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Interim Financial Statements - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 30, 2018 Segment | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reporting business segments | Segment | 2 |  |  |
Capitalized commission fees |  |  | $ 400,000 |
Capitalized commission fees, amount of amortization |  |  | $ 54,000 |
Number of railheads |  |  | one or more |
(ASC) topic 606 | Restatement Adjustment [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Effective change on revenue and transportation costs |  | $ 700,000 |  | $ 2,200,000

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