Estimated Time until Primary Insurance is Exhausted

No definition available.

Name:	trs_EstimatedTimeUntilPrimaryInsuranceIsExhausted
Namespace Prefix:	trs_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

- Definition

Loss Contingency, Number of Plantiffs Specifying Damages Sought

+ References

No definition available.

+ Details

Name:	trs_LossContingencyNumberOfPlantiffsSpecifyingDamagesSought
Namespace Prefix:	trs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of Settlement and Defense Costs Covered by Insurance

+ References

No definition available.

+ Details

Name:	trs_PercentageOfSettlementAndDefenseCostsCoveredByInsurance
Namespace Prefix:	trs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Commitments and Contingencies - Asbestos Narrative (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	261 Months Ended
	Sep. 30, 2012 claimants	Dec. 31, 2011 claimants	Sep. 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	1,119		1,119
Number of pending claims	7,972
Number of pending claims seeking specific amounts of damages	76		76