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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | $ 41,580 | $ 41,580
Accumulated amortization of intangible assets | (17,633) | (14,976)
Amortized intangible assets, Net | 23,947 | 26,604
Railcar Leases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 3,249 | 3,249
Accumulated amortization of intangible assets | (3,249) | (3,249)
Amortized intangible assets, Net | 0 | 0
Trade names and trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 6,267 | 6,267
Accumulated amortization of intangible assets | (5,037) | (4,951)
Amortized intangible assets, Net | 1,230 | 1,316
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 32,064 | 32,064
Accumulated amortization of intangible assets | (9,347) | (6,776)
Amortized intangible assets, Net | $ 22,717 | $ 25,288

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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