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Reinsurance Balances Recoverable - Reinsurance Balances Recoverable (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Reinsurance [Line Items]
% of Total	100.00%	100.00%
Reinsurance recoverable	$ 1,246,307	$ 1,789,582
Top 10 Reinsurers [Member]
Reinsurance [Line Items]
% of Total	68.00%	70.00%
Reinsurance recoverable	846,960	1,252,929
Other reinsurers' balances greater than $1 million [Member]
Reinsurance [Line Items]
% of Total	31.60%	29.70%
Reinsurance recoverable	394,707	532,303
Other reinsurers' balances less than $1 million [Member]
Reinsurance [Line Items]
% of Total	0.40%	0.30%
Reinsurance recoverable	$ 4,640	$ 4,350

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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