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Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis and Non-Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 4,214 | $ 7,993
Restricted certificates of deposit |  | 182
Warrant liability | 31,699 | 12,730
Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale |  | 10,383
Right of use asset |  | 28,960
Property, plant and equipment, net |  | 11,515
Railcars available for lease, net |  | 13,175
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 4,214 | 7,993
Restricted certificates of deposit |  | 182
Warrant liability | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale |  | 0
Right of use asset |  | 0
Property, plant and equipment, net |  | 0
Railcars available for lease, net |  | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Restricted certificates of deposit |  | 0
Warrant liability | 31,699 | 12,730
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale |  | 0
Right of use asset |  | 0
Property, plant and equipment, net |  | 0
Railcars available for lease, net |  | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Restricted certificates of deposit |  | 0
Warrant liability | $ 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale |  | 10,383
Right of use asset |  | 28,960
Property, plant and equipment, net |  | 11,515
Railcars available for lease, net |  | $ 13,175

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- Definition Railcars Availble For Lease, Fair Value + References No definition available. + Details
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Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the fair value of restricted certificates of deposit held. These certificates of deposit are not cash equivalents as original maturities are in excess of 90 days. + References No definition available. + Details
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Namespace Prefix: | rail_
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- Definition Right Of Use Assets, Fair Value Disclosure + References No definition available. + Details
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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- 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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- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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Balance Type: | credit
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