Employee Benefit Plans - Multiemployer Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Western Conference Teamsters
Defined Benefit Plan Disclosure [Line Items]
Employer Identification Number	91-6145047
Pension Protection Act Zone Status	Green	Green
FIP/RP Status Pending/ Implemented	No
Ryder Contributions	$ 3,488	$ 3,245	$ 2,613
Surcharge Imposed	No
Expiration Date(s) of Collective-Bargaining Agreement(s)	01/12/18 to 03/31/21
IAM National
Defined Benefit Plan Disclosure [Line Items]
Employer Identification Number	51-6031295
Pension Protection Act Zone Status	Green	Green
FIP/RP Status Pending/ Implemented	No
Ryder Contributions	$ 3,953	$ 3,891	4,162
Surcharge Imposed	No
Expiration Date(s) of Collective-Bargaining Agreement(s)	03/31/17 to 11/30/19
Automobile Mechanics Local No. 701
Defined Benefit Plan Disclosure [Line Items]
Employer Identification Number	36-6042061
Pension Protection Act Zone Status	Yellow	Yellow
FIP/RP Status Pending/ Implemented	FIP Adopted
Ryder Contributions	$ 1,435	$ 2,048	2,201
Surcharge Imposed	Yes
Expiration Date(s) of Collective-Bargaining Agreement(s)	10/31/17 to 05/31/19
Other funds
Defined Benefit Plan Disclosure [Line Items]
Ryder Contributions	$ 931	915	760
Union-administered plans
Defined Benefit Plan Disclosure [Line Items]
Ryder Contributions	9,807	10,099	9,736
Pension settlement (benefit) charges	(481)	5,454	(139)
Postretirement benefit income	$ 9,326	$ 15,553	$ 9,597