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Equity Awards - Equity Awards Narrative (Details)
Dec. 31, 2014
number
Mar. 31, 2014
number
Director Retainer [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Approved for Issuance 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= trs_DirectorRetainerMember		  
Plan 3 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of performance metrics in restricted shares award type plan 2trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceMetricsInRestrictedSharesAwardTypePlan
/ us-gaap_PlanNameAxis
= trs_Plan3Member		 2trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceMetricsInRestrictedSharesAwardTypePlan
/ us-gaap_PlanNameAxis
= trs_Plan3Member
2011 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fungible Ratio 1.75trs_FungibleRatio
/ us-gaap_PlanNameAxis
= trs_A2011PlanMember		  
Shares Approved for Issuance 2,850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= trs_A2011PlanMember		  
2006 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fungible Ratio 2trs_FungibleRatio
/ us-gaap_PlanNameAxis
= trs_A2006PlanMember		  
Shares Approved for Issuance 2,435,877us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= trs_A2006PlanMember		  
2002 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fungible Ratio 1trs_FungibleRatio
/ us-gaap_PlanNameAxis
= trs_A2002PlanMember		  
Shares Approved for Issuance 1,786,123us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= trs_A2002PlanMember		  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fungible Ratio 1trs_FungibleRatio
/ us-gaap_StatementClassOfStockAxis
= us-gaap_EmployeeStockOptionMember