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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseRelated Party Transaction [Line Items]3false0pre_RelatedPartyTransactionNetPremiumsWrittenprefalsecreditdurationThis element represents the amount of net premiums written with related parties.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse8097500080975falsetruefalsefalsefalse2truefalsefalse4948700049487falsetruefalsefalsefalse3truefalsefalse6729500067295falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amount of net premiums written with related parties.No authoritative reference available.falsefalseNet premiums written4false0pre_RelatedPartyTransactionNetPremiumsEarnedprefalsecreditdurationThis element represents the amount of net premiums earned with related parties.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse6909400069094falsefalsefalsefalsefalse2truefalsefalse6372400063724falsefalsefalsefalsefalse3truefalsefalse6525200065252falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amount of net premiums earned with related parties.No authoritative reference available.falsefalseNet premiums earned5false0pre_RelatedPartyTransactionLossesLossExpensesAndLifePolicyBenefitsprefalsedebitdurationThis element represents the amount of losses and loss expenses and life policy benefits incurred with related parties.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse4074000040740falsefalsefalsefalsefalse2truefalsefalse5839400058394falsefalsefalsefalsefalse3truefalsefalse4209600042096falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amount of losses and loss expenses and life policy benefits incurred with related parties.No authoritative reference available.falsefalseLosses and loss expenses and life policy benefits6false0pre_RelatedPartyTransactionAcquisitionCostsprefalsedebitdurationThis element represents the amount of acquisition costs expensed with related partiesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2201200022012falsefalsefalsefalsefalse2truefalsefalse2082400020824falsefalsefalsefalsefalse3truefalsefalse2553300025533falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amount of acquisition costs expensed with related partiesNo authoritative reference available.falsefalseAcquisition costs7false0pre_RelatedPartyReinsuranceBalancesReceivableprefalsedebitinstantThis element represents the amounts due from related parties that are included in Reinsurance Balances Receivable in the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2157100021571falsefalsefalsefalsefalse2truefalsefalse2332000023320falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amounts due from related parties that are included in Reinsurance Balances Receivable in the Consolidated Balance Sheets of the Company.No authoritative reference available.falsefalseReinsurance balances receivable8false0pre_RelatedPartyUnpaidLossesAndLossExpensesprefalsecreditinstantThis element represents the amounts with related parties that are included in Unpaid Losses and Loss Expenses in the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse7192900071929falsefalsefalsefalsefalse2truefalsefalse130505000130505falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amounts with related parties that are included in Unpaid Losses and Loss Expenses in the Consolidated Balance Sheets of the Company.No authoritative reference available.falsefalseUnpaid losses and loss expenses9false0pre_RelatedPartyUnearnedPremiumsprefalsecreditinstantThis element represents the amounts with related parties that are included in Unearned Premiums in the Consolidated Balance...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse3674400036744falsefalsefalsefalsefalse2truefalsefalse2753400027534falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amounts with related parties that are included in Unearned Premiums in the Consolidated Balance Sheets of the Company.No authoritative reference available.falsefalseUnearned premiums10false0pre_RelatedPartyOtherNetAssetsprefalsedebitinstantThis element represents the amount with related parties in Other assets, net in the Consolidated Balance Sheets of 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[Member]us-gaap_RelatedPartyTransactionsByRelatedPartyAxisxbrldihttp://xbrl.org/2006/xbrldipre_DeltaLloydMemberus-gaap_RelatedPartyTransactionsByRelatedPartyAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_RelatedPartyTransactionsByRelatedPartyAxis} : Delta Lloyd [Member] 1/1/2008 - 12/31/2008 USD ($) $FROM_Jan01_2008_TO_Dec31_2008_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_DeltaLloydMemberhttp://www.sec.gov/CIK0000911421duration2008-01-01T00:00:002008-12-31T00:00:00falsefalseDelta Lloyd [Member]us-gaap_RelatedPartyTransactionsByRelatedPartyAxisxbrldihttp://xbrl.org/2006/xbrldipre_DeltaLloydMemberus-gaap_RelatedPartyTransactionsByRelatedPartyAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseDelta Lloyd [Member]12true0us-gaap_RelatedPartyTransactionLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseRelated Party Transaction [Line Items]13false0pre_RelatedPartyTransactionNetPremiumsEarnedprefalsecreditdurationThis element represents the amount of net premiums earned with related parties.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse12000001200falsefalsefalsefalsefalse2truefalsefalse14000001400falsefalsefalsefalsefalse3truefalsefalse18000001800falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amount of net premiums earned with related parties.No authoritative reference available.falsefalseNet premiums earned14false0pre_RelatedPartyTransactionLossesLossExpensesAndLifePolicyBenefitsprefalsedebitdurationThis element represents the amount of losses and loss expenses and life policy benefits incurred with related parties.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse300000300falsefalsefalsefalsefalse2truefalsefalse500000500falsefalsefalsefalsefalse3truefalsefalse12000001200falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amount of losses and loss expenses and life policy benefits incurred with related parties.No authoritative reference available.falsefalseLosses and loss expenses and life policy benefits15false0pre_RelatedPartyUnpaidLossesAndLossExpensesprefalsecreditinstantThis element represents the amounts with related parties that are included in Unpaid Losses and Loss Expenses in the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse89000008900falsetruefalsefalsefalse2truefalsefalse85000008500falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the amounts with related parties that are included in Unpaid Losses and Loss Expenses in the Consolidated Balance Sheets of the Company.No authoritative reference available.falsefalseUnpaid losses and loss expenses315Agreements with Related Parties (Details) (USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue