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Related Party Transactions (Narratives) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Sac Holdings [Member] |  |  |  |  |  |
Related party notes receivable: |  |  |  |  |  |
Notes receivable outstanding |  | $ 48,429 |  | $ 48,429 |  | $ 49,322
Related party costs and expenses: |  |  |  |  |  |
Expenses, related parties |  | 684 | $ 654 | 2,056 | $ 1,962 |
Commission expenses, generated from dealer agreement with related parties |  | 12,135 | 11,521 | 42,843 | 40,780 |
Private Mini [Member] |  |  |  |  |  |
Related party costs and expenses: |  |  |  |  |  |
Commission expenses, generated from dealer agreement with related parties |  | 848 | $ 841 | 3,021 | 2,879 |
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |  |  |  |  |  |
Related party costs and expenses: |  |  |  |  |  |
Revenue, excluding dealer agreement commissions and expenses |  |  |  | 21,400 |  |
Expenses, related parties |  |  |  | 2,100 |  |
Cash flow, related party |  |  |  | 19,900 |  |
Revenue, generated by the dealer agreement from related parties |  |  |  | 212,800 |  |
Commission expenses, generated from dealer agreement with related parties |  |  |  | 45,900 |  |
AMERCO [Member] | Private Mini [Member] |  |  |  |  |  |
Related party notes receivable: |  |  |  |  |  |
Cash interest payments |  |  |  | 1,500 |  |
One time cash interest proceeds | $ 56,800 |  |  |  |  |
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |  |  |  |  |
Management fees revenue: |  |  |  |  |  |
Management fees received exclusive of reimbursed expenses |  |  |  | $ 21,800 | $ 21,400 |
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member] |  |  |  |  |  |
Management fees revenue: |  |  |  |  |  |
Management fee rate |  |  |  | 4.00% | 4.00% |
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member] |  |  |  |  |  |
Management fees revenue: |  |  |  |  |  |
Management fee rate |  |  |  | 10.00% | 10.00% |
Various Subsidiaries of Amerco [Member] | Sac Holdings [Member] |  |  |  |  |  |
Related party notes receivable: |  |  |  |  |  |
Cash interest payments |  |  |  | $ 3,400 | $ 3,400 |
Largest aggregate balance in reporting period |  | 49,300 |  | 49,300 |  |
Notes receivable outstanding |  | $ 48,400 |  | $ 48,400 |  |
Earliest maturity year |  |  |  | 2017 |  |

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