
Consolidated liabilities 176,000   164,000          
Trilantic [Member]                
Schedule of Investments [Line Items]                
Issued LP Units (in shares)               500,000
Limited partnership investment               $ 16,090,000
G5 Evercore [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment $ 22,596,000   20,730,000          
Equity method investment (as a percent) 49.00%              
Income (loss) from equity method investments $ (248,000) (57,000)            
ABS [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment $ 37,360,000   41,567,000          
Equity method investment (as a percent) 45.00%              
Income (loss) from equity method investments $ 1,330,000 1,164,000            
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   $ 2,750,000            
Minimum [Member] | ECP II [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Schedule of Investments [Line Items]                
Percent ownership of carried interest 8.00%              
Maximum [Member] | ECP II [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Schedule of Investments [Line Items]                
Percent ownership of carried interest 9.00%              
EMCP III [Member]                
Schedule of Investments [Line Items]                
Subscribed capital commitments           $ 201,000,000    
EMCP III [Member] | EMP III [Member]                
Schedule of Investments [Line Items]                
Capital commitment           10,750,000    
Unfunded commitments for capital contributions $ 4,437,000              
EMCP III [Member] | Parent [Member]                
Schedule of Investments [Line Items]                
Capital commitment           1,000,000    
Unfunded commitments for capital contributions 382,000              
EMCP III [Member] | Noncontrolling Interest [Member]                
Schedule of Investments [Line Items]                
Capital commitment           9,750,000    
Trilantic [Member]                
Schedule of Investments [Line Items]                
Investment 12,779,000   12,812,000          
Trilantic [Member] | Trilantic IV [Member]                
Schedule of Investments [Line Items]                
Investment     8,000     29,000 $ 1,091,000  
Trilantic [Member] | Trilantic V [Member]                
Schedule of Investments [Line Items]                
Capital commitment 5,000,000              
Unfunded commitments for capital contributions 2,905,000              
Investment 33,000   636,000   $ 689,000 $ 825,000    
Private Equity Funds [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment 27,578,000   26,473,000          
Private Equity Funds [Member] | ECP II [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment 972,000   983,000          
Cash 741,000              
Escrow Deposit 85,000              
Seller Note 66,000              
Marketable Securities 80,000              
Private Equity Funds [Member] | EMCP III [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment 5,776,000   5,786,000          
Private Equity Funds [Member] | Trilantic V [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment $ 4,183,000   $ 4,117,000