Components of Other Intangible Assets (Detail) - Estenson Logistics, LLC [Member] $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($)
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Amount	$ 66,000
Finite-lived intangible assets, Accumulated Amortization	1,100
Finite-lived intangible assets, Balance at September 30, 2017	$ 64,900
Intangible assets estimated useful life	15 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Amount	$ 400
Finite-lived intangible assets, Accumulated Amortization	$ 400
Intangible assets estimated useful life	3 months

Other intangible assets.

No definition available.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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