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Segment and Geographical Information - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) segment core_business_area
Segment Reporting [Abstract] |
Number of reportable segments | segment | 5
Sales of timberland (exceed) | $ | $ 20
Trading |
Segment Reporting Information [Line Items] |
Number of core business areas | core_business_area | 2

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- Definition Number of Core Business Areas + References No definition available. + Details
Name: | ryn_NumberofCoreBusinessAreas
Namespace Prefix: | ryn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of Timberlands Reclassification Threshold + References No definition available. + Details
Name: | ryn_SaleofTimberlandsReclassificationThreshold
Namespace Prefix: | ryn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ryn_TradingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |