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Investment In Unconsolidated Affiliates (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
LSV Employee Group II [Member]
Oct. 22, 2013
LSV Employee Group II [Member]
Apr. 11, 2011
LSV Employee Group II [Member]
Sep. 30, 2013
LSV Employee Group III [Member]
Oct. 02, 2012
LSV Employee Group III [Member]
Sep. 30, 2013
Maximum [Member]
Oct. 22, 2013
Financial Guarantee [Member]
L S V Asset Management [Member]
Oct. 02, 2012
Financial Guarantee [Member]
L S V Asset Management [Member]
Oct. 22, 2013
Financial Guarantee [Member]
LSV Employee Group II [Member]
Apr. 11, 2011
Financial Guarantee [Member]
LSV Employee Group II [Member]
Sep. 30, 2013
Financial Guarantee [Member]
LSV Employee Group III [Member]
Oct. 22, 2013
Financial Guarantee [Member]
LSV Employee Group III [Member]
Oct. 02, 2012
Financial Guarantee [Member]
LSV Employee Group III [Member]
Sep. 30, 2013
L S V Asset Management [Member]
Sep. 30, 2012
L S V Asset Management [Member]
Sep. 30, 2013
L S V Asset Management [Member]
Sep. 30, 2012
L S V Asset Management [Member]
Dec. 31, 2012
L S V Asset Management [Member]
Sep. 30, 2013
Gao Fu [Member]
Sep. 30, 2013
Gao Fu [Member]
Investments in and Advances to Affiliates [Line Items]                                                
Equity method investment, ownership percentage                   50.00%               39.30%   39.30%   39.80%    
Total investment in equity method investee                                   $ 46,414   $ 46,414     $ 11,015 $ 11,015
Goodwill                                   3,062   3,062        
Partnership distribution payments received from LSV     109,173 72,306                                        
Company's share in the earnings of equity method investee 31,028 24,928 86,204 74,970                           31,285 24,928 86,871 74,970   (257) (667)
Originating transaction for Company's guaranty agreement         In April 2011, LSV Employee Group II agreed to purchase a partnership interest of an existing LSV employee     In October 2012, LSV Employee Group III purchased a portion of the partnership interest of three existing LSV employees                                
Purchase price paid for partnership interest in LSV             4,300   77,700                              
Triggering event related to Company's guaranty agreement         The lenders have the right to seek payment from the Company in the event of a default by LSV Employee Group II                   The lenders have the right to seek payment from the Company in the event of a default by LSV Employee Group III                  
Loans Payable           1,026     69,930                              
Guarantor Obligations, Maximum Exposure, Undiscounted                     13,086 24,930   3,655   45,000 45,000              
Guarantor Obligations, Current Carrying Value                         $ 0     $ 0