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v2.4.1.9

Long-term Debt - Receivables Facility (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |
Secured debt, Maximum Borrowing Capacity | $ 105.0 trs_SecuredDebtMaximumBorrowingCapacity |  |
Receivables Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured Debt | 90.6 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 78.7 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
Debt Instrument, Basis Spread on Variable Rate | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 1.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
Receivables facility debt available but not utilized | 5.1 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 1.6 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
Receivables facililty, debt aggregate costs | $ 0.2 trs_ReceivablesFacililtyDebtAggregateCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  | $ 0.3 trs_ReceivablesFacililtyDebtAggregateCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
Debt Instrument, Maturity Date | Oct. 16, 2018 |  |
Debt Instrument, Unused Borrowing Capacity, Fee percentage | 0.35%trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 0.40%trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
Average liquidation period, Receivables pool | 1 month 21 days |  |
Average discount rate, Receivables facility | 1.80%trs_AverageDiscountRateReceivablesFacility / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |

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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, Receivables pool + References No definition available. + Details
Name: | trs_AverageliquidationperiodReceivablespool
Namespace Prefix: | trs_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt Instrument, Unused Borrowing Capacity, Fee percentage + References No definition available. + Details
Name: | trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage
Namespace Prefix: | trs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
Period Type: | duration

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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_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: 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 4: 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 + Details
Name: | us-gaap_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |