REINSURANCE (Detail) - Analysis of the total recoverable and reinsurance balances receivable by reinsurers owing more than 3%	Dec. 31, 2011
Munich Reinsurance Company [Member] | Standard & Poor's, AA- Rating [Member]
Loss and loss expenses recoverable and reinsurance balances receivable by reinsurers owing more than 3 percent	22.80%
Swiss Reinsurance Company [Member] | Standard & Poor's, AA- Rating [Member]
Loss and loss expenses recoverable and reinsurance balances receivable by reinsurers owing more than 3 percent	12.20%
Swiss Re Europse S.A. [Member] | Standard & Poor's, AA- Rating [Member]
Loss and loss expenses recoverable and reinsurance balances receivable by reinsurers owing more than 3 percent	5.10%
Transatlantic Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member]
Loss and loss expenses recoverable and reinsurance balances receivable by reinsurers owing more than 3 percent	3.70%
Everest Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member]
Loss and loss expenses recoverable and reinsurance balances receivable by reinsurers owing more than 3 percent	3.00%