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Long-term Debt - Receivables Facility (Details) (Receivables Facility [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 17, 2012
Debt Instrument [Line Items] |  |  |
Secured debt, Maximum Borrowing Capacity | $ 105.0 |  | $ 90.0
Debt cost, 3-month LIBOR plus | 1.20% | 1.50% |
Debt Instrument, Unused Borrowing Capacity, Fee percentage | 0.40% | 0.45% |
Receivables facility debt outstanding | 18.0 | 0 |
Receivables facility debt available but not utilized | 51.9 | 57.6 |
Receivables tacililty, debt aggregate costs | $ 1.3 | $ 1.6 |
Average liquidation period, Receivables pool | 1 year 7 months |  |
Average discount rate, Receivables facility | 1.80% |  |
Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt cost, 3-month LIBOR plus | 1.20% |  | 1.50%
Debt Instrument, Unused Borrowing Capacity, Fee percentage |  |  | 0.45%
Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt cost, 3-month LIBOR plus | 1.35% |  | 1.75%
Debt Instrument, Unused Borrowing Capacity, Fee percentage | 0.40% |  |

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- Definition The average discount rate utilized to calculate the present value of the receivables sold under the facility debt arrangement. + References No definition available. + Details
Name: | trs_AverageDiscountRateReceivablesFacility
Namespace Prefix: | trs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Average liquidation period of the receivables in the receivables pool. + References No definition available. + Details
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Data Type: | us-types:durationStringItemType
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- Definition Debt Instrument, Unused Borrowing Capacity, Fee percentage + References No definition available. + Details
Name: | trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage
Namespace Prefix: | trs_
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References No definition available. + Details
Name: | trs_ReceivablesFacililtyDebtAggregateCosts
Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maximum borrowing capacity under the receivables facility debt arrangement. + References No definition available. + Details
Name: | trs_SecuredDebtMaximumBorrowingCapacity
Namespace Prefix: | trs_
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Balance Type: | credit
Period Type: | instant

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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