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Equity Awards - Restricted Shares Narrative (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted shares issued related to director fee deferrals | 2,759 us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued |  |
Restricted Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 241,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Unrecognized unvested restricted shares-based compensation expense | 11,400,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense | 2 years 2 months |  |
Restricted shares-based compensation expense | 2,500,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | 32,949 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Plan 1 [Member] | Service-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 174,874 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan1Member |  |
Award requisite service period | 3 years |  |
Plan 2 [Member] | Service-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 35,813 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan2Member |  |
Award requisite service period |  | 1 year |
Cash value of incentive plan | 80.00%trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardCashValueOfIncentivePlan / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan2Member |  |
Restriced shares value of incentive plan | 20.00%trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedSharesValueOfIncentivePlan / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan2Member |  |
Plan 4 [Member] | Service-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 1,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan4Member |  |
Award requisite service period | 1 year |  |
Plan 5 [Member] | Service-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award requisite service period | 1 year |  |
Plan 5 [Member] | Service-based restriced shares [Member] | Non-employee independent director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 26,704 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan5Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Minimum [Member] | Plan 2 [Member] | Service-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
ICP, Threshold target for granting stock awards | 20,000 trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveCompensationPlanThresholdTargetAwardForGrantingStockAward / us-gaap_AwardTypeAxis = trs_ServiceBasedRestricedSharesMember / us-gaap_PlanNameAxis = trs_Plan2Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
3 year EPS CAGR metric [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award percentage earned based on metric over the performance period |  |  | 75.00%trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPercentageEarnedBasedOnMetricOverPerformancePeriod / us-gaap_AwardTypeAxis = trs_PerformanceBasedRestricedSharesMember / trs_MetricTypeAxis = trs_A3YearEpsCagrMetricMember / us-gaap_PlanNameAxis = trs_Plan3Member
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained |  |  | 70.25%trs_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPercentageAttained / us-gaap_AwardTypeAxis = trs_PerformanceBasedRestricedSharesMember / trs_MetricTypeAxis = trs_A3YearEpsCagrMetricMember / us-gaap_PlanNameAxis = trs_Plan3Member
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | 28,205 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = trs_PerformanceBasedRestricedSharesMember / trs_MetricTypeAxis = trs_A3YearEpsCagrMetricMember / us-gaap_PlanNameAxis = trs_Plan3Member |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained + References No definition available. + Details
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- Definition Award percentage earned based on metric over the performance period. + References No definition available. + Details
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- Definition Percentage of the value of the incentive plan in earned cash. + References No definition available. + Details
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- Definition Incentive Compensation Plan, Threshold Target Award for Granting Stock Award. + References No definition available. + Details
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- Definition Percentage of the value of the incentive plan in restriced shares. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Number of shares issued pursuant to the terms of a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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