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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

X

- Definition

Multiemployer Plan, Employer Contributions

+ References

No definition available.

+ Details

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Namespace Prefix:	aca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration