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Investment Information - Restricted assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Restricted Assets [Line Items] |  |
Restricted assets | $ 8,138,636 | $ 8,733,309
Collateral or guarantees - affiliated transactions |  |
Restricted Assets [Line Items] |  |
Restricted assets | 4,271,208 | 4,643,334
Collateral or guarantees - third party agreements |  |
Restricted Assets [Line Items] |  |
Restricted assets | 2,594,053 | 3,083,324
Deposits with US regulatory authorities |  |
Restricted Assets [Line Items] |  |
Restricted assets | 803,878 | 827,552
Deposits with non-US regulatory authorities |  |
Restricted Assets [Line Items] |  |
Restricted assets | $ 469,497 | $ 179,099

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- Definition Assets, consisting primarily of fixed maturities, that the Company is required to maintain with various regulatory authorities to support its insurance and reinsurance operations. The Company's insurance and reinsurance subsidiaries maintain assets in trust accounts as collateral for insurance and reinsurance transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties. + References No definition available. + Details
Name: | acgl_RestrictedAssets
Namespace Prefix: | acgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | acgl_RestrictedAssetsLineItems
Namespace Prefix: | acgl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | acgl_RestrictedAssetsRestrictionTypeAxis=acgl_CollateralOrGuaranteesAffiliatedTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | acgl_RestrictedAssetsRestrictionTypeAxis=acgl_CollateralOrGuaranteesThirdPartyAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | acgl_RestrictedAssetsRestrictionTypeAxis=acgl_DepositsWithUsRegulatoryAuthoritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | acgl_RestrictedAssetsRestrictionTypeAxis=acgl_DepositsWithNonUsRegulatoryAuthoritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |