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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 24,491us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 31,123us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net	70,734us-gaap_AccountsReceivableNetCurrent	59,374us-gaap_AccountsReceivableNetCurrent
Inventories, net:
Raw materials and in-process	16,217us-gaap_InventoryRawMaterialsAndSupplies	26,877us-gaap_InventoryRawMaterialsAndSupplies
Finished parts	42,414grc_InventoryFinishedParts	46,491grc_InventoryFinishedParts
Finished products	36,129us-gaap_InventoryFinishedGoods	16,578us-gaap_InventoryFinishedGoods
	94,760us-gaap_InventoryNet	89,946us-gaap_InventoryNet
Deferred income taxes	4,694us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	3,803us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid and other	6,030us-gaap_PrepaidExpenseAndOtherAssetsCurrent	5,043us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets	200,709us-gaap_AssetsCurrent	189,289us-gaap_AssetsCurrent
Property, plant, and equipment
Land	3,562us-gaap_Land	3,048us-gaap_Land
Buildings	100,943us-gaap_BuildingsAndImprovementsGross	96,775us-gaap_BuildingsAndImprovementsGross
Machinery and equipment	162,155us-gaap_MachineryAndEquipmentGross	153,935us-gaap_MachineryAndEquipmentGross
	266,660us-gaap_PropertyPlantAndEquipmentGross	253,758us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	132,696us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	122,569us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment - net	133,964us-gaap_PropertyPlantAndEquipmentNet	131,189us-gaap_PropertyPlantAndEquipmentNet
Deferred income taxes and other	6,313us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent	3,657us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent
Goodwill and other intangible assets - net	39,918us-gaap_IntangibleAssetsNetIncludingGoodwill	31,503us-gaap_IntangibleAssetsNetIncludingGoodwill
	380,904us-gaap_Assets	355,638us-gaap_Assets
Current Liabilities:
Accounts payable	17,908us-gaap_AccountsPayableCurrent	17,882us-gaap_AccountsPayableCurrent
Short-term debt	12,000us-gaap_DebtCurrent	9,000us-gaap_DebtCurrent
Payroll and employee related liabilities	11,355us-gaap_EmployeeRelatedLiabilitiesCurrent	11,020us-gaap_EmployeeRelatedLiabilitiesCurrent
Commissions payable	9,448us-gaap_AccruedSalesCommissionCurrent	6,081us-gaap_AccruedSalesCommissionCurrent
Deferred revenue	4,166us-gaap_DeferredRevenueCurrent	7,190us-gaap_DeferredRevenueCurrent
Accrued expenses	9,469us-gaap_AccruedLiabilitiesCurrent	9,587us-gaap_AccruedLiabilitiesCurrent
Total current liabilities	64,346us-gaap_LiabilitiesCurrent	60,760us-gaap_LiabilitiesCurrent
Pension benefits	4,496us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Postretirement benefits	21,297us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	18,393us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Deferred and other income taxes	8,798us-gaap_DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent	12,345us-gaap_DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent
Total liabilities	98,937us-gaap_Liabilities	91,498us-gaap_Liabilities
Common Shares, without par value:
Authorized - 35,000,000 shares;	5,133us-gaap_CommonStockValue	5,131us-gaap_CommonStockValue
Additional paid-in capital	3,059us-gaap_AdditionalPaidInCapital	2,822us-gaap_AdditionalPaidInCapital
Retained earnings	291,101us-gaap_RetainedEarningsAccumulatedDeficit	264,648us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss	(17,326)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(8,461)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total equity	281,967us-gaap_StockholdersEquity	264,140us-gaap_StockholdersEquity
	$ 380,904us-gaap_LiabilitiesAndStockholdersEquity	$ 355,638us-gaap_LiabilitiesAndStockholdersEquity

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