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Share-based Compensation Authorized Shares (Details)
In Thousands, unless otherwise specified
Dec. 31, 2014
Stock Options | 1995 Directors Stock Option Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 188us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cas_StockPlan1995DirectorsPlanMember
Stock Options | 2008 A. M. Castle & Co. Omnibus Incentive Plan (amended and restated as of April 25, 2013)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= cas_StockPlan2008IncentivePlanMember
Restricted Stock | 1996 Restricted Stock and Stock Option Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cas_StockPlan1996RestrictedStockPlanMember
Restricted Stock | 2000 Restricted Stock and Stock Option Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cas_StockPlan2000RestrictedStockPlanMember
Restricted Stock | 2004 Restricted Stock, Stock Option and Equity Compensation Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cas_StockPlan2004RestrictedStockPlanMember