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INVESTMENTS - Composition of Investments in Unrealized Loss Position in Bank and Financial Institution Sector (Detail) (Banks/financial Institutions) | Mar. 31, 2012 | Dec. 31, 2011
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Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 39.00% | 46.00%
Percentage of Total Unrealized Losses | 55.00% | 62.00%
Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 32.00% | 37.00%
Percentage of Total Unrealized Losses | 44.00% | 44.00%
Perpetual Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 7.00% | 9.00%
Percentage of Total Unrealized Losses | 11.00% | 18.00%
Perpetual Securities | Upper Tier II |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 4.00% | 4.00%
Percentage of Total Unrealized Losses | 5.00% | 6.00%
Perpetual Securities | Tier I |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 3.00% | 5.00%
Percentage of Total Unrealized Losses | 6.00% | 12.00%

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