Acquisitions - Additional Information (Detail) $ in Thousands		12 Months Ended
	Dec. 20, 2023 USD ($) Carrier	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Amortization expense of intangible assets		$ 27,200	$ 26,600
Revenue		4,202,585	5,340,490	$ 4,232,383
Operating income		212,231	$ 474,721	$ 238,457
Forward Air Final Mile Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition date	Dec. 20, 2023
Percentage of equity interests acquired	100.00%
Consideration for transaction	$ 261,000
Number of network carriers | Carrier	350
Goodwill and other intangible assets tax deductible, period	15 years
Amortization expense of intangible assets		$ 400
Intangible assets, weighted average useful life		14 years 4 months 13 days
Revenue		$ 6,400
Operating income		200
Forward Air Final Mile Acquisition [Member] | General and Administrative Expense [Member]
Business Acquisition [Line Items]
Business acquisition, related costs		$ 5,100