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Long Term Water Assets - Tangible Water Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Long Lived Assets Held For Sale [Line Items] |  |
Total water held for future use at cost | $ 18,571 | $ 13,854
Banked water and water for future delivery |  |
Long Lived Assets Held For Sale [Line Items] |  |
Total water held for future use at cost | 5,220 | 4,779
Transferable water |  |
Long Lived Assets Held For Sale [Line Items] |  |
Total water held for future use at cost | $ 13,351 | $ 9,075

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

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- Details
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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: |