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Reinsurance - Additional Information (Detail) (USD $) In Billions, unless otherwise specified | 6 Months Ended | 9 Months Ended
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Jun. 30, 2012 | Sep. 30, 2013
Reinsurance Disclosures [Abstract] |  |
In-force policyholder coverage for windstorm exposures |  | $ 122.8
Percentage of premium ceded | 50.00% | 45.00%
Percentage reduction of premium ceded |  | 5.00%

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- Details
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- Definition In force policyholder coverage for windstorm exposures. + References No definition available. + Details
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- Definition Percentage reduction of premium ceded. + References No definition available. + Details
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