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Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) (Fair Value, Inputs, Level 2 [Member]) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Senior Secured Term Loan A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Fair Value, % of par value | 99.30% |
Senior Secured Term Loan B [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Fair Value, % of par value | 99.90% | 99.00%
Senior secured notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Fair Value, % of par value |  | 108.50%

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- Definition The fair value of long-term debt presented as a % of par value. + References No definition available. + Details
Name: | trs_LongTermDebtFairValueOfParValue
Namespace Prefix: | trs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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