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v2.4.1.9

Supplemental Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities of continuing operations | $ 32,583 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 60,304 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 50,232 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash used in operating activities of discontinued operations | (41)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | (9)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | (151)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities | 32,542 us-gaap_NetCashProvidedByUsedInOperatingActivities | 60,295 us-gaap_NetCashProvidedByUsedInOperatingActivities | 50,081 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities |  |  |
Other investing activities | 277 us-gaap_PaymentsToAcquireEquityMethodInvestments | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments
Cash paid for acquisitions, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (5,536)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (45,071)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchases of property, plant, and equipment | (23,291)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (14,940)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (11,351)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net proceeds from sale of property and equipment | 5,992 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 12,610 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 659 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities | (17,022)us-gaap_NetCashProvidedByUsedInInvestingActivities | (7,866)us-gaap_NetCashProvidedByUsedInInvestingActivities | (55,763)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities |  |  |
Long-term debt payments | (407)us-gaap_RepaymentsOfLongTermDebt | (205,094)us-gaap_RepaymentsOfLongTermDebt | (473)us-gaap_RepaymentsOfLongTermDebt
Proceeds from long-term debt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 210,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payment of deferred financing fees | (35)us-gaap_PaymentsOfFinancingCosts | (3,899)us-gaap_PaymentsOfFinancingCosts | (18)us-gaap_PaymentsOfFinancingCosts
Payment of note redemption fees | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts | (3,702)us-gaap_PaymentsOfDebtExtinguishmentCosts | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts
Purchase of treasury stock at market prices | (575)us-gaap_PaymentsForRepurchaseOfCommonStock | (714)us-gaap_PaymentsForRepurchaseOfCommonStock | (970)us-gaap_PaymentsForRepurchaseOfCommonStock
Intercompany financing | 0 rock_InterCompanyFinancing | 0 rock_InterCompanyFinancing | 0 rock_InterCompanyFinancing
Excess tax benefit from stock compensation | 100 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 72 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 10 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net proceeds from issuance of common stock | 595 us-gaap_ProceedsFromIssuanceOfCommonStock | 648 us-gaap_ProceedsFromIssuanceOfCommonStock | 278 us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash used in financing activities | (322)us-gaap_NetCashProvidedByUsedInFinancingActivities | (2,689)us-gaap_NetCashProvidedByUsedInFinancingActivities | (1,173)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash | (1,627)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (729)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 766 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents | 13,571 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 49,011 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (6,089)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 97,039 us-gaap_CashAndCashEquivalentsAtCarryingValue | 48,028 us-gaap_CashAndCashEquivalentsAtCarryingValue | 54,117 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 110,610 us-gaap_CashAndCashEquivalentsAtCarryingValue | 97,039 us-gaap_CashAndCashEquivalentsAtCarryingValue | 48,028 us-gaap_CashAndCashEquivalentsAtCarryingValue
Gibraltar Industries, Inc. |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities of continuing operations | (13,437)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9,023)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (16,435)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in operating activities of discontinued operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by operating activities | (13,437)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9,023)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (16,435)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Investing Activities |  |  |
Other investing activities | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash paid for acquisitions, net of cash acquired |  | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of property, plant, and equipment | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net proceeds from sale of property and equipment | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in investing activities | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Financing Activities |  |  |
Long-term debt payments | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (204,000)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from long-term debt |  | 210,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Payment of deferred financing fees | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,858)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payment of note redemption fees |  | (3,702)us-gaap_PaymentsOfDebtExtinguishmentCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Purchase of treasury stock at market prices | (575)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (714)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (970)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany financing | 13,317 rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,577 rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,116 rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Excess tax benefit from stock compensation | 100 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 72 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net proceeds from issuance of common stock | 595 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 648 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 278 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in financing activities | 13,437 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,023 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,435 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Effect of exchange rate changes on cash | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantor Subsidiaries |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities of continuing operations | 40,820 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 64,994 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 58,628 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash used in operating activities of discontinued operations | (41)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (9)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (151)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash provided by operating activities | 40,779 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 64,985 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 58,477 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash Flows from Investing Activities |  |  |
Other investing activities | 277 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cash paid for acquisitions, net of cash acquired |  | (5,536)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (42,366)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Purchases of property, plant, and equipment | (19,286)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (11,719)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (9,868)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net proceeds from sale of property and equipment | 5,989 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 12,592 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 311 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash used in investing activities | (13,020)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (4,663)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (51,923)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash Flows from Financing Activities |  |  |
Long-term debt payments | (407)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (1,094)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (473)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from long-term debt |  | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Payment of deferred financing fees | (35)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (41)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (18)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Payment of note redemption fees |  | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Purchase of treasury stock at market prices | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany financing | (11,707)rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (9,494)rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (14,590)rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Excess tax benefit from stock compensation | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (1)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net proceeds from issuance of common stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash used in financing activities | (12,149)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (10,629)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (15,082)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Effect of exchange rate changes on cash | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net increase (decrease) in cash and cash equivalents | 15,610 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 49,693 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (8,528)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents at beginning of year | 75,856 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 26,163 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 34,691 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents at end of year | 91,466 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 75,856 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 26,163 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash (used in) provided by operating activities of continuing operations | 5,200 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,333 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 8,039 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net cash used in operating activities of discontinued operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net cash provided by operating activities | 5,200 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,333 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 8,039 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash Flows from Investing Activities |  |  |
Other investing activities | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Cash paid for acquisitions, net of cash acquired |  | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2,705)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Purchases of property, plant, and equipment | (4,005)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3,221)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,483)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net proceeds from sale of property and equipment | 3 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 18 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 348 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net cash used in investing activities | (4,002)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3,203)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3,840)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash Flows from Financing Activities |  |  |
Long-term debt payments | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from long-term debt |  | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Payment of deferred financing fees | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Payment of note redemption fees |  | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Purchase of treasury stock at market prices | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Intercompany financing | (1,610)rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,083)rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2,526)rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Excess tax benefit from stock compensation | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net proceeds from issuance of common stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net cash used in financing activities | (1,610)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,083)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2,526)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Effect of exchange rate changes on cash | (1,627)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (729)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 766 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net increase (decrease) in cash and cash equivalents | (2,039)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (682)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,439 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents at beginning of year | 21,183 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,865 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 19,426 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents at end of year | 19,144 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,183 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,865 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Eliminations |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
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Net cash used in operating activities of discontinued operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net cash provided by operating activities | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash Flows from Investing Activities |  |  |
Other investing activities | 0 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Cash paid for acquisitions, net of cash acquired |  | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Purchases of property, plant, and equipment | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net proceeds from sale of property and equipment | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net cash used in investing activities | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash Flows from Financing Activities |  |  |
Long-term debt payments | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Proceeds from long-term debt |  | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Payment of deferred financing fees | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Payment of note redemption fees |  | 0 us-gaap_PaymentsOfDebtExtinguishmentCosts / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Purchase of treasury stock at market prices | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Intercompany financing | 0 rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 rock_InterCompanyFinancing / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Excess tax benefit from stock compensation | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net proceeds from issuance of common stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net cash used in financing activities | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Effect of exchange rate changes on cash | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net increase (decrease) in cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents at beginning of year | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash and cash equivalents at end of year | $ 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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