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Commitments and Contingencies - Asbestos Narrative (Details) (USD $) In Millions, unless otherwise specified |  | 264 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Asbestos [Member] | Dec. 31, 2012 Asbestos [Member] Pending Litigation [Member] claimants cases
Loss Contingencies [Line Items] |  |  |  |
Number of pending cases |  |  |  | 1,023
Number of pending claims |  |  |  | 7,880
Number of pending claims seeking specific amounts of damages |  |  |  | 89
Total settlement costs |  |  | $ 6.3 |
Estimated time until primary insurance is exhausted | 1 year | 2 years |  |
Percentage of settlement and defense costs covered by insurance |  |  | 40.00% |

X
- Definition Estimated Time until Primary Insurance is Exhausted + References No definition available. + Details
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Balance Type: | na
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X
- Definition Loss Contingency, Number of Plantiffs Specifying Damages Sought + References No definition available. + Details
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Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
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- Definition Percentage of Settlement and Defense Costs Covered by Insurance + References No definition available. + Details
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Namespace Prefix: | trs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the expenses incurred by the entity which are directly related and attributable to receiving an award in settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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Data Type: | xbrli:stringItemType
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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