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Revenue from Contracts with Customers - Narratives (Details) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Revenue from Contracts with Customers |  |
Percentage impact on revenue from performance obligations satisfied in previous period | 4.10% | 2.20%

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- Definition Percentage of revenue attributable to performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References No definition available. + Details
Name: | fix_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriodPercentage
Namespace Prefix: | fix_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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