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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment shares	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) shares	Sep. 30, 2016 USD ($)
Disaggregation of Revenue [Line Items]
Reservation revenue recognized			$ 7,500,000
Rail car revenue recognized	$ 1,819,000		1,683,000
Revenue generated from transportation	11,893,000		6,604,000
Revenue recognized	$ 0
Accounts receivables due period	30 days
Accounts receivables, allowance for doubtful accounts	$ 0	$ 0
Deferred revenue balance	872,000	0
Cost of goods sold generated from shipping	14,315,000		7,302,000
Inventory write-down	0		0
Debt fee	668,000	1,372,000
Amortization of deferred financing cost	60,000		106,000
Accretion of debt discount costs	56,000			$ 0
Provisional benefit from Tax Reform Act		8,500,000
Recognized income tax interest and penalties	0		$ 0
Probable environmental matters	$ 0	$ 0
Number of operating segments | segment	1
Antidilutive securities excluded from computation of earnings per share (in shares) | shares	252		10
Take-or-pay Contracts
Disaggregation of Revenue [Line Items]
Revenue recognized for shortfall payments relating to minimum commitments	$ 0		$ 0
Transferred at Point in Time | Product Concentration Risk | Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	68.00%		67.00%
Transferred at Point in Time | Rail Car Rental And Transportation | Product Concentration Risk | Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	32.00%		33.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected percent of revenue recognized	42.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected percent of revenue recognized	58.00%

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