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Postretirement Benefits Other than Pensions - General Information (Details) - Postretirement Health Coverage [Member] - age | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2001
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, funding status | us-gaap:UnfundedPlanMember |
Minimum age of retirement under option one to avail benefit of post retirement | 55 years |
Minimum service period served at the time of retirement under option one to avail benefit of post retirement | 15 years |
Minimum age of retirement under option two to avail benefit of post retirement | 65 |
Minimum service period served at time of retirement under option two to avail benefit of post retirement | 10 years |
Minimum for age plus years of service of retirement under amended plan to avail benefit of post retirement |  | 60
Minimum service period served at the time of retirement under amended plan to avail benefit of post retirement |  | 10 years

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- Definition Minimum retirement age to receive benefits if participant has reached fifteen years of service. + References No definition available. + Details
Name: | rhp_MinimumAgeOfRetirementUnderOptionOneToAvailBenefitOfPostRetirement
Namespace Prefix: | rhp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum retirement age to receive benefits if participant has reached ten years of service. + References No definition available. + Details
Name: | rhp_MinimumAgeOfRetirementUnderOptionTwoToAvailBenefitOfPostRetirement
Namespace Prefix: | rhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum of age plus years of service for eligibility under the plan when the plan was amended in 2001. + References No definition available. + Details
Name: | rhp_MinimumForAgePlusYearsOfServiceOfRetirementUnderAmendedPlanToAvailBenefitOfPostRetirement
Namespace Prefix: | rhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum years of service for eligibility under the plan when the plan was amended in 2001. + References No definition available. + Details
Name: | rhp_MinimumServicePeriodServedAtTimeOfRetirementUnderOptionAmendedPlanToAvailBenefitOfPostRetirement
Namespace Prefix: | rhp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Service requirement for a participant to retire at age 55 and receive benefits. + References No definition available. + Details
Name: | rhp_MinimumServicePeriodServedAtTimeOfRetirementUnderOptionOneToAvailBenefitOfPostRetirement
Namespace Prefix: | rhp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Service requirement for a participant to retire at age 65 and receive benefits. + References No definition available. + Details
Name: | rhp_MinimumServicePeriodServedAtTimeOfRetirementUnderOptionTwoToAvailBenefitOfPostRetirement
Namespace Prefix: | rhp_
Data Type: | xbrli:durationItemType
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates status of funding for defined benefit plan designed to provide retirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFundingStatusExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |