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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash paid for:    
Interest $ 407us-gaap_InterestPaid $ 261us-gaap_InterestPaid
Income taxes for continuing operations 590fix_IncomeTaxesPaidContinuingOperations 519fix_IncomeTaxesPaidContinuingOperations
Total 997fix_InterestPaidAndIncomeTaxesPaid 780fix_InterestPaidAndIncomeTaxesPaid
Income Taxes    
Tax expense $ 3,793us-gaap_IncomeTaxExpenseBenefit $ 692us-gaap_IncomeTaxExpenseBenefit
Effective tax rate (as a percent) 35.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Federal statutory income taxes rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes rate (as a percent) 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Percent 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization  
Noncontrolling interest (as a percent) 2.70%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense  
Production activity deduction (as a percent) 1.80%fix_ProductionActivityDeduction