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INVESTMENTS (DETAILS 4) (USD $)
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Dec. 31, 2011
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Dec. 31, 2010
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|---|---|---|
| Other Investments [Line Items] | ||
| Total other investments | $ 699,320,000 | $ 519,296,000 |
| Percentage of total fair value | 100.00% | 100.00% |
| Percentage subject to lockups | 13.00% | 8.00% |
| Total hedge & credit funds currently in liquidation or in a period of planned principal distribution | 45,000,000 | 58,000,000 |
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Multi-strategy Funds [Member] | Quarterly Semi Annually [Member]
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| Other Investments [Line Items] | ||
| Total other investments | 230,750,000 | 256,392,000 |
| Percentage of total fair value | 33.00% | 49.00% |
| Percentage subject to lockups | 0.00% | 4.00% |
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Multi-strategy Funds [Member] | Quarterly Semi Annually [Member] | Minimum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 60 | 60 |
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Multi-strategy Funds [Member] | Quarterly Semi Annually [Member] | Maximum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 95 | 95 |
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Long/Short Equity Funds [Member] | Quarterly Semi Annually [Member]
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| Other Investments [Line Items] | ||
| Total other investments | 214,498,000 | |
| Percentage of total fair value | 31.00% | |
| Percentage subject to lockups | 13.00% | |
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Long/Short Equity Funds [Member] | Quarterly Semi Annually [Member] | Minimum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 30 | |
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Long/Short Equity Funds [Member] | Quarterly Semi Annually [Member] | Maximum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 60 | |
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Long/Short Equity Funds [Member] | Quarterly [Member]
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| Other Investments [Line Items] | ||
| Total other investments | 50,784,000 | |
| Percentage of total fair value | 10.00% | |
| Percentage subject to lockups | 0.00% | |
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Long/Short Equity Funds [Member] | Quarterly [Member] | Minimum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 45 | |
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Long/Short Equity Funds [Member] | Quarterly [Member] | Maximum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 60 | |
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Event Driven Funds [Member] | Quarterly Annually [Member]
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| Other Investments [Line Items] | ||
| Total other investments | 118,380,000 | 73,096,000 |
| Percentage of total fair value | 17.00% | 14.00% |
| Percentage subject to lockups | 0.00% | 4.00% |
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Event Driven Funds [Member] | Quarterly Annually [Member] | Minimum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 45 | 45 |
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Event Driven Funds [Member] | Quarterly Annually [Member] | Maximum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 95 | 95 |
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Leveraged Bank Loans Funds [Member] | Quarterly Semi Annually [Member]
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| Other Investments [Line Items] | ||
| Total other investments | 82,761,000 | |
| Percentage of total fair value | 16.00% | |
| Percentage subject to lockups | 0.00% | |
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Leveraged Bank Loans Funds [Member] | Quarterly Semi Annually [Member] | Minimum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 65 | |
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Leveraged Bank Loans Funds [Member] | Quarterly Semi Annually [Member] | Maximum [Member]
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| Other Investments [Line Items] | ||
| Redemption notice period (days) | 75 | |
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Leveraged Bank Loans Funds [Member] | Quarterly [Member]
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| Other Investments [Line Items] | ||
| Total other investments | 69,132,000 | |
| Percentage of total fair value | 10.00% | |
| Redemption notice period (days) | 65 | |
| Percentage subject to lockups | 0.00% | |
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CLO Equity Tranched Securities [Member]
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| Other Investments [Line Items] | ||
| Total other investments | $ 66,560,000 | $ 56,263,000 |
| Percentage of total fair value | 9.00% | 11.00% |
| Percentage subject to lockups | 0.00% | 0.00% |