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Schedule V - U-Haul Holding Company and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) - Property Casualty Insurance Operations [Member] - U-Haul Holding Company [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplemental Information For Property And Casualty Insurance Underwriters [Abstract] |  |  |
Deferred policy acquisition costs | $ 0 | $ 0 | $ 0
Reserves for unpaid claims and claims adjustment expense | 151,874 | 159,162 | 177,963
Discount if any, deducted | 0 | 0 | 0
Unearned premiums | (97) | 334 | (294)
Net earned premiums (1) | 96,242 | 89,667 | 70,285
Net investment income (2) | 7,314 | 24,385 | 16,335
Claim and claim adjustment expenses incurred related to current year | 27,570 | 28,980 | 20,670
Prior years | (5,828) | (6,290) | (3,865)
Amortization of deferred policy acquisition costs | 0 | 0 | 0
Paid claims and claim adjustment expense | 22,965 | 24,012 | 25,759
Net premiums written (1) | $ 96,145 | $ 90,002 | $ 69,989

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- Definition Amount of amortization expense on deferred policy acquisition cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column I)) -URI https://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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- Definition Amount of loss reported and paid for claim and claim adjustment expense by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column J)) -URI https://asc.fasb.org/extlink&oid=120401096&loc=d3e575016-122915 + Details
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