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Components of Other Intangible Acquired (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 145,423
Finite-lived intangible assets, Accumulated Amortization	10,635
Finite-lived intangible assets, Net Carrying Value	134,788
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	144,123	$ 71,581
Finite-lived intangible assets, Accumulated Amortization	10,563	6,834
Finite-lived intangible assets, Net Carrying Value	133,560	$ 64,747
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	1,300
Finite-lived intangible assets, Accumulated Amortization	72
Finite-lived intangible assets, Net Carrying Value	$ 1,228
Intangible assets estimated useful life	18 months
CaseStack, Inc. [Member] | Customer Relationships [Member] | Logistics [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 65,600
Finite-lived intangible assets, Accumulated Amortization	547
Finite-lived intangible assets, Net Carrying Value	$ 65,053
Intangible assets estimated useful life	10 years
CaseStack, Inc. [Member] | Customer Relationships [Member] | Transportation [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 8,700
Finite-lived intangible assets, Accumulated Amortization	145
Finite-lived intangible assets, Net Carrying Value	$ 8,555
Intangible assets estimated useful life	5 years
CaseStack, Inc. [Member] | Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 1,300
Finite-lived intangible assets, Accumulated Amortization	72
Finite-lived intangible assets, Net Carrying Value	$ 1,228
Intangible assets estimated useful life	18 months

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