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INVESTMENTS - Composition of Investments in Unrealized Loss Position (Detail) | Mar. 31, 2014 | Dec. 31, 2013
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Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 100.00% | 100.00%
Percentage of Total Unrealized Losses | 100.00% | 100.00%
Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 94.00% | 96.00%
Percentage of Total Unrealized Losses | 87.00% | 92.00%
Perpetual securities: |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 6.00% | 4.00%
Percentage of Total Unrealized Losses | 13.00% | 8.00%
Japan government and agencies | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 4.00% | 25.00%
Percentage of Total Unrealized Losses | 0.00% | 1.00%
Public Utilities | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 14.00% | 13.00%
Percentage of Total Unrealized Losses | 12.00% | 12.00%
Sovereign and Supranational | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 4.00% | 3.00%
Percentage of Total Unrealized Losses | 3.00% | 4.00%
Banks/financial Institutions | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 19.00% | 14.00%
Percentage of Total Unrealized Losses | 26.00% | 22.00%
Other Corporate | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of Total Investments in an Unrealized Loss Position | 53.00% | 41.00%
Percentage of Total Unrealized Losses | 46.00% | 53.00%
Investment Grade | Perpetual securities: |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 91.00% | 90.00%
Investment Grade | Japan government and agencies | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 100.00%
Investment Grade | Public Utilities | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 96.00% | 98.00%
Investment Grade | Sovereign and Supranational | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 100.00% | 100.00%
Investment Grade | Banks/financial Institutions | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 62.00% | 64.00%
Investment Grade | Other Corporate | Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Percentage of unrealized losses attributable to securities that were investment grade | 87.00% | 91.00%

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