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Reinsurance - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Reinsurance Disclosures [Abstract]
In-force policyholder coverage for windstorm exposures	$ 124.8
Percentage of premium ceded	45.00%	50.00%
Percentage reduction of premium ceded	5.00%

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In force policyholder coverage for windstorm exposures.

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Percentage of premium ceded.

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Percentage reduction of premium ceded.

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