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Summary of Significant Accounting Policies - High Deductible Insurance (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Workers' Compensation [Member] |
Insurance coverage [Line Items] |
Maximum Retention | $ 0.8
Minimum [Member] | General Liability [Member] |
Insurance coverage [Line Items] |
Maximum Retention | 0.3
Maximum [Member] | General Liability [Member] |
Insurance coverage [Line Items] |
Maximum Retention | 1.5
Maximum [Member] | Group Medical Plan [Member] |
Insurance coverage [Line Items] |
Stop Loss Limit | $ 0.3

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- Definition Insurance coverage [Line Items] + References No definition available. + Details
Name: | trs_InsurancecoverageLineItems
Namespace Prefix: | trs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Self-insurance maximum retention per occurrence. + References No definition available. + Details
Name: | trs_MaximumRetention
Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Self-insurance stop loss limit per occurrence. + References No definition available. + Details
Name: | trs_StopLossLimit
Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | trs_InsuranceTypeAxis=trs_WorkersCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | trs_InsuranceTypeAxis=us-gaap_GeneralLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | trs_InsuranceTypeAxis=trs_GroupMedicalPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |