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INCOME TAXES (DETAILS 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation allowance movement [Line Items]
Valuation allowance, end of year	$ 34,094us-gaap_DeferredTaxAssetsValuationAllowance	$ 25,542us-gaap_DeferredTaxAssetsValuationAllowance
Income Tax Expense [Member]
Valuation allowance movement [Line Items]
Valuation allowance, beginning of year			33,933us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Valuation allowance, end of year	34,865us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	27,070us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	33,933us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Income Tax Expense [Member] | Operating Loss Carryforwards [Member]
Valuation allowance movement [Line Items]
Change in valuation allowance	3,044us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember	(794)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember
Income Tax Expense [Member] | Capital Loss Carryforwards [Member]
Valuation allowance movement [Line Items]
Change in valuation allowance	1,262us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_CapitalLossCarryforwardMember	0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_CapitalLossCarryforwardMember
Income Tax Expense [Member] | Foreign Tax Credit [Member]
Valuation allowance movement [Line Items]
Change in valuation allowance	3,194us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember	1,762us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember
Income Tax Expense [Member] | Australian CTA and accruals and rate differentials [Member]
Valuation allowance movement [Line Items]
Change in valuation allowance	1,052us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember	0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Income Tax Expense [Member] | Change in investment-related items [Member]
Valuation allowance movement [Line Items]
Change in valuation allowance	(757)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = axs_ValuationAllowanceInvestmentRelatedItemsMember	(7,831)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = axs_ValuationAllowanceInvestmentRelatedItemsMember
Accumulated Other Comprehensive Income [Member]
Valuation allowance movement [Line Items]
Valuation allowance, beginning of year			(9,359)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Valuation allowance, end of year	(771)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(1,528)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(9,359)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated Other Comprehensive Income [Member] | Change in investment-related items [Member]
Valuation allowance movement [Line Items]
Change in valuation allowance	$ 757us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = axs_ValuationAllowanceInvestmentRelatedItemsMember	$ 7,831us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = axs_ValuationAllowanceInvestmentRelatedItemsMember

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

+ Details

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X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

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- Details

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- Details

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X

- Details

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