Debt Instrument, Principal Payment on maturity date.

No definition available.

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Balance Type:	debit
Period Type:	duration

- Definition

Incremental debt commitments capacity.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The fair value of long-term debt presented as a % of par value.

+ References

No definition available.

+ Details

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- Definition

Requirements prepayments under term loan A facility

+ References

No definition available.

+ Details

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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

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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Period Type:	duration

- 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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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ 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)

-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

-Article 5

+ Details

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Balance Type:	debit
Period Type:	duration

- 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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Balance Type:	credit
Period Type:	instant

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Net amount of long-term deferred finance costs capitalized at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),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 19, 22

-Article 5

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

The cash outflow for loan and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Balance Type:
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- Details

Name:	trs_PrincipalPaymentScheduleAxis=trs_PrincipalpaymentMarch2017throughDecember2018Member
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Period Type:

- Details

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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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- Details

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Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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Long-term Debt - U.S. Bank Debt (Details) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended
Long-term Debt - U.S. Bank Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
term loan A facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 450,000,000	$ 450,000,000			$ 450,000,000
Requirements prepayments under term loan A facility		0
Term Loan Facility, Principal Payment on Maturity Date	333,800,000
Incremental senior secured term loan A borrowing [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	275,000,000	275,000,000			275,000,000
Interest rate, LIBOR plus		1.825%
Payments of Debt Extinguishment and Issuance Costs		3,800,000
Deferred Finance Costs, Noncurrent, Net	400,000	400,000			400,000
Debt Issuance Cost		3,400,000
Revolving credit and term loan facilities [Member]
Debt Instrument [Line Items]
Incremental debt commitments capacity	300,000,000	300,000,000			300,000,000
Payments of Debt Extinguishment and Issuance Costs			3,600,000	6,400,000
Deferred Finance Costs, Noncurrent, Net			3,100,000	4,500,000
Debt Issuance Cost			500,000	1,900,000
Write off of Deferred Debt Issuance Cost			1,900,000	1,100,000
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Interest rate, LIBOR plus		1.50%
U.S. bank debt and receivables facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	192,000,000	192,000,000	360,300,000		192,000,000
Incremental senior secured term loan A borrowing [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	275,000,000	275,000,000			275,000,000
Debt Instrument, Maturity Date	Oct. 16, 2018
Receivables Facility [Member]
Debt Instrument [Line Items]
Interest rate, LIBOR plus					1.00%
Debt Instrument, Maturity Date		Oct. 16, 2018	Oct. 12, 2017
Debt Instrument, Unused Borrowing Capacity, Amount	1,600,000	1,600,000	20,200,000		1,600,000
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	175,000,000	175,000,000			175,000,000
Debt Instrument, Maturity Date	Oct. 16, 2018
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	75,000,000	75,000,000			75,000,000
Interest rate, LIBOR plus		1.50%
Line of Credit Facility, Maximum Borrowing Capacity	575,000,000	575,000,000			575,000,000
Debt Instrument, Maturity Date	Oct. 16, 2018
Revolving Credit Facility, Amount Outstanding	118,100,000	118,100,000	71,100,000		118,100,000
Revolving Credit Facility, Remaining Borrowing Capacity	435,000,000	435,000,000	479,800,000		435,000,000
Letters of credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000	75,000,000			75,000,000
Letters of Credit Outstanding, Amount	21,900,000	21,900,000	24,100,000		21,900,000
Principal payment, March 2014 through December 2016 [Member] \| term loan A facility [Member]
Debt Instrument [Line Items]
Term Loan Facility, Quarterly Principal Payments	5,800,000
Principal payment, March 2017 through December 2018 [Member] \| term loan A facility [Member]
Debt Instrument [Line Items]
Term Loan Facility, Quarterly Principal Payments	$ 8,700,000
Fair Value, Inputs, Level 2 [Member] \| term loan A facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value, % of par value	99.50%	99.50%	99.90%		99.50%