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Commitments and Contingencies (Details 3) (USD $) | Dec. 31, 2012
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Workers Compensation |
Self-Insurance |
Per incident deductible amount | $ 500,000
Amount of loss fully insured above per incident deductible amount. | 500,000
Employer's Liability, General Liability and Auto Liability | Maximum |
Self-Insurance |
Amount of excess loss insurance covered | 100,000,000
Employer's Liability |
Self-Insurance |
Per incident deductible amount | 500,000
Amount of loss fully insured above per incident deductible amount. | 500,000
General Liability |
Self-Insurance |
Per incident deductible amount | 500,000
Amount of loss fully insured above per incident deductible amount. | 1,500,000
Auto Liability |
Self-Insurance |
Per incident deductible amount | 500,000
Amount of loss fully insured above per incident deductible amount. | 1,500,000
Employee Medical |
Self-Insurance |
Number of medical plans | 2
Employee Medical- Plan One |
Self-Insurance |
Per person, per policy deductible amount | 300,000
Employee Medical- Plan Two |
Self-Insurance |
Per person, per policy deductible amount | $ 300,000

X
- Definition Represents the amount of aggregate excess loss coverage above applicable per-incident deductibles for all lines of risk. + References No definition available. + Details
Name: | fix_SelfInsuranceAggregateLossInsuranceCoveredAmount
Namespace Prefix: | fix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of loss fully insured above per incident deductible amount under insurance arrangements under various risks. + References No definition available. + Details
Name: | fix_SelfInsuranceAmountOfLossFullyInsuredAboveDeductibleCoverageAmount
Namespace Prefix: | fix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of risk retained by the entity per incident before the insurance arrangement begins to provide coverage under various risks. + References No definition available. + Details
Name: | fix_SelfInsuranceDeductibleAmountPerIncident
Namespace Prefix: | fix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of risk retained by the entity per person, per policy before the insurance arrangement begins to provide coverage under various risks. + References No definition available. + Details
Name: | fix_SelfInsuranceDeductibleAmountPerPersonPerPolicy
Namespace Prefix: | fix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of medical plans. + References No definition available. + Details
Name: | fix_SelfInsuranceNumberOfMedicalPlans
Namespace Prefix: | fix_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration