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Commitments and Contingencies - Asbestos Damages Sought (Details) (Asbestos [Member], USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Compensatory and Punitive Damages [Member] | Range 1 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | $ 0
Compensatory and Punitive Damages [Member] | Range 1 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 5.0
Compensatory and Punitive Damages [Member] | Range 2 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 5.0
Compensatory and Punitive Damages [Member] | Range 2 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 10.0
Compensatory and Punitive Damages [Member] | Range 3 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 10.0
Compensatory Only Damages [Member] | Range 1 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 0
Compensatory Only Damages [Member] | Range 1 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 0.6
Compensatory Only Damages [Member] | Range 2 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 0.6
Compensatory Only Damages [Member] | Range 2 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 5.0
Compensatory Only Damages [Member] | Range 3 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 5.0
Punitive Only Damages [Member] | Range 1 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 0
Punitive Only Damages [Member] | Range 1 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 2.5
Punitive Only Damages [Member] | Range 2 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 2.5
Punitive Only Damages [Member] | Range 2 [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | 5.0
Punitive Only Damages [Member] | Range 3 [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Specified amount of damages sought | $ 5.0
Pending Litigation [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 104
Pending Litigation [Member] | Compensatory and Punitive Damages [Member] | Range 1 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 76
Pending Litigation [Member] | Compensatory and Punitive Damages [Member] | Range 2 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 15
Pending Litigation [Member] | Compensatory and Punitive Damages [Member] | Range 3 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 13
Pending Litigation [Member] | Compensatory Only Damages [Member] | Range 1 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 28
Pending Litigation [Member] | Compensatory Only Damages [Member] | Range 2 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 56
Pending Litigation [Member] | Compensatory Only Damages [Member] | Range 3 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 20
Pending Litigation [Member] | Punitive Only Damages [Member] | Range 1 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 95
Pending Litigation [Member] | Punitive Only Damages [Member] | Range 2 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 8
Pending Litigation [Member] | Punitive Only Damages [Member] | Range 3 [Member] |
Loss Contingencies [Line Items] |
Number of pending claims seeking specific amounts of damages | 1

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- Definition Loss Contingency, Number of Plaintiffs Specifying Damages Sought + References No definition available. + Details
Name: | trs_LossContingencyNumberofPlaintiffsSpecifyingDamagesSought
Namespace Prefix: | trs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration