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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 41,580 $ 41,580
Accumulated amortization of intangible assets (14,976) (11,668)
Amortized intangible assets, Net 26,604 29,912
Railcar Leases    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 3,249 3,249
Accumulated amortization of intangible assets (3,249) (2,599)
Amortized intangible assets, Net 0 650
Trade names and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 6,267 6,267
Accumulated amortization of intangible assets (4,951) (4,864)
Amortized intangible assets, Net 1,316 1,403
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 32,064 32,064
Accumulated amortization of intangible assets (6,776) (4,205)
Amortized intangible assets, Net $ 25,288 $ 27,859