Share-Based Compensation Plans Compensation expense recognized for market-based cash awards (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Cash awards	$ 124	$ 119	$ 245	$ 447

The amount of expense, recognized during the period arising from market-based cash awards with employees, directors and certain consultants qualifying for treatment as employees.

No definition available.

Name:	r_EmployeeServiceCompensationCashAwards
Namespace Prefix:	r_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration