Acquisition - Summarizes the Preliminary Allocation of Total Consideration to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands		6 Months Ended
	Dec. 20, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Business Acquisition [Line Items]
Goodwill		$ 771,894		$ 733,695
Lease liability - operating leases long-term		163,669		$ 177,699
Cash paid, net		$ (3,701)	$ (108)
Forward Air Final Mile Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable trade	$ 28,355
Prepaid expenses and other current assets	2,305
Property and equipment	2,792
Right of use assets - operating leases	15,258
Other intangibles	94,700
Goodwill	142,122
Other assets	173
Total assets acquired	285,705
Accounts payable trade	155
Accounts payable other	2,298
Accrued payroll	1,271
Accrued other	9,488
Lease liability - operating leases short-term	5,697
Other long term liabilities	19
Lease liability - operating leases long-term	9,560
Total liabilities assumed	28,488
Total consideration, net	257,217
Cash paid, net	$ 257,217