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Reinsurance Balances Recoverable - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Reinsurance [Line Items]
Reinsurance recoverable	$ 1,246,307,000		$ 1,789,582,000
Reinsurance balance recoverable	(543,427,000)	(88,289,000)
Provision for uncollectible reinsurance recoverable relating to total reinsurance recoverable	344,900,000		341,100,000
Ratio of provision for uncollectible reinsurance recoverable to reinsurance balances receivable	21.70%		16.00%
Percentage of top ten reinsurers reinsurance recoverable	100.00%		100.00%
Losses incured but not reported	515,435,000		678,437,000
Top 10 Reinsurers [Member]
Reinsurance [Line Items]
Reinsurance recoverable	846,960,000		1,252,929,000
Percentage of top ten reinsurers reinsurance recoverable	68.00%		70.00%
Losses incured but not reported	374,200,000		451,300,000
Top 10 Reinsurers [Member] \| BBB or lower [Member]
Reinsurance [Line Items]
Reinsurance recoverable	44,900,000		55,200,000
One reinsurer accounting for more than 10 % of total reinsurance balances receivable [Member]
Reinsurance [Line Items]
Reinsurance recoverable	208,100,000		235,800,000
Reinsurance Receivables Secured By Trust Fund	$ 151,700,000
Reinsurance recoverable major reinsurer	10.00%

The portion of reinsurance receivables representing the aggregate amount of estimated amounts due as of the balance sheet date from another insurer; also called reinsurance recoverables or unpaid losses recoverable, that are expected based upon statistical projections of incurred claims and claims settlement expenses which have not yet been reported to the insurer.

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- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

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