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INVESTMENTS - Composition of Investments in Unrealized Loss Position in Bank and Financial Institution Sector (Detail) (Banks/financial Institutions) | Mar. 31, 2013 | Dec. 31, 2012
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Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 33.00% | 22.00%
Percentage of Total Unrealized Losses | 55.00% | 50.00%
Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 26.00% | 18.00%
Percentage of Total Unrealized Losses | 35.00% | 39.00%
Perpetual Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 7.00% | 4.00%
Percentage of Total Unrealized Losses | 20.00% | 11.00%
Perpetual Securities | Upper Tier II |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 5.00% | 2.00%
Percentage of Total Unrealized Losses | 13.00% | 4.00%
Perpetual Securities | Tier I |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 2.00% | 2.00%
Percentage of Total Unrealized Losses | 7.00% | 7.00%

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