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Reinsurance - Reinsurance Arrangements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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

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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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