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Summary of Significant Accounting Policies - Goodwill and Indefinite-Lived Intangibles (Details) | 12 Months Ended
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Dec. 31, 2012 number
Annual Goodwill Impairment Assessment [Abstract] |
Number of reporting units | 11
Number of Reportable Segments | 6
Number of reporting units that have goodwill | 6

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- Details
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Period Type: | duration

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- Definition Number of reporting units for purposes of the annual goodwill impairment assessment + References No definition available. + Details
Name: | trs_NumberOfReportingUnits
Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Number of reporting units that have goodwill + References No definition available. + Details
Name: | trs_NumberOfReportingUnitsThatHaveGoodwill
Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
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Period Type: | duration