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Leases, User Charges and Commitments - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Lease and Rental Expense [Line Items] |  |  |  |
Rental expense | $ 10,600,000 | $ 9,500,000 | $ 8,100,000 |
Rail transportation charges | 80,400,000 | 77,600,000 | 73,700,000 |
Minimum commitments on rail owned chassis and containers | 0 |  |  |
Expected annual subleases income | 500,000 |  |  |
ASU No. 2016-02 [Member] | Subsequent Event [Member] |  |  |  |
Lease and Rental Expense [Line Items] |  |  |  |
Right-of-use asset |  |  |  | $ 29,000,000
Lease liability |  |  |  | 37,000,000
Estimated ROU assets and lease liabilities |  |  |  | $ 6,700
Transportation Costs [Member] |  |  |  |
Lease and Rental Expense [Line Items] |  |  |  |
Rental expense | $ 10,700,000 | $ 6,000,000.0 | $ 3,600,000 |

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