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INVESTMENTS (DETAILS 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Investment Income [Line Items]
Gross investment income	$ 99,883axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents	$ 93,080axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents
Investment expenses	(7,773)us-gaap_InvestmentIncomeInvestmentExpense	(10,336)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income	92,110axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents	82,744axs_InvestmentIncomeNetForInvestmentsAndCashAndCashEquivalents
Fixed Maturities [Member]
Net Investment Income [Line Items]
Gross investment income	66,101axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	72,957axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Other Investments [Member]
Net Investment Income [Line Items]
Gross investment income	30,935axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember	16,760axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = axs_AlternativeInvestmentsMember
Equity Securities [Member]
Net Investment Income [Line Items]
Gross investment income	1,676axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	2,286axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Cash And Cash Equivalents [Member]
Net Investment Income [Line Items]
Gross investment income	1,102axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	863axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Short-term Investments [Member]
Net Investment Income [Line Items]
Gross investment income	$ 69axs_InvestmentIncomeForInvestmentsAndCashAndCashEquivalents / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	$ 214axs_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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- 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, net of investment expense.

+ References

No definition available.

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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

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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