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v3.19.1

Summary of Significant Accounting Policies - Service Maintenance Agreements (Details) | 3 Months Ended
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Mar. 31, 2019
Summary of Significant Accounting Policies |
The term of the renewable service maintenance agreements (in years) | 1 year

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- Definition The term of renewable service maintenance agreements in years. + References No definition available. + Details
Name: | fix_RenewableServiceMaintenanceAgreementsTerm
Namespace Prefix: | fix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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