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Reinsurance Ceded - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Ceded Credit Risk [Line Items]
Ceded premiums earned	$ 82,100	$ 84,300	$ 178,100	$ 169,800
Ceded losses incurred	$ 53,100	$ 61,100	$ 127,700	$ 113,400
Percentage of reinsurance recoverable of 20 largest reinsurers			74.30%

Amounts for the processing of insurance claims, such as legal fees and estimator fees that have been assumed by and are receivable from the identified reinsurer with respect to disclosure of a concentration of credit risk.

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- Definition

Premiums assumed and earned by another insurer as a result of reinsurance arrangements.

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