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Property and Equipment, Net - Depreciation Expense Table (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Depreciation Expense [Line Items] |  |
Depreciation expense | $ 7,620 us-gaap_Depreciation | $ 8,030 us-gaap_Depreciation
Continuing Operations [Member] |  |
Depreciation Expense [Line Items] |  |
Depreciation expense | 7,620 us-gaap_Depreciation / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 8,020 us-gaap_Depreciation / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Cost of Sales [Member] | Continuing Operations [Member] |  |
Depreciation Expense [Line Items] |  |
Depreciation expense | 6,510 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 6,740 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Selling, General and Administrative Expenses [Member] | Continuing Operations [Member] |  |
Depreciation Expense [Line Items] |  |
Depreciation expense | $ 1,110 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | $ 1,280 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember

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Namespace Prefix: | trs_
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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