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Acquisitions - Additional Information (Detail) $ in Millions		3 Months Ended
	Dec. 09, 2020 USD ($) Carrier	Mar. 31, 2021 USD ($)
Business Acquisition [Line Items]
Business acquisition, cash paid	$ 89.7
Post-Closing Activities	$ 0.1
Nonstop Delivery, LLC [Member]
Business Acquisition [Line Items]
Business acquisition date	Dec. 09, 2020
Percentage of equity interests acquired	100.00%
Consideration for transaction	$ 104.6
Settlement of accounts receivable due from subsidiary	$ 14.8
Number of network carriers | Carrier	170
Goodwill and other intangible assets tax deductible, period	15 years
Amortization of Intangible Assets		$ 0.8
Intangible assets, weighted average useful life		14 years 3 months 29 days

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