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Acquisition - Components of Other Intangible Acquired (Detail) - Nonstop Delivery, LLC [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 46,200
Finite-lived intangible assets, Accumulated Amortization	2,567
Finite-lived intangible assets, Net Carrying Value	$ 43,633
Intangible assets estimated useful life	15 years
Agent Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 600
Finite-lived intangible assets, Accumulated Amortization	125
Finite-lived intangible assets, Net Carrying Value	$ 475
Intangible assets estimated useful life	4 years
Trade Name [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	$ 900
Finite-lived intangible assets, Accumulated Amortization	500
Finite-lived intangible assets, Net Carrying Value	$ 400
Intangible assets estimated useful life	18 months

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- Definition

Other intangible assets.

+ References

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+ References

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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/disclosureRef
-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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Subparagraph (a)(1)
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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