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Schedule of Liability for Unpaid Losses and Loss Adjustment Expenses (Parenthetical) (Detail) (Chaucer Business, USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Chaucer Business
Liabilities For Outstanding Claims, Losses And Loss Adjustment Expenses [Line Items]
Purchase of Chaucer, reinsurance recoverable on unpaid losses	$ 669.6

The sum for all reinsurance arrangements of the known and estimated amount recoverable as of the balance sheet date from a given reinsurer for claims paid or incurred by the ceding insurer and associated claims settlement expenses for each reinsurance arrangement (or, the sum of all cases determined individually, probably applying different assumptions to each arrangement).

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