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INVESTMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Private Equity Investments, at Fair Value    
Fair value of investment with greater than 5% of total private equity investments $ 40,697,848 $ 37,495,360
Aggregate investments in other than equity securities 364,543 1,897,362
Investment Concentration Risk | Investments.
   
Private Equity Investments, at Fair Value    
Minimum percentage of total private equity investments 5.00% 5.00%
Fair value of investment with greater than 5% of total private equity investments 5,615,475 7,712,732
Alliance Boots | Investment Concentration Risk | Investments.
   
Private Equity Investments, at Fair Value    
Fair value of investment with greater than 5% of total private equity investments 3,516,964 2,459,263
HCA | Investment Concentration Risk | Investments.
   
Private Equity Investments, at Fair Value    
Fair value of investment with greater than 5% of total private equity investments 2,098,511 1,854,248
Dollar General | Investment Concentration Risk | Investments.
   
Private Equity Investments, at Fair Value    
Fair value of investment with greater than 5% of total private equity investments   $ 3,399,221