INVESTMENTS - Composition of Investments in Unrealized Loss Position (Detail)	Mar. 31, 2015	Dec. 31, 2014
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	93.00%	95.00%
Percentage of Total Unrealized Losses	88.00%	89.00%
Perpetual securities
Investments, Unrealized Loss Position [Line Items]
Percentage of Total Investments in an Unrealized Loss Position	7.00%	5.00%
Percentage of Total Unrealized Losses	12.00%	11.00%
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	7.00%	7.00%
Sovereign and supranational | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage of Total Investments in an Unrealized Loss Position	3.00%	3.00%
Percentage of Total Unrealized Losses	1.00%	2.00%
Banks/financial Institutions | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage of Total Investments in an Unrealized Loss Position	23.00%	14.00%
Percentage of Total Unrealized Losses	39.00%	33.00%
Other corporate | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage of Total Investments in an Unrealized Loss Position	53.00%	65.00%
Percentage of Total Unrealized Losses	41.00%	47.00%
Investment Grade | Perpetual securities
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%	100.00%
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	33.00%	31.00%
Investment Grade | Other corporate | Fixed Maturities
Investments, Unrealized Loss Position [Line Items]
Percentage of unrealized losses attributable to securities that were investment grade	83.00%	88.00%