2.2.0.25truefalse04210 - Disclosure - Segment Information (Details)truefalseIn Thousands, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) $FROM_Jan01_2011_TO_Mar31_2011http://www.sec.gov/CIK0000911421duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) $FROM_Jan01_2010_TO_Mar31_2010http://www.sec.gov/CIK0000911421duration2010-01-01T00:00:002010-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0pre_SegmentReportingLineItemsprefalsenadurationNo definition 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written.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-405830000-405830falsefalsefalsefalsefalse2truefalsefalse-630386000-630386falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryChange during the period in the unearned gross premiums written (direct and assumed) and ceded premiums written.No authoritative reference available.falsefalseIncrease in unearned premiums6false0us-gaap_PremiumsEarnedNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse10645890001064589falsefalsefalsefalsefalse2truefalsefalse11537790001153779falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPremiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b truefalseNet premiums earned7false0pre_LossesAndLossExpensesAndLifePolicyBenefitsSegmentDisclosureprefalsedebitdurationProvision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-1608000000-1608000falsefalsefalsefalsefalse2truefalsefalse-1013000000-1013000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryProvision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts assumed and ceded, by segment and subsegment.No authoritative reference available.falsefalseLosses and loss expenses and life policy benefits8false0us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-207849000-207849falsefalsefalsefalsefalse2truefalsefalse-220107000-220107falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 22, 23, 24, 25, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16, 18 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 95-1 -Paragraph 19, 20, 21, 22, 23 falsefalseAcquisition costs9false0us-gaap_GrossProfitus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-751000000-751000falsefalsefalsefalsefalse2truefalsefalse-79000000-79000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.No authoritative reference available.truefalseTechnical result10false0us-gaap_OtherIncomeus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse18130001813falsefalsefalsefalsefalse2truefalsefalse12740001274falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 falsefalseOther income11false0us-gaap_OtherExpensesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-104297000-104297falsefalsefalsefalsefalse2truefalsefalse-128134000-128134falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents a sum total of expenses not separately reflected on the income statement for the period.No authoritative reference available.falsefalseOther operating expenses12false0pre_UnderwritingResultprefalsecreditdurationUnderwriting result is defined as the technical result net of other operating income and expenses.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-853000000-853000falsefalsefalsefalsefalse2truefalsefalse-206000000-206000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnderwriting result is defined as the technical result net of other operating income and expenses.No authoritative reference available.truefalseUnderwriting result13false0us-gaap_InvestmentIncomeNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse151633000151633falsefalsefalsefalsefalse2truefalsefalse173122000173122falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 13, 14, 15, 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14, 16 falsefalseNet investment income (loss)14false0us-gaap_GainLossOnInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-112199000-112199falsefalsefalsefalsefalse2truefalsefalse145474000145474falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or loss which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments of the subject investments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 falsefalseNet realized and unrealized investment (losses) gains15false0us-gaap_InterestExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-12300000-12300falsefalsefalsefalsefalse2truefalsefalse-7132000-7132falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cost of borrowed funds accounted for as interest that was charged against earnings during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 falsefalseInterest expense16false0us-gaap_AmortizationOfIntangibleAssetsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-8827000-8827falsefalsefalsefalsefalse2truefalsefalse-4803000-4803falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) falsefalseAmortization of intangible assets17false0us-gaap_ForeignCurrencyTransactionGainLossBeforeTaxus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse695000695falsefalsefalsefalsefalse2truefalsefalse36270003627falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains or losses may be disclosed as dealer gains or losses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 falsefalseNet foreign exchange gains18false0us-gaap_IncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse2625800026258falsefalsefalsefalsefalse2truefalsefalse-27554000-27554falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b falsefalseIncome tax benefit (expense)19false0us-gaap_IncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse745000745falsefalsefalsefalsefalse2truefalsefalse24450002445falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. 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If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseSegment Reporting [Line Items]24false0us-gaap_AssumedPremiumsWrittenus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse208000000208000falsefalsefalsefalsefalse2truefalsefalse187000000187000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPremiums for all insurance assumed from other insurers, that is premiums ceded to the entity by other insurers.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b falsefalseGross premiums written25false0us-gaap_PremiumsWrittenNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse206000000206000falsefalsefalsefalsefalse2truefalsefalse183000000183000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPremiums written for all insurance and reinsurance contracts, after adding premiums assumed from other insurers and subtracting any amounts ceded to another insurer.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 Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b falsefalseNet premiums written26false0pre_ChangeInUnearnedPremiumsprefalsecreditdurationChange during the period in the unearned gross premiums written (direct and assumed) and ceded premiums written.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-22000000-22000falsefalsefalsefalsefalse2truefalsefalse-18000000-18000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryChange during the period in the unearned gross premiums written (direct and assumed) and ceded premiums written.No authoritative reference available.falsefalseIncrease in unearned premiums27false0us-gaap_PremiumsEarnedNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse184000000184000falsefalsefalsefalsefalse2truefalsefalse165000000165000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPremiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b truefalseNet premiums earned28false0pre_LossesAndLossExpensesAndLifePolicyBenefitsSegmentDisclosureprefalsedebitdurationProvision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-145000000-145000falsefalsefalsefalsefalse2truefalsefalse-132000000-132000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryProvision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts assumed and ceded, by segment and subsegment.No authoritative reference available.falsefalseLosses and loss expenses and life policy benefits29false0us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-30000000-30000falsefalsefalsefalsefalse2truefalsefalse-23000000-23000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 22, 23, 24, 25, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16, 18 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 95-1 -Paragraph 19, 20, 21, 22, 23 falsefalseAcquisition costs30false0us-gaap_GrossProfitus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse90000009000falsefalsefalsefalsefalse2truefalsefalse1000000010000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.No authoritative reference available.truefalseTechnical result31false0us-gaap_OtherIncomeus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse00falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 falsefalseOther income32false0us-gaap_OtherExpensesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-12000000-12000falsefalsefalsefalsefalse2truefalsefalse-14000000-14000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents a sum total of expenses not separately reflected on the income statement for the period.No authoritative reference available.falsefalseOther operating expenses33false0pre_UnderwritingResultprefalsecreditdurationUnderwriting result is defined as the technical result net of other operating income and expenses.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-3000000-3000falsefalsefalsefalsefalse2truefalsefalse-4000000-4000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryUnderwriting result is defined as the technical result net of other operating income and expenses.No authoritative reference available.truefalseUnderwriting result34false0us-gaap_InvestmentIncomeNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1500000015000falsefalsefalsefalsefalse2truefalsefalse1600000016000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 13, 14, 15, 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14, 16 falsefalseNet investment income (loss)35false0pre_AllocatedUnderwritingResultprefalsecreditdurationThis element is defined as net premiums earned, other income or loss and allocated net investment income less life policy...falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse1200000012000falsefalsefalsefalsefalse2truefalsefalse1200000012000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element is defined as net premiums earned, other income or loss and allocated net investment income less life policy benefits, acquisition costs and other operating expenses for Life segment.No authoritative reference available.truefalseAllocated underwriting result37false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.partnerre.com/role/disclosuresegmentinformationdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{us-gaap_StatementBusinessSegmentsAxis} : Corporate And Other [Member] 1/1/2011 - 3/31/2011 USD ($) 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-Paragraph 60 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 95-1 -Paragraph 19, 20, 21, 22, 23 falsefalseAcquisition costs45false0us-gaap_GrossProfitus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse00falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.No authoritative reference available.truefalseTechnical result46false0us-gaap_OtherIncomeus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse10000001000falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the sum of all other revenue and income recognized by the 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse137000000137000falsefalsefalsefalsefalse2truefalsefalse157000000157000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 13, 14, 15, 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14, 16 falsefalseNet investment income (loss)49false0us-gaap_GainLossOnInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-112000000-112000falsefalsefalsefalsefalse2truefalsefalse146000000146000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or loss which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. 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statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b truefalseNet premiums earned119false0pre_LossesAndLossExpensesAndLifePolicyBenefitsSegmentDisclosureprefalsedebitdurationProvision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-918000000-918000falsefalsefalsefalsefalse2truefalsefalse-153000000-153000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryProvision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts assumed and ceded, by segment and subsegment.No authoritative reference available.falsefalseLosses and loss expenses and life policy benefits120false0us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse80000008000falsefalsefalsefalsefalse2truefalsefalse-12000000-12000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 22, 23, 24, 25, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16, 18 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 95-1 -Paragraph 19, 20, 21, 22, 23 falsefalseAcquisition costs121false0us-gaap_GrossProfitus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-786000000-786000falsetruefalsefalsefalse2truefalsefalse-11000000-11000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.No authoritative reference available.truefalseTechnical result122true0pre_ReinsuranceRatiosAbstractprefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseReinsurance Ratios [Abstract]123false0pre_LossRatioPercentageprefalsenadurationThe loss ratio is obtained by dividing losses and loss expenses by net premiums earned.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse7.4307.430falsefalsefalsefalsefalse2truetruefalse0.9900.990falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe loss ratio is obtained by dividing losses and loss expenses by net premiums earned.No authoritative reference available.falsefalseLoss ratio124false0pre_AcquisitionRatioPercentageprefalsenadurationThe acquisition ratio is obtained by dividing acquisition costs by net premiums earned.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse-0.067-0.067falsefalsefalsefalsefalse2truetruefalse0.0790.079falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe acquisition ratio is obtained by dividing acquisition costs by net premiums earned.No authoritative reference available.falsefalseAcquisition ratio125false0pre_TechnicalRatioPercentageprefalsenadurationTechnical ratio is defined as the sum of the loss ratio and the acquisition ratio.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse7.3637.363falsefalsefalsefalsefalse2truetruefalse1.0691.069falsefalsefalsefalsefalseOtherus-types:percentItemTypepureTechnical ratio is defined as the sum of the loss ratio and the acquisition ratio.No authoritative reference available.falsefalseTechnical ratio2121Segment Information (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruetrue