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Leases Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Leases [Abstract] |  |  |
Operating Leases, Future Minimum Payments Due, For Discontinued Operations Annually | $ 2.4 |  |
Operating Leases, Rent Expense, Net | $ 17.4 | $ 17.2 | $ 16.8

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- Definition Operating Leases, Future Minimum Payments Due, For Discontinued Operations Annually + References No definition available. + Details
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Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration