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Consolidating financial information by industry segment (Balance Sheets) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | --- | --- | --- | ---
ASSETS: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 673,701 |  |  | $ 759,388 |  |  | $ 697,806 |  | $ 600,646 |
Reinsurance recoverables and trade receivables, net |  | 224,785 |  |  | 193,538 |  |  |  |  |  |
Inventories, net |  | 103,504 |  |  | 89,877 |  |  |  |  |  |
Prepaid expenses |  | 174,100 |  |  | 166,129 |  |  |  |  |  |
Investments, fixed maturities and marketable equities |  | 2,235,397 |  |  | 1,919,860 |  |  |  |  |  |
Investments, other |  | 300,736 |  |  | 399,064 |  |  |  |  |  |
Deferred policy acquisition costs, net |  | 136,276 |  |  | 124,767 |  |  |  |  |  |
Other assets |  | 78,354 |  |  | 244,782 |  |  |  |  |  |
Related party assets |  | 30,889 |  |  | 33,276 |  |  |  |  |  |
Subtotal assets |  | 3,957,742 |  |  | 3,930,681 |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Land |  | 976,454 |  |  | 827,649 |  |  |  |  |  |
Buildings and improvements |  | 4,003,726 |  |  | 3,140,713 |  |  |  |  |  |
Furniture and equipment |  | 689,780 |  |  | 632,803 |  |  |  |  |  |
Property, plant and equipment (gross) |  | 11,022,027 |  |  | 9,537,883 |  |  |  |  |  |
Less: Accumulated depreciation |  | (3,088,056) |  |  | (2,721,142) |  |  |  |  |  |
Total property, plant and equipment |  | 7,933,971 |  |  | 6,816,741 |  |  |  |  |  |
Total assets |  | 11,891,713 |  |  | 10,747,422 |  |  | 9,405,840 |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  | 556,873 |  |  | 511,115 |  |  |  |  |  |
Notes, loans and leases payable |  | 4,163,323 |  |  | 3,513,076 |  |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  | 1,011,183 |  |  | 1,248,033 |  |  |  |  |  |
Liabilities from investment contracts |  | 1,666,742 |  |  | 1,364,066 |  |  |  |  |  |
Other policyholders' funds and liabilities |  | 15,047 |  |  | 10,040 |  |  |  |  |  |
Deferred income |  | 35,186 |  |  | 34,276 |  |  |  |  |  |
Deferred income taxes |  | 750,970 |  |  | 658,108 |  |  |  |  |  |
Related party liabilities |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  | 8,199,324 |  |  | 7,338,714 |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | 453,326 |  |  | 452,746 |  |  |  |  |  |
Accumulated other comprehensive loss |  | (66,698) |  |  | (4,623) |  |  |  |  |  |
Retained earnings |  | 3,976,962 |  |  | 3,635,561 |  |  |  |  |  |
Unearned employee stock ownership plan shares |  | (4,048) |  |  | (7,823) |  |  |  |  |  |
Total stockholders' equity |  | 3,692,389 |  |  | 3,408,708 |  |  |  |  |  |
Total liabilities and stockholders' equity |  | 11,891,713 |  |  | 10,747,422 |  |  |  |  |  |
Rental Trailers and Other Rental Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  | 590,039 |  |  | 545,968 |  |  |  |  |  |
Rental Trucks [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  | 4,762,028 |  |  | 4,390,750 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Series A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Amerco Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  | 10,497 |  |  | 10,497 |  |  |  |  |  |
Common Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  | (525,663) |  |  | (525,653) |  |  |  |  |  |
Preferred Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  | (151,997) |  |  | (151,997) |  |  |  |  |  |
Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  |  |  | $ 229,958 |  |  | $ 234,359 |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] |  |  |  |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 643,918 |  |  | 702,036 |  |  | 671,665 |  | 585,666 |
Reinsurance recoverables and trade receivables, net |  | 90,832 |  |  | 64,798 |  |  |  |  |  |
Inventories, net |  | 103,504 |  |  | 89,877 |  |  |  |  |  |
Prepaid expenses |  | 174,100 |  |  | 166,129 |  |  |  |  |  |
Investments, fixed maturities and marketable equities |  |  |  |  |  |  |  |  |  |  |
Investments, other |  | 23,013 |  |  | 22,992 |  |  |  |  |  |
Deferred policy acquisition costs, net |  |  |  |  |  |  |  |  |  |  |
Other assets |  | 72,768 |  |  | 241,493 |  |  |  |  |  |
Related party assets |  | 35,997 |  |  | 40,003 |  |  |  |  |  |
Subtotal assets |  | 1,144,132 |  |  | 1,327,328 |  |  |  |  |  |
Investments in subsidiaries |  | 534,157 |  |  | 544,151 |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Land |  | 976,454 |  |  | 827,649 |  |  |  |  |  |
Buildings and improvements |  | 4,003,726 |  |  | 3,140,713 |  |  |  |  |  |
Furniture and equipment |  | 689,780 |  |  | 632,803 |  |  |  |  |  |
Property, plant and equipment (gross) |  | 11,022,027 |  |  | 9,537,883 |  |  |  |  |  |
Less: Accumulated depreciation |  | (3,088,056) |  |  | (2,721,142) |  |  |  |  |  |
Total property, plant and equipment |  | 7,933,971 |  |  | 6,816,741 |  |  |  |  |  |
Total assets |  | 9,612,260 |  |  | 8,688,220 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  | 548,099 |  |  | 506,158 |  |  |  |  |  |
Notes, loans and leases payable |  | 4,163,323 |  |  | 3,513,076 |  |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  | 407,934 |  |  | 568,456 |  |  |  |  |  |
Liabilities from investment contracts |  |  |  |  |  |  |  |  |  |  |
Other policyholders' funds and liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred income |  | 35,186 |  |  | 34,276 |  |  |  |  |  |
Deferred income taxes |  | 741,644 |  |  | 629,389 |  |  |  |  |  |
Related party liabilities |  | 25,446 |  |  | 28,157 |  |  |  |  |  |
Total liabilities |  | 5,921,632 |  |  | 5,279,512 |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | 453,536 |  |  | 452,956 |  |  |  |  |  |
Accumulated other comprehensive loss |  | (68,459) |  |  | (4,623) |  |  |  |  |  |
Retained earnings |  | 3,976,752 |  |  | 3,635,351 |  |  |  |  |  |
Unearned employee stock ownership plan shares |  | (4,048) |  |  | (7,823) |  |  |  |  |  |
Total stockholders' equity |  | 3,690,628 |  |  | 3,408,708 |  |  |  |  |  |
Total liabilities and stockholders' equity |  | 9,612,260 |  |  | 8,688,220 |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  | 590,039 |  |  | 545,968 |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Rental Trucks [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  | 4,762,028 |  |  | 4,390,750 |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Series A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Amerco Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  | 10,497 |  |  | 10,497 |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Common Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  | (525,653) |  |  | (525,653) |  |  |  |  |  |
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Preferred Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  | (151,997) |  |  | (151,997) |  |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 5,757 | [1] |  | 6,639 | [2] |  | 12,725 | [3] | 14,049 | [3]
Reinsurance recoverables and trade receivables, net |  | 102,120 | [1] |  | 99,682 | [2] |  |  |  |  |
Inventories, net |  |  | [1] |  |  | [2] |  |  |  |  |
Prepaid expenses |  |  | [1] |  |  | [2] |  |  |  |  |
Investments, fixed maturities and marketable equities |  | 279,641 | [1] |  | 285,846 | [2] |  |  |  |  |
Investments, other |  | 74,679 | [1] |  | 65,553 | [2] |  |  |  |  |
Deferred policy acquisition costs, net |  |  | [1] |  |  | [2] |  |  |  |  |
Other assets |  | 2,456 | [1] |  | 685 | [2] |  |  |  |  |
Related party assets |  | 6,639 | [1] |  | 6,959 | [2] |  |  |  |  |
Subtotal assets |  | 471,292 | [1] |  | 465,364 | [2] |  |  |  |  |
Investments in subsidiaries |  |  | [1] |  |  | [2] |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Land |  |  | [1] |  |  | [2] |  |  |  |  |
Buildings and improvements |  |  | [1] |  |  | [2] |  |  |  |  |
Furniture and equipment |  |  | [1] |  |  | [2] |  |  |  |  |
Property, plant and equipment (gross) |  |  | [1] |  |  | [2] |  |  |  |  |
Less: Accumulated depreciation |  |  | [1] |  |  | [2] |  |  |  |  |
Total property, plant and equipment |  |  | [1] |  |  | [2] |  |  |  |  |
Total assets |  | 471,292 | [1] |  | 465,364 | [2] |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  | 2,844 | [1] |  | 2,582 | [2] |  |  |  |  |
Notes, loans and leases payable |  |  | [1] |  |  | [2] |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  | 229,958 | [1] |  | 234,359 | [2] |  |  |  |  |
Liabilities from investment contracts |  |  | [1] |  |  | [2] |  |  |  |  |
Other policyholders' funds and liabilities |  | 5,259 | [1] |  | 5,377 | [2] |  |  |  |  |
Deferred income |  |  | [1] |  |  | [2] |  |  |  |  |
Deferred income taxes |  | 6,961 | [1] |  | 8,927 | [2] |  |  |  |  |
Related party liabilities |  | 3,836 | [1] |  | 2,870 | [2] |  |  |  |  |
Total liabilities |  | 248,858 | [1] |  | 254,115 | [2] |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | 91,120 | [1] |  | 91,120 | [2] |  |  |  |  |
Accumulated other comprehensive loss |  | (3,721) | [1] |  | 16,526 | [2] |  |  |  |  |
Retained earnings |  | 131,734 | [1] |  | 100,302 | [2] |  |  |  |  |
Unearned employee stock ownership plan shares |  |  | [1] |  |  | [2] |  |  |  |  |
Total stockholders' equity |  | 222,434 | [1] |  | 211,249 | [2] |  |  |  |  |
Total liabilities and stockholders' equity |  | 471,292 | [1] |  | 465,364 | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Rental Trucks [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Series A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Amerco Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  | 3,301 | [1] |  | 3,301 | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Common Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Property and Casualty Insurance [Member] | Preferred Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 24,026 | [1] |  | 50,713 | [2] |  | $ 13,416 | [3] | $ 931 | [3]
Reinsurance recoverables and trade receivables, net |  | 31,833 | [1] |  | 29,058 | [2] |  |  |  |  |
Inventories, net |  |  | [1] |  |  | [2] |  |  |  |  |
Prepaid expenses |  |  | [1] |  |  | [2] |  |  |  |  |
Investments, fixed maturities and marketable equities |  | 1,955,756 | [1] |  | 1,634,014 | [2] |  |  |  |  |
Investments, other |  | 203,044 | [1] |  | 310,519 | [2] |  |  |  |  |
Deferred policy acquisition costs, net |  | 136,276 | [1] |  | 124,767 | [2] |  |  |  |  |
Other assets |  | 3,130 | [1] |  | 2,604 | [2] |  |  |  |  |
Related party assets |  | 16,466 | [1] |  | 18,334 | [2] |  |  |  |  |
Subtotal assets |  | 2,370,531 | [1] |  | 2,170,009 | [2] |  |  |  |  |
Investments in subsidiaries |  |  | [1] |  |  | [2] |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Land |  |  | [1] |  |  | [2] |  |  |  |  |
Buildings and improvements |  |  | [1] |  |  | [2] |  |  |  |  |
Furniture and equipment |  |  | [1] |  |  | [2] |  |  |  |  |
Property, plant and equipment (gross) |  |  | [1] |  |  | [2] |  |  |  |  |
Less: Accumulated depreciation |  |  | [1] |  |  | [2] |  |  |  |  |
Total property, plant and equipment |  |  | [1] |  |  | [2] |  |  |  |  |
Total assets |  | 2,370,531 | [1] |  | 2,170,009 | [2] |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  | 5,930 | [1] |  | 2,375 | [2] |  |  |  |  |
Notes, loans and leases payable |  |  | [1] |  |  | [2] |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  | 373,291 | [1] |  | 445,218 | [2] |  |  |  |  |
Liabilities from investment contracts |  | 1,666,742 | [1] |  | 1,364,066 | [2] |  |  |  |  |
Other policyholders' funds and liabilities |  | 9,788 | [1] |  | 4,663 | [2] |  |  |  |  |
Deferred income |  |  | [1] |  |  | [2] |  |  |  |  |
Deferred income taxes |  | 2,365 | [1] |  | 19,792 | [2] |  |  |  |  |
Related party liabilities |  | 692 | [1] |  | 993 | [2] |  |  |  |  |
Total liabilities |  | 2,058,808 | [1] |  | 1,837,107 | [2] |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  | 26,271 | [1] |  | 26,271 | [2] |  |  |  |  |
Accumulated other comprehensive loss |  | (5,300) | [1] |  | 35,982 | [2] |  |  |  |  |
Retained earnings |  | 288,252 | [1] |  | 268,149 | [2] |  |  |  |  |
Unearned employee stock ownership plan shares |  |  | [1] |  |  | [2] |  |  |  |  |
Total stockholders' equity |  | 311,723 | [1] |  | 332,902 | [2] |  |  |  |  |
Total liabilities and stockholders' equity |  | 2,370,531 | [1] |  | 2,170,009 | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Rental Trucks [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Series A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Amerco Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  | 2,500 | [1] |  | 2,500 | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Common Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  |  | [1] |  |  | [2] |  |  |  |  |
Operating Segments [Member] | Life Insurance [Member] | Preferred Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  |  | [1] |  |  | [2] |  |  |  |  |
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
ASSETS: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |
Reinsurance recoverables and trade receivables, net |  |  |  |  |  |  |  |  |  |  |
Inventories, net |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  |  |  |  |  |  |  |
Investments, fixed maturities and marketable equities |  |  |  |  |  |  |  |  |  |  |
Investments, other |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs, net |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |
Related party assets | [4] | (28,213) |  |  | (32,020) |  |  |  |  |  |
Subtotal assets |  | (28,213) |  |  | (32,020) |  |  |  |  |  |
Investments in subsidiaries | [5] | (534,157) |  |  | (544,151) |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |
Buildings and improvements |  |  |  |  |  |  |  |  |  |  |
Furniture and equipment |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment (gross) |  |  |  |  |  |  |  |  |  |  |
Less: Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Total assets |  | (562,370) |  |  | (576,171) |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  |  |  |  |
Notes, loans and leases payable |  |  |  |  |  |  |  |  |  |  |
Policy benefits and losses, claims and loss expenses payable |  |  |  |  |  |  |  |  |  |  |
Liabilities from investment contracts |  |  |  |  |  |  |  |  |  |  |
Other policyholders' funds and liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred income |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |
Related party liabilities | [4] | (29,974) |  |  | (32,020) |  |  |  |  |  |
Total liabilities |  | (29,974) |  |  | (32,020) |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital | [5] | (117,601) |  |  | (117,601) |  |  |  |  |  |
Accumulated other comprehensive loss | [5] | 10,782 |  |  | (52,508) |  |  |  |  |  |
Retained earnings | [5] | (419,776) |  |  | (368,241) |  |  |  |  |  |
Unearned employee stock ownership plan shares |  |  |  |  |  |  |  |  |  |  |
Total stockholders' equity |  | (532,396) |  |  | (544,151) |  |  |  |  |  |
Total liabilities and stockholders' equity |  | (562,370) |  |  | (576,171) |  |  |  |  |  |
Eliminations [Member] | Rental Trailers and Other Rental Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  |  |  |  |  |  |  |  |  |  |
Eliminations [Member] | Rental Trucks [Member] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |  |  |  |
Property subject to or available for operating lease, gross |  |  |  |  |  |  |  |  |  |  |
Eliminations [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Eliminations [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Eliminations [Member] | Series A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  |  |  |  |  |  |  |  |  |  |
Eliminations [Member] | Amerco Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued | [5] | (5,801) |  |  | (5,801) |  |  |  |  |  |
Eliminations [Member] | Common Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  |  |  |  |  |  |  |  |  |  |
Eliminations [Member] | Preferred Stock in Treasury [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  |  |  |  |  |  |  |  |  |  |
[1] | Balances as of December 31, 2018
[2] | Balances as of December 31, 2016
[3] | Balance for the period ended December 31, 2016
[4] | Eliminate intercompany receivables and payables
[5] | Eliminate investment in subsidiaries

X
- Definition This extended concept is a combination of two concepts on the US-GAAP taxonomy. (1) Reinsurance Recoverables defined as..."The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance." (2) Receivables, Net, Current defined as..."The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowance established for the purpose of reducing such receivables to an amount that approximates their net realizable value" + References No definition available. + Details
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- Definition On our HTML document, we leave this field name blank. It is considered the sum of all assets prior to our listing all Property, Plant and Equipment items. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(1),(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 + Details
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- Definition Amount, after accumulated amortization, of deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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