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v2.4.1.9

Supplemental Financial Information (Consolidating Statements of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (95,709)us-gaap_NetIncomeLoss | $ 9,540 us-gaap_NetIncomeLoss | $ 6,431 us-gaap_NetIncomeLoss | $ (2,086)us-gaap_NetIncomeLoss | $ 4,009 us-gaap_NetIncomeLoss | $ (13,727)us-gaap_NetIncomeLoss | $ 7,732 us-gaap_NetIncomeLoss | $ (3,647)us-gaap_NetIncomeLoss | $ (81,824)us-gaap_NetIncomeLoss | $ (5,633)us-gaap_NetIncomeLoss | $ 12,645 us-gaap_NetIncomeLoss
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (4,364)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | (2,108)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 2,353 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | (24)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 | 53 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 | (79)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | (1,435)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 45 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (499)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | (143)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | (5,966)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (2,010)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 1,775 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive (loss) income |  |  |  |  |  |  |  |  | (87,790)us-gaap_ComprehensiveIncomeNetOfTax | (7,643)us-gaap_ComprehensiveIncomeNetOfTax | 14,420 us-gaap_ComprehensiveIncomeNetOfTax
Gibraltar Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (80,650)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,864)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13,614 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total comprehensive (loss) income |  |  |  |  |  |  |  |  | (80,650)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,864)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13,614 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | (71,191)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,041 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 24,535 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 3 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 53 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (79)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | (1,435)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 45 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (499)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | (143)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | (1,575)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 98 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (578)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Total comprehensive (loss) income |  |  |  |  |  |  |  |  | (72,766)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,139 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 23,957 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | 2,929 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (19,351)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 3,960 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (4,364)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2,108)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,353 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | (27)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | (4,391)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2,108)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,353 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Total comprehensive (loss) income |  |  |  |  |  |  |  |  | (1,462)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (21,459)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 6,313 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  | 67,088 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 9,541 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (29,464)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Total comprehensive (loss) income |  |  |  |  |  |  |  |  | $ 67,088 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 9,541 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (29,464)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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