Related Party Transactions - Transactions (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) member	Dec. 31, 2024 USD ($) member	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Related party transactions
Revenues		$ 30,455,200	$ 29,527,400	$ 27,814,800
Proceeds from sale of property and equipment		26,200	30,700	32,300
Equity method investment, distribution		$ 99,100	169,900	356,600
Penske Corporation | Penske Truck Leasing Co LP
Related party transactions
Ownership interest in Penske Truck Leasing Company		41.10%
Mitsui and Co | Penske Truck Leasing Co LP
Related party transactions
Ownership interest in Penske Truck Leasing Company		30.00%
Related Party
Related party transactions
Other expenses		$ 6,000	5,300	5,100
Revenues		1,400	1,300	1,300
Receivables	$ 51	51	44
Payables	$ 600	$ 600	500
Corporate Joint Venture | Penske Truck Leasing Co LP
Related party transactions
Ownership percentage	28.90%	28.90%
Number of members on the advisory board | member		11
Number of members on the advisory committee the Company is entitled to | member	1	1
Pro rata quarterly distributions, percentage of net income	50.00%	50.00%
Partnership interest that my be transferred without complying with the right of first offer		9.02%
Equity method investment, distribution		$ 98,400	$ 168,800	$ 356,600
Corporate Joint Venture | Penske Truck Leasing Co LP
Related party transactions
Purchases of trucks and parts		34,900
Corporate Joint Venture | Premier Truck Group
Related party transactions
Purchases of trucks and parts		$ 5,000
Proceeds from sale of property and equipment	$ 6,900