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Long-Term Water Assets - Tangible Water Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Long Lived Assets Held-for-sale [Line Items] |  |
Total water held for future use at cost | $ 28,135 | $ 24,633
Banked water and water for future delivery |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total water held for future use at cost | 25,208 | 24,597
Transferable water |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Total water held for future use at cost | $ 2,927 | $ 36

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- Definition Tangible Water Assets, Banked Water and Water Contract Rights + References No definition available. + Details
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Namespace Prefix: | trc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=trc_BankedWaterAndWaterForFutureDeliveryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=trc_TransferableWaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |