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Business and Organization (Details) | 9 Months Ended
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Sep. 30, 2018
Installation of systems in newly constructed facilities |
Business and Organization |
Percentage of revenue attributable to services | 37.60%
Maintenance, repair and replacement services |
Business and Organization |
Percentage of revenue attributable to services | 62.40%

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- Definition The percentage of net services revenue to total net revenue from the services rendered as of the year end. + References No definition available. + Details
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Namespace Prefix: | fix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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