XML 72 R47.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Summary of Significant Accounting Policies - Unsatisfied Performance Obligations (Details) $ in Millions | Dec. 31, 2024 USD ($)
--- | ---
Utility, wind, and related structures | Engineered Structures |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Unsatisfied performance obligations, Amount | $ 1,190.8
Percent expected to be delivered in 2025 | 64.00%
Percent expected to be delivered in 2026 | 13.00%
Inland barges | Transportation Products |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Unsatisfied performance obligations, Amount | $ 280.1
Percent expected to be delivered in 2025 | 92.00%

X
- Definition Revenue Remaining Performance Obligation Percentage Year 1 + References No definition available. + Details
Name: | aca_RevenueRemainingPerformanceObligationPercentageYear1
Namespace Prefix: | aca_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revenue Remaining Performance Obligation Percentage Year 2 + References No definition available. + Details
Name: | aca_RevenueRemainingPerformanceObligationPercentageYear2
Namespace Prefix: | aca_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=aca_UtilityWindAndRelatedStructuresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=aca_EngineeredStructuresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aca_InlandBargeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=aca_TransportationProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |