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Leases, User Charges and Commitments - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 USD ($) Container | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Lease and Rental Expense [Line Items] |  |  |  |
Rental expense |  | $ 8,300,000 | $ 8,000,000 | $ 8,100,000
Rail transportation charges |  | 73,700,000 | 74,300,000 | 67,800,000
Minimum commitments on rail owned chassis and containers |  | 0 |  |
Purchase contract units, containers | Container | 4,000 |  |  |
Cost of purchasing containers | $ 40,000,000 |  |  |
Transportation Costs [Member] |  |  |  |
Lease and Rental Expense [Line Items] |  |  |  |
Rental expense |  | $ 3,600,000 | $ 11,900,000 | $ 13,100,000

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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(17)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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