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Fair Value (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 9 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Mar. 31, 2011
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Jun. 30, 2013
Median [Member]
Dec. 31, 2012
Median [Member]
Jun. 30, 2013
Private Equity Technology, Media and Telecommunications [Member]
Dec. 31, 2012
Private Equity Technology, Media and Telecommunications [Member]
Dec. 31, 2012
Private Equity Technology, Media and Telecommunications [Member]
Minimum [Member]
Dec. 31, 2012
Private Equity Technology, Media and Telecommunications [Member]
Maximum [Member]
Dec. 31, 2012
Private Equity Healthcare and Cleantech [Member]
Dec. 31, 2012
Private Equity Healthcare and Cleantech [Member]
Minimum [Member]
Dec. 31, 2012
Private Equity Healthcare and Cleantech [Member]
Maximum [Member]
Jun. 30, 2013
Private Equity Investment Venture Capital Fund [Member]
Dec. 31, 2012
Private Equity Investment Venture Capital Fund [Member]
Jun. 30, 2013
Consolidated Private Equity Investment Venture Capital Fund [Member]
Dec. 31, 2012
Consolidated Private Equity Investment Venture Capital Fund [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Private Equity Technology, Media and Telecommunications [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Private Equity Technology, Media and Telecommunications [Member]
Minimum [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Private Equity Technology, Media and Telecommunications [Member]
Maximum [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Private Equity Healthcare and Cleantech [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Private Equity Healthcare and Cleantech [Member]
Minimum [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Private Equity Healthcare and Cleantech [Member]
Maximum [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]                                                                                        
Money markets                                                       $ 170,120,000 $ 340,548,000               $ 170,120,000 $ 340,548,000   $ 0 $ 0   $ 0 $ 0
U.S. Treasury bills                                                       1,537,150,000 1,277,944,000               0 0   1,537,150,000 1,277,944,000   0 0
U.K. Treasury bills                                                     117,000 125,000 119,000             0 0 0 117,000 125,000 119,000 0 0 0
Equity securities [Abstract]                                                                                        
Growth                                                     116,486,000 125,242,000 107,991,000             116,486,000 125,242,000 107,802,000 0 0 189,000 0 0 0
Value                                                     36,356,000 36,126,000 60,105,000             36,356,000 36,126,000 60,096,000 0 0 9,000 0 0 0
Blend                                                       59,449,000 118,208,000               59,449,000 118,208,000   0 0   0 0
Other                                                     56,399,000 [1] 39,702,000 [1] 45,583,000 [1]             56,399,000 [1] 39,702,000 [1] 45,583,000 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Fixed Income securities [Abstract]                                                                                        
Taxable                                                     149,698,000 [2] 178,854,000 [2] 124,550,000 [2]             146,730,000 [2] 177,635,000 [2] 110,062,000 [2] 2,968,000 [2] 1,219,000 [2] 14,488,000 [2] 0 [2] 0 [2] 0 [2]
Tax-exempt                                                     6,022,000 [3] 6,458,000 [3] 16,109,000 [3]             5,227,000 [3] 5,661,000 [3] 15,366,000 [3] 795,000 [3] 797,000 [3] 743,000 [3] 0 [3] 0 [3] 0 [3]
Other                                                         17,000                 17,000     0     0
Derivatives                                                     7,626,000 2,625,000 3,621,000             1,619,000 64,000 127,000 6,007,000 2,561,000 3,494,000 0 0 0
Long exchange-traded options                                                     13,074,000 15,087,000 14,322,000             13,074,000 15,087,000 14,322,000 0 0 0 0 0 0
Private equity                                                     85,876,000 84,648,000 76,058,000             5,229,000 7,695,000 11,592,000 19,221,000 0 0 61,426,000 76,953,000 64,466,000
Total assets measured at fair value                                                     1,621,368,000 2,255,586,000 2,185,175,000             706,773,000 636,781,000 823,723,000 853,169,000 1,541,852,000 1,296,986,000 61,426,000 76,953,000 64,466,000
Securities sold not yet purchased [Abstract]                                                                                        
Short equities - corporate                                                     37,769,000 54,370,000 34,469,000             37,769,000 54,370,000 34,469,000 0 0 0 0 0 0
Short exchange-traded options                                                     15,065,000 9,197,000 3,567,000             15,065,000 9,197,000 3,567,000 0 0 0 0 0 0
Other                                                       271,000 1,271,000               271,000 1,271,000   0 0   0 0
Derivatives                                                     1,278,000 7,070,000 7,259,000             70,000 1,598,000 2,054,000 1,208,000 5,472,000 5,205,000 0 0 0
Total liabilities measured at fair value                                                     54,112,000 70,908,000 46,566,000             52,904,000 65,436,000 41,361,000 1,208,000 5,472,000 5,205,000 0 0 0
Transfers out of Level 3 19,200,000 13,500,000 13,500,000 3,600,000 19,200,000                                                                              
Transfers out of Level 2                 6,000,000 3,700,000 20,600,000                                                                  
Fair value measurement Level 3 reconciliation [Abstract]                                                                                        
Balance as of beginning of period 74,853,000 58,235,000 64,466,000 59,414,000 76,953,000 64,466,000 64,466,000 59,414,000                                                                        
Transfers (out) in, net (19,220,000) 0     (19,220,000) (13,548,000) (13,548,000) (3,588,000)                                                                        
Purchases 87,000 1,988,000     97,000 3,833,000 19,660,000 10,002,000                                                                        
Sales (34,000) (1,823,000)     (34,000) (1,823,000) (1,823,000) (214,000)                                                                        
Realized gains (losses), net (6,581,000) 855,000     (6,581,000) 855,000 (7,524,000) (3,106,000)                                                                        
Unrealized gains (losses), net 12,321,000 (1,347,000)     10,211,000 4,125,000 15,722,000 1,958,000                                                                        
Balance as of end of period 61,426,000 57,908,000 58,235,000   61,426,000 57,908,000 76,953,000 64,466,000                                                                        
Percentage of consolidated venture capital fund the Company owned (in hundredths) 10.00%       10.00%   10.00%                                                                          
Percentage of consolidated venture capital fund non-controlling interests owned (in hundredths) 90.00%       90.00%   90.00%                                                                          
Quantitative information about Level 3 fair value measurements [Abstract]                                                                                        
Fair value                                 23,256,000     14,871,000                   23,256,000     1,849,000                      
Valuation technique                                 Market comparable companies     Market comparable companies                   Market comparable companies     Market comparable companies                      
Revenue multiple                           8.4 10.1 [4]     2.5 6   0.6 [4] 62.5 [4]                 2.5 6.0   0.7 [5] 62.5 [5]                  
Discount rate (in hundredths)                       7.00% 10.00%       18.00%                         18.00%                            
Discount years                                   1 2                     1.5                            
R & D Multiple                                         1.0 [4] 30.6 [4]                                            
Discount for lack of marketability and risk factors (in hundredths)                                         40.00% 60.00%                       50.00% 60.00%                  
Majority of R & D, Multiple                                         4 [4] 11.4 [4]                                            
Description of investment                               communications, consumer, digital media, healthcare and information technology markets             energy sector Private equity fund focused on energy sector clean energy, resource and energy efficiency and other sustainable industries Clean energy, resource and energy efficiency and other sustainable industries                                    
Private equity investment at fair value                               28,500,000 29,900,000           7,700,000 7,700,000 200,000 1,200,000                                    
Unfunded commitments to investments                               $ 12,200,000 $ 12,200,000           $ 100,000 $ 200,000 $ 200,000 $ 200,000                                    
[1] Primarily long positions in corporate equities traded through our options desk.
[2] Primarily corporate and government securities.
[3] Primarily municipal bonds.
[4] The median for the Healthcare and Cleantech revenue multiple is 10.1; the majority of the R&D multiples fall between 4.0 and 11.4
[5] The median for the Healthcare and Cleantech revenue multiple is 8.4; the median R&D multiple is 5.2.