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Components of Other Intangible Acquired (Detail) - CaseStack, Inc. [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Customer Relationships [Member] | Logistics [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 65,600
Finite-lived intangible assets, Accumulated Amortization	2,187
Finite-lived intangible assets, Net Carrying Value	$ 63,413
Intangible assets estimated useful life	10 years
Customer Relationships [Member] | Transportation [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 8,700
Finite-lived intangible assets, Accumulated Amortization	580
Finite-lived intangible assets, Net Carrying Value	$ 8,120
Intangible assets estimated useful life	5 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 1,300
Finite-lived intangible assets, Accumulated Amortization	289
Finite-lived intangible assets, Net Carrying Value	$ 1,011
Intangible assets estimated useful life	18 months

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