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Commitments and Contingencies - Asbestos Claimant and Settlement (Details) (Asbestos [Member], USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 claimants | Dec. 31, 2014 claimants
Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Number of pending claims at the beginning of period | 7,992 trs_NumberOfPendingClaimsAtBeginningOfPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 7,975 trs_NumberOfPendingClaimsAtBeginningOfPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Loss Contingency, New Claims Filed, Number | 83 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 210 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Number of pending claims dismissed during period | 338 trs_LossContingencyClaimsDismissedDuringPeriodNumberOfPlaintiffs / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 155 trs_LossContingencyClaimsDismissedDuringPeriodNumberOfPlaintiffs / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Number of pending claims settled during period | 4 trs_LossContingencyClaimsSettledDuringPeriodNumberOfPlaintiffs / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 38 trs_LossContingencyClaimsSettledDuringPeriodNumberOfPlaintiffs / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Average settlement amount per claim during period | $ 6,875 trs_LossContingencySettlementAgreementAverageConsideration / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | $ 18,734 trs_LossContingencySettlementAgreementAverageConsideration / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Total defense costs during period | $ 718,800 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | $ 2,800,000 us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember

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- Definition Number of Plaintiffs who had their claims dismissed during the period. + References No definition available. + Details
Name: | trs_LossContingencyClaimsDismissedDuringPeriodNumberOfPlaintiffs
Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Plaintiffs who had their claims settled during the period. + References No definition available. + Details
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Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Average amount of consideration the entity has agreed to pay to settle a legal matter for claims settled during the period. + References No definition available. + Details
Name: | trs_LossContingencySettlementAgreementAverageConsideration
Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of pending claims at the beginning of period + References No definition available. + Details
Name: | trs_NumberOfPendingClaimsAtBeginningOfPeriod
Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration