Capital lease obligation, gross of issuance costs

No definition available.

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- Definition

Debt Instrument, Number of Classes

+ References

No definition available.

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- Definition

Letters Of Credit Outstanding, Expiring In Next Fiscal Year

+ References

No definition available.

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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Remaining Borrowing Capacity Exclusive of Current Restrictions

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- 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 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

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

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(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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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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

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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

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Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, 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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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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Balance Type:	na
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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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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 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: 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=64930785&loc=d3e28551-108399

+ 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

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ 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:	num:percentItemType
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
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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 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 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

Reference 3: 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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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

+ 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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Balance Type:	credit
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- Definition

Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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Name:	dei_LegalEntityAxis=trn_TrinityRailLeasingFiveMember
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Name:	dei_LegalEntityAxis=trn_TRIPMasterFundingMember
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Debt (Details Textual)	12 Months Ended
Debt (Details Textual)	Dec. 31, 2016 USD ($) day class $ / shares	Dec. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	May 31, 2014 USD ($) class	Aug. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jul. 31, 2011 USD ($)	Oct. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Nov. 30, 2009 USD ($)	May 31, 2006 USD ($)
Debt Instrument [Line Items]
Non-recourse debt	$ 2,206,000,000	$ 2,358,700,000
Wholly-owned subsidiaries
Debt Instrument [Line Items]
Non-recourse debt	$ 840,000,000	928,700,000
Secured debt \| TRL V \| 2006 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance											$ 355,000,000
Fixed interest rate	5.90%
Non-recourse debt	$ 194,200,000
Secured debt \| TRL VII \| 2009 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance										$ 238,300,000
Fixed interest rate	6.66%
Non-recourse debt	$ 172,500,000
Secured debt \| TRL 2010 \| 2010 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance								$ 369,200,000
Fixed interest rate	5.19%
Non-recourse debt	$ 280,600,000
Secured debt \| TRIP Holdings \| TRIP Holdings Senior Secured Notes
Debt Instrument [Line Items]
Principal amount upon issuance							$ 175,000,000.0
Secured debt \| TRIP Master Funding \| TRIP Master Funding secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance							$ 857,000,000.0
Number of classes of debt \| class	3
Secured debt \| TRIP Master Funding \| TRIP Master Funding Secured Railcar Equipment, Class A-1a notes
Debt Instrument [Line Items]
Fixed interest rate	4.37%
Non-recourse debt	$ 88,100,000
Secured debt \| TRIP Master Funding \| TRIP Master Funding Secured Railcar Equipment, Class A-1b notes
Debt Instrument [Line Items]
Non-recourse debt	$ 49,800,000
Secured debt \| TRIP Master Funding \| TRIP Master Funding Secured Railcar Equipment, Class A-1b notes \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Secured debt \| TRIP Master Funding \| Trip Master Funding Secured Railcar Equipment, Class A-2 notes
Debt Instrument [Line Items]
Fixed interest rate	6.02%
Non-recourse debt	$ 509,600,000
Secured debt \| TRIP Master Funding \| TRIP Master Funding, Series 2014-1 Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Principal amount upon issuance				$ 335,700,000
Number of classes of debt \| class				2
Secured debt \| TRIP Master Funding \| TRIP Master Funding, Series 2014-1 Secured Railcar Equipment Notes, Class A-1
Debt Instrument [Line Items]
Fixed interest rate	2.86%
Secured debt \| TRIP Master Funding \| TRIP Master Funding Series, 2014-1 Secured Railcar Equipment Notes, Class A-2
Debt Instrument [Line Items]
Fixed interest rate	4.09%
Secured debt \| TRL 2012 \| 2012 Class A-1 Notes
Debt Instrument [Line Items]
Principal amount upon issuance						$ 145,400,000
Fixed interest rate	2.27%
Non-recourse debt	$ 79,200,000
Secured debt \| TRL 2012 \| 2012 Class A-2 Notes
Debt Instrument [Line Items]
Principal amount upon issuance						$ 188,400,000
Fixed interest rate	3.53%
Non-recourse debt	$ 188,400,000
Secured debt \| TRL 2012 \| Series 2013-1 Secured Railcar Equipment Notes
Debt Instrument [Line Items]
Principal amount upon issuance					$ 183,400,000
Fixed interest rate	3.90%
Non-recourse debt	$ 157,900,000
Corporate \| Convertible subordinated notes \| 3-7/8% convertible subordinated notes due 2036
Debt Instrument [Line Items]
Percentage of principal amount used in cash redemption value computation	100.00%
Debt instrument, convertible, if-converted value in excess of principal	$ 92,500,000	92,500,000
Effective annual interest rate	8.42%
Convertible debt, threshold percentage of stock price trigger	130.00%
Convertible debt, threshold trading days \| day	20
Convertible debt, threshold consecutive trading days	30 days
Convertible debt, conversion price (in dollars per share) \| $ / shares	$ 24.57
Fixed interest rate	3.875%
Corporate \| Senior notes \| 4.55% Senior Notes due October 2024
Debt Instrument [Line Items]
Principal amount upon issuance			$ 400,000,000
Fixed interest rate			4.55%
Railcar Leasing and Management Services Group
Debt Instrument [Line Items]
Non-recourse debt	$ 2,206,000,000	2,358,700,000
Railcar Leasing and Management Services Group \| Wholly-owned subsidiaries
Debt Instrument [Line Items]
Non-recourse debt	840,000,000	928,700,000
Railcar Leasing and Management Services Group \| Secured debt \| TRIP Master Funding \| TRIP Master Funding, Series 2014-1 Secured Railcar Equipment Notes, Class A-1
Debt Instrument [Line Items]
Non-recourse debt	87,300,000
Railcar Leasing and Management Services Group \| Secured debt \| TRIP Master Funding \| TRIP Master Funding Series, 2014-1 Secured Railcar Equipment Notes, Class A-2
Debt Instrument [Line Items]
Non-recourse debt	220,700,000
Railcar Leasing and Management Services Group \| Capital lease obligations
Debt Instrument [Line Items]
Capital lease obligations	32,000,000	$ 35,700,000							$ 56,600,000
Capital lease obligation, gross of issuance costs	32,100,000
Revolving credit facility \| Corporate \| Line of credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	600,000,000
Credit facility, remaining borrowing capacity	507,700,000
Credit facility, amount outstanding exclusive of letters of credit	0
Revolving credit facility \| Railcar Leasing and Management Services Group \| Line of credit \| TILC \| TILC warehouse facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 1,000,000,000.0
Effective annual interest rate	2.64%
Long-term line of credit	$ 204,100,000
Revolving credit facility \| Railcar Leasing and Management Services Group \| Line of credit \| Wholly-owned subsidiaries \| TILC warehouse facility
Debt Instrument [Line Items]
Credit facility, remaining borrowing capacity, exclusive of current restrictions	795,900,000
Letter of credit \| Corporate \| Line of credit
Debt Instrument [Line Items]
Letters of credit outstanding	92,300,000
Letters of credit, outstanding, expiring In next 12 months	$ 92,200,000