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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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