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Schedule V - AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations), Parenthetical (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment Income, Net [Abstract] |  |  |
Premiums Earned, Net | $ 191,894 | $ 197,117 | $ 124,336
Property Casualty Insurance Operations [Member] | Amerco [Member] |  |  |
Investment Income, Net [Abstract] |  |  |
Written premiums, net | 1,500 | 3,100 | 2,800
Premiums Earned, Net | 1,800 | 2,800 | 2,600
(Gain) Loss on Investments | $ 100 | $ 400 | $ 3,000

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