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v3.19.3.a.u2

Commitments and Contingencies - Other and Bonds (Details) - Surety | 12 Months Ended
--- | ---
Dec. 31, 2019
Minimum |
Surety |
Percentage of business which has required bonds | 15.00%
Maximum |
Surety |
Percentage of business which has required bonds | 25.00%

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: |