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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Interest rate swaps maturing June 2017 [Member] |  |
Summarized details of swaps outstanding and the related hedged items |  |
Issuance date | May 01, 2011 |
Maturity date | Jun. 01, 2017 |
Face value of medium - term notes | $ 350,000 |
Aggregate notional amount of interest rate swaps | 150,000 |
Fixed interest rate | 3.50% |
Weighted-average variable interest rate on hedged debt | 1.62% | 1.84%
Interest rate swaps maturing March 2015 [Member] |  |
Summarized details of swaps outstanding and the related hedged items |  |
Issuance date | Feb. 01, 2011 |
Maturity date | Mar. 01, 2015 |
Face value of medium - term notes | 350,000 |
Aggregate notional amount of interest rate swaps | 150,000 |
Fixed interest rate | 3.15% |
Weighted-average variable interest rate on hedged debt | 1.66% | 1.43%
Interest rate swaps maturing March 2013 [Member] |  |
Summarized details of swaps outstanding and the related hedged items |  |
Issuance date | Feb. 01, 2008 |
Maturity date | Mar. 01, 2013 |
Face value of medium - term notes | 250,000 |
Aggregate notional amount of interest rate swaps | $ 250,000 |
Fixed interest rate | 6.00% |
Weighted-average variable interest rate on hedged debt | 2.84% | 2.61%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Derivative weighted average variable interest rate on hedge item. + References No definition available. + Details
Name: | r_DerivativeWeightedAverageVariableInterestRateOnHedgeItem
Namespace Prefix: | r_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Period Type: | duration

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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
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Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
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