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Goodwill and Other Intangible Assets - Goodwill Narrative (Details)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2014 Rate
Minimum [Member]
Goodwill [Line Items]
Estimated Fair Value Exceeding Carrying Value, Percentage	30.00%trs_EstimatedFairValueExceedingCarryingValuePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember
Energy Reporting Unit [Member]
Goodwill [Line Items]
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach		75.00%trs_FairValueInputsValuationMethodWeightingPercentageUsedIncomeBasedApproach / trs_ReportingunitAxis = trs_EnergyReportingUnitMember
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach		25.00%trs_FairValueInputsValuationMethodWeightingPercentageUsedMarketBasedApproach / trs_ReportingunitAxis = trs_EnergyReportingUnitMember
Fair Value Inputs, Discount Rate		13.00%us-gaap_FairValueInputsDiscountRate / trs_ReportingunitAxis = trs_EnergyReportingUnitMember
Fair Value Inputs, Long-term Revenue Growth Rate		3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate / trs_ReportingunitAxis = trs_EnergyReportingUnitMember
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		20.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / trs_ReportingunitAxis = trs_EnergyReportingUnitMember
Sensitivity Analysis, Fair Value, Goodwill, Impact of 1 Percent Change in Long Term Revenue Growth Rate		1.00%trs_SensitivityAnalysisFairValueGoodwillImpactof1PercentChangeinLongTermRevenueGrowthRate / trs_ReportingunitAxis = trs_EnergyReportingUnitMember
Sensitivity Analysis of Fair Value, Goodwill, Impact of 1 Percent Change in Discount Rate		1.00%trs_SensitivityAnalysisofFairValueGoodwillImpactof1PercentChangeinDiscountRate / trs_ReportingunitAxis = trs_EnergyReportingUnitMember

X

- Definition

Percentage by which estimated fair value exceeds carrying value.

+ References

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- Definition

Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach

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- Definition

Sensitivity Analysis of Fair Value, Goodwill, Impact of 1 Percent Change in Long Term Revenue Growth Rate

+ References

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

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