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Share-Based Compensation Plans Compensation expense recognized for market-based cash awards (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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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

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- Definition 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. + References No definition available. + Details
Name: | r_EmployeeServiceCompensationCashAwards
Namespace Prefix: | r_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration