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Income Taxes (Details2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes
Income tax expense at the statutory rate of 35%	$ 14,080us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 16,373us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 7,539us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Changes resulting from-
State income taxes, net of federal tax effect	1,653us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,910us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,011us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Increase (decrease) in valuation allowance	(1,944)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1,465us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	455us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Increase (decrease) in tax contingency reserves	(40)us-gaap_IncomeTaxReconciliationTaxContingencies	(145)us-gaap_IncomeTaxReconciliationTaxContingencies	198us-gaap_IncomeTaxReconciliationTaxContingencies
Increase (decrease) from noncontrolling interests	(1,938)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense	(450)us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense	565us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense
Non-deductible expenses	704us-gaap_IncomeTaxReconciliationNondeductibleExpense	594us-gaap_IncomeTaxReconciliationNondeductibleExpense	481us-gaap_IncomeTaxReconciliationNondeductibleExpense
Production activity deduction	(694)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(520)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(378)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Purchase accounting adjustments	(46)fix_IncomeTaxReconciliationPurchaseAccountingAdjustments	(472)fix_IncomeTaxReconciliationPurchaseAccountingAdjustments	(210)fix_IncomeTaxReconciliationPurchaseAccountingAdjustments
Other	(161)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(607)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	384us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Provision for income taxes	$ 11,614us-gaap_IncomeTaxExpenseBenefit	$ 18,148us-gaap_IncomeTaxExpenseBenefit	$ 10,045us-gaap_IncomeTaxExpenseBenefit

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to purchase accounting adjustments in the period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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