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INVESTMENTS (DETAILS 5) (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
Net Investment Income [Line Items]
Gross investment income									$ 378,377axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents	$ 440,838axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents	$ 409,088axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents
Investment expenses									(35,611)us-gaap_InvestmentIncomeInvestmentExpense	(31,526)us-gaap_InvestmentIncomeInvestmentExpense	(28,131)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income	78,595axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	66,562axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	114,867axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	82,744axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	113,863axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	103,429axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	83,112axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	108,908axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	342,766axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	409,312axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	380,957axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents
Fixed Maturities [Member]
Net Investment Income [Line Items]
Gross investment income									296,663axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	293,609axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	304,400axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Other Investments [Member]
Net Investment Income [Line Items]
Gross investment income									57,621axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember	128,814axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember	87,660axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember
Equity Securities [Member]
Net Investment Income [Line Items]
Gross investment income									11,832axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	10,897axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	11,904axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Cash And Cash Equivalents [Member]
Net Investment Income [Line Items]
Gross investment income									11,536axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	6,337axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	4,528axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Short-term Investments [Member]
Net Investment Income [Line Items]
Gross investment income									$ 725axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	$ 1,181axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	$ 596axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember

X

- Definition

The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium), of interest income and dividend income on nonoperating securities.

+ References

No definition available.

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+ References

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- Definition

Amount of expenses related to the generation of investment income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Paragraph 2

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