OTHER INVESTMENTS (Detail) - Schedule of net unrealized and realized gains (losses) on investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Unrealized Gains on Alternative and Private Equity Investments	$ 130,598	$ 104,151
Realized Gains (Losses) on Other Investments	13,705	3,575	21,809
Alternative Investments [Member]
Net Unrealized Gains on Alternative and Private Equity Investments	96,873	86,053
Realized Gains (Losses) on Other Investments	10,120	526	21,809
Private Investments [Member]
Net Unrealized Gains on Alternative and Private Equity Investments	33,725	18,098
Realized Gains (Losses) on Other Investments	$ 3,585	$ 3,049	$ 0