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Investments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
EMP III [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Dec. 31, 2013
EMP III [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Dec. 31, 2010
Trilantic [Member]
Feb. 28, 2010
Trilantic [Member]
Jun. 30, 2014
G5 Evercore [Member]
Jun. 30, 2013
G5 Evercore [Member]
Jun. 30, 2014
G5 Evercore [Member]
Jun. 30, 2013
G5 Evercore [Member]
Dec. 31, 2013
G5 Evercore [Member]
Jun. 30, 2014
ABS [Member]
Jun. 30, 2013
ABS [Member]
Jun. 30, 2014
ABS [Member]
Jun. 30, 2013
ABS [Member]
Dec. 31, 2013
ABS [Member]
Jun. 30, 2014
Pan [Member]
Jun. 30, 2013
Pan [Member]
Mar. 16, 2013
Pan [Member]
Mar. 15, 2013
Pan [Member]
Dec. 31, 2008
Pan [Member]
Jun. 30, 2014
Minimum [Member]
ECP II [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Jun. 30, 2014
Maximum [Member]
ECP II [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Dec. 31, 2013
EMCP III [Member]
Jun. 30, 2014
EMCP III [Member]
EMP III [Member]
Dec. 31, 2013
EMCP III [Member]
EMP III [Member]
Jun. 30, 2014
EMCP III [Member]
Parent [Member]
Dec. 31, 2013
EMCP III [Member]
Parent [Member]
Dec. 31, 2013
EMCP III [Member]
Noncontrolling Interest [Member]
Jun. 30, 2014
Trilantic [Member]
Dec. 31, 2013
Trilantic [Member]
Dec. 31, 2013
Trilantic [Member]
Trilantic IV [Member]
Dec. 31, 2012
Trilantic [Member]
Trilantic IV [Member]
Jun. 30, 2014
Trilantic [Member]
Trilantic V [Member]
Dec. 31, 2013
Trilantic [Member]
Trilantic V [Member]
Schedule of Investments [Line Items]                                                                            
Subscribed capital commitments                                                     $ 201,000,000                      
Capital commitment                                                         10,750,000   1,000,000 9,750,000         5,000,000  
Unfunded commitments for capital contributions 9,882,000   9,882,000                                                 6,841,000   639,000             4,227,000  
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees 4,023,000 2,073,000 3,962,000 2,550,000                                                                    
Previously received carried interest subject to repayment 2,701,000   2,701,000                                                                      
Percent ownership of carried interest                                                 8.00% 9.00%                        
Consolidated assets           5,458,000 4,287,000                                                              
Consolidated liabilities           42,000 32,000                                                              
Issued LP Units (in shares)               500,000 500,000                                                          
Limited partnership investment 4,283,000   4,283,000   36,805,000     16,090,000                                                            
Investment                                                                 14,109,000 14,145,000 29,000 1,091,000 36,000 825,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares                       131,000                                                    
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned                   7,232,000   7,232,000                                                    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 7,916,000                                                                          
Equity method investment (as a percent)                   49.00%   49.00%     45.00%   45.00%         68.00% 50.00%                              
Income (loss) from equity method investments 2,038,000 1,015,000 2,279,000 1,771,000           817,000 247,000 (20,000) 184,000   1,221,000 768,000 2,299,000 1,642,000     (55,000)                                  
Equity method investment 77,577,000   77,577,000   67,560,000         35,328,000   35,328,000   20,001,000 42,249,000   42,249,000   47,559,000         4,158,000                            
Goodwill                                             3,020,000                              
Intangible Assets                                             1,440,000                              
Useful life (in years)                                       7 years                                    
Amortization of intangible assets $ 647,000 $ 647,000 $ 1,294,000 $ 1,294,000