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Reinsurance - Reinsurance Arrangements (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reinsurance Disclosures [Abstract]                      
Direct premiums written                 $ 789,577us-gaap_DirectPremiumsWritten $ 783,894us-gaap_DirectPremiumsWritten $ 780,128us-gaap_DirectPremiumsWritten
Ceded premiums written                 (399,730)us-gaap_CededPremiumsWritten (522,116)us-gaap_CededPremiumsWritten (517,604)us-gaap_CededPremiumsWritten
Net premiums written                 389,847us-gaap_PremiumsWrittenNet 261,778us-gaap_PremiumsWrittenNet 262,524us-gaap_PremiumsWrittenNet
Direct Premiums Earned                 777,317us-gaap_DirectPremiumsEarned 788,477us-gaap_DirectPremiumsEarned 751,899us-gaap_DirectPremiumsEarned
Ceded Premiums Earned                 (450,440)us-gaap_CededPremiumsEarned (520,822)us-gaap_CededPremiumsEarned (520,779)us-gaap_CededPremiumsEarned
Premiums earned, net 95,420us-gaap_PremiumsEarnedNet 94,288us-gaap_PremiumsEarnedNet 73,362us-gaap_PremiumsEarnedNet 63,807us-gaap_PremiumsEarnedNet 66,452us-gaap_PremiumsEarnedNet 68,927us-gaap_PremiumsEarnedNet 66,867us-gaap_PremiumsEarnedNet 65,409us-gaap_PremiumsEarnedNet 326,877us-gaap_PremiumsEarnedNet 267,655us-gaap_PremiumsEarnedNet 231,120us-gaap_PremiumsEarnedNet
Direct Losses and Loss Adjustment Expenses                 199,181us-gaap_PolicyholderBenefitsAndClaimsIncurredGross 216,852us-gaap_PolicyholderBenefitsAndClaimsIncurredGross 249,064us-gaap_PolicyholderBenefitsAndClaimsIncurredGross
Ceded Losses and Loss Adjustment Expenses                 (75,906)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded (108,237)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded (122,877)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Net Losses and Loss Adjustment Expenses                 $ 123,275us-gaap_PolicyholderBenefitsAndClaimsIncurredNet $ 108,615us-gaap_PolicyholderBenefitsAndClaimsIncurredNet $ 126,187us-gaap_PolicyholderBenefitsAndClaimsIncurredNet