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Commitments and Contingencies - Other and Bonds (Details) - Surety	6 Months Ended
	Jun. 30, 2019
Minimum
Surety
Percentage of business which has required bonds	20.00%
Maximum
Surety
Percentage of business which has required bonds	30.00%

X

- References

No definition available.

+ Details

Name:	fix_LossContingencySuretyAbstract
Namespace Prefix:	fix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of business which has required bonds.

+ References

No definition available.

+ Details

Name:	fix_PercentageOfBusinessWhichHasRequiredBonds
Namespace Prefix:	fix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: