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Components of Other Intangible Acquired (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 202,159	$ 145,423
Finite-lived intangible assets, Accumulated Amortization	38,206	24,456
Finite-lived intangible assets, Net Carrying Value	163,953	120,967
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	196,806	144,123
Finite-lived intangible assets, Accumulated Amortization	36,765	23,517
Finite-lived intangible assets, Net Carrying Value	160,041	120,606
Agent Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	2,432
Finite-lived intangible assets, Accumulated Amortization	51
Finite-lived intangible assets, Net Carrying Value	$ 2,381
Intangible assets estimated useful life	4 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 2,921	1,300
Finite-lived intangible assets, Accumulated Amortization	1,390	939
Finite-lived intangible assets, Net Carrying Value	$ 1,531	$ 361
Intangible assets estimated useful life	18 months	18 months
Nonstop Delivery ,LLC [Member] | Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 52,683
Finite-lived intangible assets, Accumulated Amortization	293
Finite-lived intangible assets, Net Carrying Value	$ 52,390
Intangible assets estimated useful life	15 years
Nonstop Delivery ,LLC [Member] | Agent Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 2,432
Finite-lived intangible assets, Accumulated Amortization	51
Finite-lived intangible assets, Net Carrying Value	$ 2,381
Intangible assets estimated useful life	4 years
Nonstop Delivery ,LLC [Member] | Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 1,621
Finite-lived intangible assets, Accumulated Amortization	90
Finite-lived intangible assets, Net Carrying Value	$ 1,531
Intangible assets estimated useful life	18 months

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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