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Fair Value Measurements Narrative (Details) (USD $)
3 Months Ended 12 Months Ended 12 Months Ended 60 Months Ended 12 Months Ended 3 Months Ended 120 Months Ended 132 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Minimum [Member]
Dec. 31, 2010
Maximum [Member]
Dec. 31, 2012
SunTrust Acquisition [Member]
Dec. 31, 2011
Money Market Funds [Member]
Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2012
Customer Relationships [Member]
Dec. 31, 2011
Customer Relationships [Member]
Dec. 31, 2010
Customer Relationships [Member]
Dec. 31, 2012
Noncompete Agreements [Member]
Dec. 31, 2011
Noncompete Agreements [Member]
Dec. 31, 2010
Noncompete Agreements [Member]
Dec. 31, 2010
Property, Plant and Equipment, Other Types [Member]
Dec. 31, 2017
Acquisition-related Future Consideration Liabilities [Member]
Minimum [Member]
Dec. 31, 2017
Acquisition-related Future Consideration Liabilities [Member]
Maximum [Member]
Dec. 31, 2017
Acquisition-related Future Consideration Liabilities [Member]
Weighted Average [Member]
Dec. 31, 2010
Intangible asset related [Member]
Dec. 31, 2012
Consolidated feeder fund investment in offshore master investment fund [Member]
Dec. 31, 2011
Consolidated feeder fund investment in offshore master investment fund [Member]
Dec. 31, 2012
Equity Method Investee [Member]
Dec. 31, 2022
10-year compounded annual growth rate [Member]
Equity Method Investee [Member]
Dec. 31, 2033
Terminal Growth Rate [Member]
Equity Method Investee [Member]
Dec. 31, 2012
Liabilities Current [Member]
Dec. 31, 2012
Liabilities Non-current [Member]
Cash and cash equivalents invested in money market funds $ 60,200,000   $ 45,800,000                                              
Investments transferred from Level 1 to Level 2 2,000,000                                                  
Investments transferred from Level 2 to Level 1     3,500,000                                              
Trading Securities, Current 55,020,000   113,505,000                                 12,100,000 17,900,000          
Trading Securities, Debt, Current             77,100,000                                      
Interest Rate Cash Flow Hedge Liability at Fair Value 11,200,000                                               5,900,000 5,300,000
Fair value of acquisition-related future consideration liabilities, current           3,500,000                                        
Fair value of acquisition-related future consideration liabilities, noncurrent 8,300,000         4,700,000                                        
Fair Value Inputs Estimated Rate of Change for Underlying Assets Under Management                               (13.00%) 28.00% 4.00%         15.00% 3.00%    
Fair Value Inputs Estimate of Impact of Fee Waiver                               0.01% 0.02% 0.01%                
Fair Value Inputs, Discount Rate                               15.00% 18.00% 16.00%       17.00%        
Ownership interest in equity-method investment 12.00%                                                  
Other Asset Impairment Charges 3,000,000                                                  
Equity Method Investments 3,800,000                                                  
Probability-weighted scenarios assumed growth rates in assets       (100.00%) 9.00%                                          
Impairment of Intangible Assets, Finite-lived   10,200,000                                 8,200,000              
Finite-lived intangible assets, net value after impairment 8,682,000   12,097,000           7,898,000 10,534,000 2,000,000 784,000 1,563,000 800,000                        
Fixed assets value after impairment 38,912,000   38,228,000                       700,000                      
Fair value of asset               $ 2,100,000