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Business Changes And Developments (Narrative) (Details)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Aug. 19, 2011
USD ($)
Sep. 30, 2011
years
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 29, 2011
Aug. 19, 2011
Lexicon [Member]
USD ($)
Aug. 19, 2011
Lexicon [Member]
GBP (£)
Aug. 19, 2011
Lexicon [Member]
USD ($)
Dec. 31, 2011
Lexicon [Member]
USD ($)
Dec. 29, 2011
ABS [Member]
USD ($)
Sep. 30, 2011
EAM [Member]
USD ($)
Dec. 31, 2011
EAM [Member]
USD ($)
Dec. 31, 2010
EAM [Member]
USD ($)
Dec. 31, 2009
EAM [Member]
USD ($)
Dec. 31, 2011
AS [Member]
USD ($)
Dec. 31, 2010
AS [Member]
USD ($)
May 31, 2010
AS [Member]
USD ($)
May 28, 2010
AS [Member]
USD ($)
Dec. 31, 2011
Morse, Williams And Company, Inc. [Member]
USD ($)
Dec. 31, 2010
Morse, Williams And Company, Inc. [Member]
USD ($)
May 31, 2010
Morse, Williams And Company, Inc. [Member]
USD ($)
Apr. 30, 2010
MJC Associates [Member]
USD ($)
Dec. 31, 2011
MJC Associates [Member]
USD ($)
Dec. 31, 2010
MJC Associates [Member]
USD ($)
Feb. 28, 2010
Private Funds Group Of Neuberger Berman [Member]
USD ($)
Dec. 31, 2011
Private Funds Group Of Neuberger Berman [Member]
USD ($)
Dec. 31, 2010
Private Funds Group Of Neuberger Berman [Member]
USD ($)
Oct. 31, 2010
G5 [Member]
USD ($)
Dec. 29, 2011
Parent Company [Member]
Aug. 19, 2011
Class A [Member]
USD ($)
Dec. 31, 2011
Class A [Member]
USD ($)
Dec. 31, 2010
Class A [Member]
USD ($)
Dec. 31, 2011
Class A [Member]
Lexicon [Member]
USD ($)
Dec. 31, 2011
Class A [Member]
Lexicon [Member]
GBP (£)
Dec. 31, 2011
Class A [Member]
Parent Company [Member]
USD ($)
Dec. 31, 2010
Class A [Member]
Parent Company [Member]
USD ($)
May 31, 2010
Series A-2 [Member]
AS [Member]
May 31, 2010
Series B [Member]
AS [Member]
May 31, 2010
Series C [Member]
AS [Member]
May 31, 2010
Series A-1 [Member]
AS [Member]
Dec. 31, 2011
Deferred Payment [Member]
USD ($)
Dec. 31, 2011
Deferred Payment [Member]
GBP (£)
Aug. 19, 2011
Deferred Payment [Member]
Class A [Member]
Aug. 19, 2011
Client Related Intangible Assets [Member]
USD ($)
Dec. 31, 2011
Client Related Intangible Assets [Member]
USD ($)
Dec. 31, 2011
Client Related Intangible Assets [Member]
Lexicon [Member]
USD ($)
Dec. 31, 2010
Client Relationships [Member]
AS [Member]
USD ($)
May 31, 2010
Client Relationships [Member]
Morse, Williams And Company, Inc. [Member]
USD ($)
Apr. 30, 2010
Client Relationships [Member]
MJC Associates [Member]
USD ($)
Feb. 28, 2010
Client Relationships [Member]
Private Funds Group Of Neuberger Berman [Member]
USD ($)
Dec. 31, 2010
Trademarks [Member]
AS [Member]
USD ($)
Dec. 31, 2010
Non-Compete/Non-Solicit Agreements [Member]
AS [Member]
USD ($)
Apr. 30, 2010
Non-Compete/Non-Solicit Agreements [Member]
MJC Associates [Member]
USD ($)
Apr. 30, 2010
Three anniversary Dates [Member]
MJC Associates [Member]
USD ($)
Feb. 28, 2010
Acquired Mandates [Member]
Private Funds Group Of Neuberger Berman [Member]
USD ($)
Dec. 31, 2010
Minimum [Member]
AS [Member]
USD ($)
Dec. 31, 2010
Maximum [Member]
AS [Member]
USD ($)
Business Acquisition [Line Items]                                                                                                                    
Approximate amount to be received by sellers of acquiree entity             $ 76,167 £ 46,142 $ 76,167               $ 14,700                                 $ 9,274 £ 5,619                                              
Approximate number of shares of common stock receivable by sellers of acquiree entity                                                             1,911,000                                                      
Common stock, par value                                                             $ 0.01 $ 0.01 $ 0.01     $ 0.01 $ 0.01                                          
Cash received by sellers for consideration 52,160           52,160 31,598 52,160   45,104             68,992 68,992       2,000           10,867                                                   1,000      
Shares of common stock issued for purchase consideration                                                             28                         1,883                            
Payment of remaining cash             9,274   9,274               1,470                                                 14,733 8,925                              
Period of deferral of issue of class of restricted shares, years   4                                                                                                                
Funded repayment of outstanding capital notes             8,318 5,039                                                                                                    
Gross fair value of accounts receivable     7,821       7,821   7,821                   7,034                                                                              
Client related intangible assets recorded in connection with acquisition             7,164   7,164                   43,280                                                     7,164   39,700 1,130 940 2,300 1,800 1,780 135   1,810    
Amortization expense of client related intangible assets recognized                                                                                         5,075   5,075                      
Revenue related to acquiree from the period of acquisition 41,637                 41,637           43,617 27,079           3,000                                                                      
Operating expenses related to acquiree from the period of acquisition 32,073                 32,073                                                                                                
Income resulting out of acquisition from the period of acquisition 9,564                 9,564                                                                                                
Other expenses incurred related to acquisition                 23,587                                                                                                  
Compensation charges                 14,618                                                                                                  
Acquisition related special charges included in other expenses related to acquisition                 3,894                                                                                                  
Expenses associated with amortization of intangible assets     14,315 7,541 2,096       5,075             6,228 3,632     124 84     24 954   760 664                                                            
Non-controlling interest         5.00%           45.00%             49.00%                     50.00%                     66.00% 49.00%                                  
Remaining interest                     55.00%             51.00%                                       5.50% 19.60% 25.90%                                    
Charge in the investment management segment related to the write-off of client-based intangible assets                       975                                                                                            
Goodwill allocated     177,849 139,031 49,764             94,700                   848 6,183     990                                                                
Institutional Asset Management reporting unit exceeded carrying value                       15.00%                                                                                            
Pretax income or losses                         4,198 2,618 2,264 7,816 5,264                                                                                  
Earnings before interest, taxes, depreciation and amortization ("EBITDA") exceed                                                                                                                 17 19,500
Earn-out consideration payable in cash                                 50.00%                       50.00%                                                          
Earn-out consideration payable in restricted Class A Shares                                 50.00%                       50.00%                                                          
Majority earn-out consideration payable in cash                                 20.00%                                                                                  
Intangible assets amortized over estimated useful lives, minimum years                                 4           5     4                                                                
Intangible assets amortized over estimated useful lives, maximum years                                 15           5     7                                                                
Fair value earn-out consideration                                       1,096 627     4,570 5,282     1,653                                                            
Acquisition included share-based initial consideration                                           1,350       1,000                                                                
Intangible assets amortization period                   6                                                                             9                  
Initital consideration received, Restricted shares of Class A common stock                                                         $ 10,319                                                          
Number of governing management committee members           5         3                                     2