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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2011
Redeemable Non - Controlling Interest
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Jun. 30, 2011
Redeemable Non - Controlling Interest
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Dec. 31, 2011
Redeemable Non - Controlling Interest
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| Variable Interest Entity [Line Items] | |||||||
| Adjustment to Redeemable Non-Controlling Interests | $ 506,200,000 | ||||||
| Net Gains (Losses) from Fund Investment Activities attributable to Redeemable Non-Controlling Interests in Consolidated Entities | $ 248,230,000 | $ (74,654,000) | $ 536,372,000 | $ (119,845,000) | $ 300,000 | $ 1,100,000 | |