Capital lease obligation, gross of issuance costs

No definition available.

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

- Definition

Debt Instrument, Number of Classes

+ References

No definition available.

+ Details

Name:	trn_DebtInstrumentNumberofClasses
Namespace Prefix:	trn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Letters Of Credit Outstanding, Expiring In Next Fiscal Year

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

Name:	trn_LineofCreditFacilityRemainingBorrowingCapacityExclusiveofCurrentRestrictions
Namespace Prefix:	trn_
Data Type:	xbrli:monetaryItemType
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=84164817&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

+ Details

Name:	us-gaap_CapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
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

Name:	us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

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

- 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

Name:	us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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 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

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
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

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

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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=75038535&loc=d3e64711-112823

+ Details

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

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
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 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

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
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

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
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

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

- 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

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

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_A378ConvertibleSubordinatedNotesDue2036Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_A4.55SeniorNotesDueOctober2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=trn_RailcarLeasingAndManagementServicesGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=trn_PromissoryNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_A2017SecuredRailcarEquipmentNotesMemberDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TrinityRailLeasing2012Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_Series2012OneClassAOneSecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_Series2012OneClassATwoSecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_Series2013OneSecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TripMasterFundingSecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TRIPMasterFundingSeries20171SecuredRailcarEquipmentNotesDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TRIPMasterFundingSeries20171ClassA1SecuredRailcarEquipmentNoteDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TRIPMasterFundingSeries20171ClassA2SecuredRailcarEquipmentNoteDomainDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_PartiallyOwnedSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TRIPMasterFundingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TripMasterFundingSecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TripMasterFundingSecuredRailcarEquipmentClassOneNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TripMasterFundingSecuredRailcarEquipmentClassOneBNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TripMasterFundingSecuredRailcarEquipmentClassTwoNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TRIPMasterFundingSeries2014OneSecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TRIPMasterFundingSeries2014OneSecuredRailcarEquipmentNotesClassAOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TRIPMasterFundingSeries2014OneSecuredRailcarEquipmentNotesClassATwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TripHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TripHoldingsSeniorSecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_WhollyOwnedSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_TilcWarehouseFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TILCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TrinityRailLeasing2010Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_A2010SecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TrinityRailLeasingSevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_A2009SecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=trn_TrinityRailLeasingFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=trn_A2006SecuredRailcarEquipmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OwnershipAxis=trn_PartiallyOwnedSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Narrative	12 Months Ended
Debt - Narrative	Dec. 31, 2017 USD ($) class day $ / shares	Dec. 31, 2016 USD ($)	Aug. 15, 2017 USD ($)	May 15, 2017 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	$ 2,375,600,000	$ 2,206,000,000
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 \| day	30
Convertible debt, conversion price (in dollars per share) \| $ / shares	$ 24.27
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	$ 2,375,600,000	2,206,000,000
Railcar Leasing and Management Services Group \| Capital lease obligations
Debt Instrument [Line Items]
Capital lease obligations	28,300,000	32,000,000									$ 56,600,000
Capital lease obligation, gross of issuance costs	28,300,000
Railcar Leasing and Management Services Group \| 2017 Promissory notes \| 2017 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance				$ 302,400,000
Revolving credit facility \| Corporate \| Line of credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	600,000,000
Credit facility, remaining borrowing capacity	521,100,000
Credit facility, amount outstanding exclusive of letters of credit	0
Letter of credit \| Corporate \| Line of credit
Debt Instrument [Line Items]
Letters of credit outstanding	78,900,000
Letters of credit, outstanding, expiring In next 12 months	$ 78,600,000
TRL 2012 \| Secured debt \| 2012 Class A-1 Notes
Debt Instrument [Line Items]
Principal amount upon issuance								$ 145,400,000
Fixed interest rate	2.27%
Non-recourse debt	$ 65,800,000
TRL 2012 \| Secured debt \| 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
TRL 2012 \| Secured debt \| 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	$ 148,600,000
TRIP Master Funding secured railcar equipment notes \| Secured debt \| TRIP Master Funding Series 2017-1 Secured Railcar Equipment Notes [Domain]
Debt Instrument [Line Items]
Number of classes of debt	2
TRIP Master Funding secured railcar equipment notes \| Secured debt \| TRIP Master Funding Series 2017-1 Class A-1 Secured Railcar Equipment Note [Domain]
Debt Instrument [Line Items]
Fixed interest rate	2.71%
Non-recourse debt	$ 97,300,000
TRIP Master Funding secured railcar equipment notes \| Secured debt \| TRIP Master Funding Series 2017-1 Class A-2 Secured Railcar Equipment Note [Domain] [Domain]
Debt Instrument [Line Items]
Fixed interest rate	3.74%
Non-recourse debt	$ 134,900,000
Partially-owned subsidiaries
Debt Instrument [Line Items]
Non-recourse debt	1,350,800,000	1,366,000,000
Partially-owned subsidiaries \| Railcar Leasing and Management Services Group
Debt Instrument [Line Items]
Non-recourse debt	$ 1,350,800,000	1,366,000,000
Partially-owned subsidiaries \| Railcar Leasing and Management Services Group \| Secured debt \| TRIP Master Funding Series 2017-1 Secured Railcar Equipment Notes [Domain]
Debt Instrument [Line Items]
Principal amount upon issuance			$ 237,900,000
TRIP Master Funding \| Secured debt \| 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
TRIP Master Funding \| Secured debt \| TRIP Master Funding Secured Railcar Equipment, Class A-1a notes
Debt Instrument [Line Items]
Fixed interest rate	4.37%
TRIP Master Funding \| Secured debt \| TRIP Master Funding Secured Railcar Equipment, Class A-1b notes \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
TRIP Master Funding \| Secured debt \| 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
TRIP Master Funding \| Secured debt \| 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
TRIP Master Funding \| Secured debt \| TRIP Master Funding, Series 2014-1 Secured Railcar Equipment Notes, Class A-1
Debt Instrument [Line Items]
Fixed interest rate	2.86%
TRIP Master Funding \| Secured debt \| TRIP Master Funding Series, 2014-1 Secured Railcar Equipment Notes, Class A-2
Debt Instrument [Line Items]
Fixed interest rate	4.09%
TRIP Master Funding \| Railcar Leasing and Management Services Group \| Secured debt \| TRIP Master Funding Series, 2014-1 Secured Railcar Equipment Notes, Class A-2
Debt Instrument [Line Items]
Non-recourse debt	$ 220,700,000
TRIP Holdings \| Secured debt \| TRIP Holdings Senior Secured Notes
Debt Instrument [Line Items]
Principal amount upon issuance									$ 175,000,000.0
Wholly-owned subsidiaries
Debt Instrument [Line Items]
Non-recourse debt	1,024,800,000	840,000,000
Wholly-owned subsidiaries \| Railcar Leasing and Management Services Group
Debt Instrument [Line Items]
Non-recourse debt	1,024,800,000	$ 840,000,000
Wholly-owned subsidiaries \| Revolving credit facility \| Railcar Leasing and Management Services Group \| Line of credit \| TILC warehouse facility
Debt Instrument [Line Items]
Credit facility, remaining borrowing capacity, exclusive of current restrictions	849,300,000
TILC \| Revolving credit facility \| Railcar Leasing and Management Services Group \| Line of credit \| TILC warehouse facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 1,000,000,000.0
Effective annual interest rate	3.23%
Long-term line of credit	$ 150,700,000
TRL 2010 \| Secured debt \| 2010 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance										$ 369,200,000
Fixed interest rate	5.19%
Non-recourse debt	$ 266,900,000
TRL VII \| Secured debt \| 2009 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance												$ 238,300,000
Fixed interest rate	6.66%
Non-recourse debt	$ 166,200,000
TRL V \| Secured debt \| 2006 secured railcar equipment notes
Debt Instrument [Line Items]
Principal amount upon issuance													$ 355,000,000
Fixed interest rate	5.90%
Non-recourse debt	$ 158,500,000
Designated as hedging instrument \| 2017 Promissory note
Debt Instrument [Line Items]
2017 Promissory note interest rate	3.00%
Partially-owned subsidiaries \| Railcar Leasing and Management Services Group
Debt Instrument [Line Items]
Weighted average ownership interest	38.00%