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Subsequent Event Purchase of Rapak (Details) - Rapak [Member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2019 | Apr. 17, 2020
Subsequent Event [Line Items] |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period | $ 30.0 |
Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Purchase price based on definitive sales agreement |  | $ 11.4

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- Definition Purchase price based on definitive sales agreement + References No definition available. + Details
Name: | trs_Purchasepricebasedondefinitivesalesagreement
Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=trs_RapakMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |