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Investments (Schedule of Investments and Cash and Cash Equivalents) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Fair value of other invested assets $ 562,267 $ 347,632
Unfunded Commitments 332,607  
Ratio of the fund's long investments in securities to fund's equity capital 100.00%  
Percentage of gross exposure addition of long and short exposure 100.00%  
Private Equity Funds [Member]
    
Fair value of other invested assets 56,707  
Unfunded Commitments 182,296  
Long Exposure 100.00% [1]  
Short Exposure 0.00% [2]  
Gross Exposure 100.00% [3]  
Net Exposure 100.00% [4]  
Mezzanine Debt [Member]
    
Fair value of other invested assets 1,978  
Unfunded Commitments 113,022  
Long Exposure 100.00% [1]  
Short Exposure 0.00% [2]  
Gross Exposure 100.00% [3]  
Net Exposure 100.00% [4]  
Distressed [Member]
    
Fair value of other invested assets 62,498  
Unfunded Commitments 37,289  
Long Exposure 73.00% [1]  
Short Exposure 10.00% [2]  
Gross Exposure 83.00% [3]  
Net Exposure 63.00% [4]  
Total Private Equity [Member]
    
Fair value of other invested assets 121,183  
Unfunded Commitments 332,607  
Short Exposure 0.00% [2]  
Equity Long/Short [Member]
    
Fair value of other invested assets 186,142  
Unfunded Commitments    
Long Exposure 104.00% [1]  
Short Exposure 67.00% [2]  
Gross Exposure 171.00% [3]  
Net Exposure 37.00% [4]  
Multi-Strategy [Member]
    
Fair value of other invested assets 170,168  
Unfunded Commitments    
Long Exposure 101.00% [1]  
Short Exposure 60.00% [2]  
Gross Exposure 161.00% [3]  
Net Exposure 41.00% [4]  
Event Driven [Member]
    
Fair value of other invested assets 84,774  
Unfunded Commitments    
Long Exposure 115.00% [1]  
Short Exposure 75.00% [2]  
Gross Exposure 190.00% [3]  
Net Exposure 40.00% [4]  
[1] Long exposure represents the ratio of the fund's long investments in securities to the fund's equity capital (over 100% may denote explicit borrowing).
[2] Short exposure represents the ratio of the securities sold short to the fund's equity capital.
[3] Gross exposure is the addition of the long and short exposures (over 100% may denote explicit borrowing).
[4] Net exposure is the subtraction of the short exposure from the long exposure.