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Commitments and Contingencies - Self-Insurance (Details)	Dec. 31, 2025 USD ($)
Commitments and Contingencies
Per occurrences for losses	$ 500,000

X

- Definition

Amount retained per occurrence of loss pursuant to self insurance.

+ References

No definition available.

+ Details

Name:	fix_SelfInsuranceAmountRetainedPerOccurrenceOfLoss
Namespace Prefix:	fix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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