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Commitments and Contingencies - Asbestos Narrative (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended | 258 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 claimants | Dec. 31, 2011 claimants | Jun. 30, 2012
Minimum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated time until primary insurance is exhausted | 1 year |  | 1 year
Maximum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated time until primary insurance is exhausted | 2 years |  | 2 years
Asbestos [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of pending claims | 8,048 | 8,200 |
Total settlement costs |  |  | $ 6.3
Percentage of settlement and defense costs covered by insurance |  |  | 40.00%
Asbestos [Member] | Pending Litigation [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of pending cases | 1,089 |  | 1,089
Number of pending claims | 7,911 |  |
Number of pending claims seeking specific amounts of damages | 77 |  | 77

X
- Definition Estimated Time until Primary Insurance is Exhausted + References No definition available. + Details
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- 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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X
- Definition Percentage of Settlement and Defense Costs Covered by Insurance + References No definition available. + Details
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Namespace Prefix: | trs_
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Balance Type: | na
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- 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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Data Type: | xbrli:monetaryItemType
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X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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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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Period Type: | instant