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Consolidated Statements of Comprehensive Income (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
Other Comprehensive Income (Loss), Net of Tax [Abstract]                      
Net (loss) income $ (95,709)us-gaap_NetIncomeLoss $ 9,540us-gaap_NetIncomeLoss $ 6,431us-gaap_NetIncomeLoss $ (2,086)us-gaap_NetIncomeLoss $ 4,009us-gaap_NetIncomeLoss $ (13,727)us-gaap_NetIncomeLoss $ 7,732us-gaap_NetIncomeLoss $ (3,647)us-gaap_NetIncomeLoss $ (81,824)us-gaap_NetIncomeLoss $ (5,633)us-gaap_NetIncomeLoss $ 12,645us-gaap_NetIncomeLoss
Other comprehensive (loss) income:                      
Foreign currency translation adjustment                 (4,364)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (2,108)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 2,353us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Adjustment to retirement benefit liability, net of tax                 (24)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 53rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1 (79)rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax1
Adjustment to post-retirement healthcare benefit liability, net of tax                 (1,435)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 45us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (499)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Unrealized loss on cash flow hedges, net of tax                 (143)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Other comprehensive (loss) income                 (5,966)us-gaap_OtherComprehensiveIncomeLossNetOfTax (2,010)us-gaap_OtherComprehensiveIncomeLossNetOfTax 1,775us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive (loss) income                 $ (87,790)us-gaap_ComprehensiveIncomeNetOfTax $ (7,643)us-gaap_ComprehensiveIncomeNetOfTax $ 14,420us-gaap_ComprehensiveIncomeNetOfTax