LOSSES AND LOSS EXPENSES (Detail) - Reconciliation of unpaid losses and loss expenses related to asbestos and environmental exposure claims (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net unpaid losses and loss expenses at beginning of year	$ 84,075	$ 100,922	$ 111,860
Net incurred losses and loss expenses	(41)	(130)	(312)
Less net paid losses and loss expenses	6,256	16,718	10,626
Net increase (decrease) in unpaid losses and loss expenses	(6,297)	(16,848)	(10,938)
Net unpaid losses and loss expenses at end of year	77,778	84,075	100,922
Unpaid losses and loss expenses recoverable at end of year	134,323	142,037	151,963
Gross unpaid losses and loss expenses at end of year	$ 212,101	$ 226,112	$ 252,885