Convertible subordinated debt gross.

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

Date through which debt discount is being amortized

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Number of Classes

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Redemption, Number of Redemption Installments

+ References

No definition available.

+ Details

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Namespace Prefix:	trn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

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Balance Type:	na
Period Type:	duration

- Definition

Letter of credit expiring current year.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Amount Outstanding Exclusive of Letters of Credit

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Unused Portion of Maximum Borrowing Capacity

+ References

No definition available.

+ Details

Name:	trn_LineofCreditFacilityUnusedPortionofMaximumBorrowingCapacity
Namespace Prefix:	trn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of principal amount used in cash redemption value computation.

+ References

No definition available.

+ Details

Name:	trn_PercentageOfPrincipalAmountUsedInCashRedemptionValueComputation
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate increase on each of seventh and eighth anniversary dates of issuance.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Rate increase on each of tenth anniversary dates of issuance.

+ References

No definition available.

+ Details

Name:	trn_RateIncreaseOnEachOfTenthAnniversaryDatesOfIssuance
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Redemption value convertible subordinated debt noncurrent in cash.

+ References

No definition available.

+ Details

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

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Balance Type:	credit
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

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

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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

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-Topic 210

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-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

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Period Type:	instant

- 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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Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ 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

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- Definition

Description of debt redemption features under terms of the debt agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 2: 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 3: 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

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ 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:dateItemType
Balance Type:	na
Period Type:	duration

- 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

+ 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

+ Details

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

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

+ Details

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

- Details

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Period Type:

- Details

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Period Type:

- Details

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Debt (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2014	May 31, 2008	Dec. 31, 2013	Dec. 31, 2009	May 31, 2006	Nov. 30, 2009	Oct. 31, 2010	Jul. 31, 2011	Aug. 31, 2013
Debt (Textual) [Abstract]
Notes payable	$ 1,207.8us-gaap_NotesPayable		$ 1,314.7us-gaap_NotesPayable
Recourse \| Capital lease obligations
Debt (Textual) [Abstract]
Capital lease obligations				56.6
Non-recourse \| 2006 secured railcar equipment notes \| Trinity Rail Leasing V
Debt (Textual) [Abstract]
Maturity date	May 14, 2036
Face value of debt instrument					355.0
Interest rate on notes	5.90%
Notes payable	223.0
Non-recourse \| Promissory notes \| Trinity Rail Leasing VI
Debt (Textual) [Abstract]
Face value of debt instrument		572.2
Notes payable	363.9
Term of debt instrument		30 years
Rate at which LIBOR portion of debt is fixed due to issuance of interest rate swap	4.13%
Number of initial years of fixed interest rate due to swaps	7 years
Rate increase on each of seventh and eighth anniversary dates of issuance	0.50%
Rate increase on tenth anniversary date of issuance	2.00%
Non-recourse \| Promissory notes \| Trinity Rail Leasing VI \| Libor
Debt (Textual) [Abstract]
Percentage points added to base rate to compute interest rates on the credit facility	1.50%
Non-recourse \| 2009 secured railcar equipment notes \| Trinity Rail Leasing VII
Debt (Textual) [Abstract]
Maturity date	Nov. 16, 2039
Face value of debt instrument						238.3
Interest rate on notes	6.66%
Notes payable	188.8
Non-recourse \| 2010 secured railcar equipment notes \| Trinity Rail Leasing 2010
Debt (Textual) [Abstract]
Maturity date	Oct. 16, 2040
Face value of debt instrument							369.2
Interest rate on notes	5.19%
Notes payable	311.5
Non-recourse \| TRIP Holdings senior secured notes \| TRIP Holdings
Debt (Textual) [Abstract]
Face value of debt instrument								175.0
Non-recourse \| TRIP Master Funding secured railcar equipment notes \| TRIP Master Funding
Debt (Textual) [Abstract]
Face value of debt instrument								857.0
Maturity date	July 2041
Number of classes of notes	3
Non-recourse \| TRIP Master Funding Secured Railcar Equipment Class A-1a Notes \| TRIP Master Funding
Debt (Textual) [Abstract]
Interest rate on notes	4.37%
Notes payable	130.8
Non-recourse \| TRIP Master Funding Secured Railcar Equipment Class A-1b Notes \| TRIP Master Funding
Debt (Textual) [Abstract]
Notes payable	73.9
Non-recourse \| TRIP Master Funding Secured Railcar Equipment Class A-1b Notes \| TRIP Master Funding \| Libor
Debt (Textual) [Abstract]
Percentage points added to base rate to compute interest rates on the credit facility	2.50%
Non-recourse \| TRIP Master Funding Secured Railcar Equipment Class A-2 Notes \| TRIP Master Funding
Debt (Textual) [Abstract]
Interest rate on notes	6.02%
Notes payable	509.6
Non-recourse \| Series 2012-1 Class A-1 Secured Railcar Equipment Notes \| Trinity Rail Leasing 2012
Debt (Textual) [Abstract]
Maturity date	Jan. 15, 2043
Face value of debt instrument	145.4
Interest rate on notes	2.27%
Notes payable	111.5
Non-recourse \| Series 2012-1 Class A-2 Secured Railcar Equipment Notes \| Trinity Rail Leasing 2012
Debt (Textual) [Abstract]
Maturity date	Jan. 15, 2043
Face value of debt instrument	188.4
Interest rate on notes	3.53%
Notes payable	188.4
Non-recourse \| Series 2013-1 Secured Railcar Equipment Notes \| Trinity Rail Leasing 2012
Debt (Textual) [Abstract]
Maturity date	Jul. 15, 2043
Face value of debt instrument									183.4
Interest rate on notes	3.90%
Notes payable	172.3
Corporate \| Recourse \| Revolving credit facility
Debt (Textual) [Abstract]
Revolving credit facility	425.0
Maturity date of credit facility	Oct. 20, 2016
Used revolving credit facility for letters of credit	88.6
Availability of the revolving credit facility	336.4
Borrowing under revolving credit facility exclusive of letters of credit	0
Letter of credit expiring in current year	88.5
Corporate \| Recourse \| Revolving credit facility \| Carrying Value
Debt (Textual) [Abstract]
Revolving credit facility	0		0
Corporate \| Recourse \| Revolving credit facility \| Libor
Debt (Textual) [Abstract]
Percentage points added to base rate to compute interest rates on the credit facility	1.50%
Corporate \| Recourse \| Revolving credit facility \| Prime
Debt (Textual) [Abstract]
Percentage points added to base rate to compute interest rates on the credit facility	0.50%
Corporate \| Recourse \| Convertible subordinated notes
Debt (Textual) [Abstract]
Convertible Subordinated Notes face amount	450.0
Maturity date	Jun. 01, 2036
Redemption value Convertible Subordinated Notes if redeemed in cash	at 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest (including any contingent interest) up to, but excluding, the redemption date
Percentage of principal amount used in cash redemption value computation	100.00%
Capital in excess of par value related to the convertible subordinated notes' conversion options	92.5		92.8
Date through which debt discount is being amortized	Jun. 01, 2018
Effective annual interest rate yield based upon the estimated market interest rate	8.42%
Percentage of conversion price at which Convertible Subordinates Notes are convertible	130.00%
Conversion price of Convertible Subordinated Notes (in dollars per share)	$ 25.22
Interest rate on notes	3.875%
Corporate \| Recourse \| Convertible subordinated notes \| Carrying Value
Debt (Textual) [Abstract]
Convertible Subordinated Notes face amount	449.5		450.0
Corporate \| Recourse \| Senior notes
Debt (Textual) [Abstract]
Face value of debt instrument	400.0
Interest rate on notes	4.55%
Maturity date	October 2024
Railcar Leasing and Management Services Group \| Partially-owned subsidiaries
Debt (Textual) [Abstract]
Ownership percentage in partially-owned subsidiaries	39.00%
Railcar Leasing and Management Services Group \| Recourse \| Capital lease obligations
Debt (Textual) [Abstract]
Capital lease obligations				56.6
Railcar Leasing and Management Services Group \| Recourse \| Capital lease obligations \| Carrying Value
Debt (Textual) [Abstract]
Capital lease obligations	39.1		42.2
Railcar Leasing and Management Services Group \| Non-recourse \| Partially-owned subsidiaries \| Carrying Value
Debt (Textual) [Abstract]
Notes payable	1,515.9		1,256.1
Railcar Leasing and Management Services Group \| Non-recourse \| TILC warehouse facility \| TILC
Debt (Textual) [Abstract]
Revolving credit facility	475.0
Availability of the revolving credit facility	334.6
Effective annual interest rate yield based upon the estimated market interest rate	1.94%
Maturity date	June 2015
Revolving credit facility	120.6
Revolving credit facility, unused portion of maximum borrowing capacity	354.4
Number of installments payable for amounts outstanding at maturity, absent renewal	3
Railcar Leasing and Management Services Group \| Non-recourse \| TILC warehouse facility \| TILC \| First installment
Debt (Textual) [Abstract]
Installment payable date	December 2015
Railcar Leasing and Management Services Group \| Non-recourse \| TILC warehouse facility \| TILC \| Second Installment
Debt (Textual) [Abstract]
Installment payable date	June 2016
Railcar Leasing and Management Services Group \| Non-recourse \| TILC warehouse facility \| TILC \| Third installment
Debt (Textual) [Abstract]
Installment payable date	December 2016
Railcar Leasing and Management Services Group \| Non-recourse \| TRIP Master Funding secured railcar equipment notes \| Partially-owned subsidiaries \| Carrying Value
Debt (Textual) [Abstract]
Notes payable	1,043.7		756.8
Railcar Leasing and Management Services Group \| Non-recourse \| TRIP Master Funding Series 2014-1 Secured Railcar Equipment Notes \| TRIP Master Funding
Debt (Textual) [Abstract]
Face value of debt instrument	335.7
Maturity date	April 2044
Number of classes of notes	2
Railcar Leasing and Management Services Group \| Non-recourse \| TRIP Master Funding Series 2014-1 Secured Railcar Equipment Notes Class A-1 \| TRIP Master Funding
Debt (Textual) [Abstract]
Interest rate on notes	2.86%
Notes payable	108.7
Railcar Leasing and Management Services Group \| Non-recourse \| TRIP Master Funding Series 2014-1 Secured Railcar Equipment Notes Class A-2 \| TRIP Master Funding
Debt (Textual) [Abstract]
Interest rate on notes	4.09%
Notes payable	$ 220.7