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Environmental Matters (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) DisposalSite | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Environmental Remediation Obligations [Abstract] |  |  |
Number of disposal sites | DisposalSite | 19 |  |
Environmental expenses | $ 9,000 | $ 7,000 | $ 9,000
Environmental liabilities | $ 10,345 | $ 11,879 |

X
- Definition Carrying value of the obligation (known or estimated) related to remediation costs as well as normal recurring expenses such as licensing, testing and waste disposal fees. + References No definition available. + Details
Name: | r_AccruedEnvironmentalLiabilities
Namespace Prefix: | r_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. Also includes normal recurring expenses such as licensing, testing and waste disposal fees. + References No definition available. + Details
Name: | r_EnvironmentalExpenses
Namespace Prefix: | r_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of disposal sites. + References No definition available. + Details
Name: | r_NumberOfDisposalSites
Namespace Prefix: | r_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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