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Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Retirement Benefits [Abstract] |  |  |  |
Contributions to the multiemployer plan | $ 0.4 | $ 0.4 | $ 1.1 | $ 1.2
Expected full year contributions by the employer to the multiemployer plan | $ 1.5 |  | $ 1.5 |

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- Definition Multiemployer Plan, Employer Contributions + References No definition available. + Details
Name: | aca_MultiemployerPlanEmployerContributions
Namespace Prefix: | aca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Multiemployer Plan, Expected Contributions in Current Fiscal Year + References No definition available. + Details
Name: | aca_MultiemployerPlanExpectedContributionsinCurrentFiscalYear
Namespace Prefix: | aca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration