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Consolidated Balance Sheet by Industry Segment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
ASSETS:        
Cash and cash equivalents $ 495,112 $ 463,744 $ 357,180 $ 382,514
Reinsurance recoverables and trade receivables, net 199,322 261,789    
Inventories, net 67,020 56,396    
Prepaid expenses 55,269 57,451    
Investments, fixed maturities and marketable equities 1,138,275 1,095,338    
Investments, other 248,850 241,765    
Deferred policy acquisition costs, net 118,707 93,043    
Other assets 97,588 99,986    
Related party assets 169,624 182,035    
Subtotal assets 2,589,767 2,551,547    
Investments in subsidiaries 0 0    
Property, plant and equipment, at cost:        
Land 405,177 333,228    
Buildings and improvements 1,430,330 1,197,875    
Furniture and equipment 322,088 311,142    
Property, plant and equipment (gross) 5,141,717 4,314,409    
Less: Accumulated depreciation (1,732,506) (1,559,355)    
Total property, plant and equipment 3,409,211 2,755,054    
Total assets 5,998,978 5,306,601 4,654,051  
Liabilities:        
Accounts payable and accrued expenses 357,954 358,491    
Notes, loans and leases payable 1,942,359 1,661,845    
Policy benefits and losses, claims and loss expenses payable 1,082,598 1,115,048    
Liabilities from investment contracts 616,725 510,789    
Other policyholders' funds and liabilities 7,988 7,294    
Deferred income 31,390 30,217    
Deferred income taxes 432,596 393,658    
Total liabilities 4,471,610 4,077,342    
Stockholders' equity:        
Additional paid-in capital 444,210 438,168    
Accumulated other comprehensive loss (53,923) (22,680)    
Retained earnings 1,805,453 1,482,630    
Unearned employee stock ownership plan shares (1,219) (1,706)    
Total stockholders' equity 1,527,368 1,229,259    
Total liabilities and stockholders' equity 5,998,978 5,306,601    
Rental Trailers and Other Rental Equipment [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 373,325 317,476    
Rental Trucks [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 2,610,797 2,154,688    
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          
Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued 10,497 10,497    
Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value (525,653) (525,653)    
Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value (151,997) (151,997)    
AMERCO [Member]
        
ASSETS:        
Cash and cash equivalents 321,544 327,119 201,502 250,104
Related party assets 1,150,671 1,032,124    
Investments in subsidiaries 493,612 240,080    
Property, plant and equipment, at cost:        
Total assets 1,984,539 1,643,164    
Liabilities:        
Total liabilities 455,952 412,199    
Stockholders' equity:        
Additional paid-in capital 444,420 438,378    
Accumulated other comprehensive loss (53,923) (22,680)    
Retained earnings 1,805,243 1,482,420 1,316,854  
Total stockholders' equity 1,528,587 1,230,965    
Total liabilities and stockholders' equity 1,984,539 1,643,164    
AMERCO [Member] | Series A Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued 0 0    
AMERCO [Member] | Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued 10,497 10,497    
AMERCO [Member] | Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value (525,653) (525,653)    
AMERCO [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 12,758 [1] 14,120 [2] 22,542 [3] 21,718 [4]
Reinsurance recoverables and trade receivables, net 142,335 [1] 186,010 [2]    
Inventories, net 0 [1] 0 [2]    
Prepaid expenses 0 [1] 0 [2]    
Investments, fixed maturities and marketable equities 192,173 [1] 160,455 [2]    
Investments, other 54,674 [1] 65,212 [2]    
Deferred policy acquisition costs, net 0 [1] 0 [2]    
Other assets 1,991 [1] 1,212 [2]    
Related party assets 13,011 [1] 8,846 [2]    
Subtotal assets 416,942 [1] 435,855 [2]    
Investments in subsidiaries 0 [1] 0 [2]    
Property, plant and equipment, at cost:        
Land 0 [1] 0 [2]    
Buildings and improvements 0 [1] 0 [2]    
Furniture and equipment 0 [1] 0 [2]    
Property subject to or available for operating lease, gross 0 [1]      
Property, plant and equipment (gross) 0 [1] 0 [2]    
Less: Accumulated depreciation 0 [1] 0 [2]    
Total property, plant and equipment 0 [1] 0 [2]    
Total assets 416,942 [1] 435,855 [2]    
Liabilities:        
Accounts payable and accrued expenses 0 [1] 0 [2]    
Notes, loans and leases payable 0 [1] 0 [2]    
Policy benefits and losses, claims and loss expenses payable 295,216 [1] 330,184 [2]    
Liabilities from investment contracts 0 [1] 0 [2]    
Other policyholders' funds and liabilities 3,732 [1] 3,157 [2]    
Deferred income 0 [1] 0 [2]    
Deferred income taxes 30,440 [1] (36,241) [2]    
Related party liabilities 1,647 [1] 1,844 [2]    
Total liabilities 270,155 [1] 298,944 [2]    
Stockholders' equity:        
Additional paid-in capital 91,120 [1] 91,120 [2]    
Accumulated other comprehensive loss 1,782 [1] 4,568 [2]    
Retained earnings 50,584 [1] 37,922 [2]    
Unearned employee stock ownership plan shares 0 [1] 0 [2]    
Total stockholders' equity 146,787 [1] 136,911 [2]    
Total liabilities and stockholders' equity 416,942 [1] 435,855 [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   0 [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 0 [1] 0 [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] | Uhaul 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 0 [1] 0 [2]    
Operating Segments [Member] | Property and Casualty Insurance [Member] | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 [1] 0 [2]    
Operating Segments [Member] | Life Insurance [Member]
        
ASSETS:        
Cash and cash equivalents 17,644 [1] 22,064 [2] 25,410 [3] 37,301 [4]
Reinsurance recoverables and trade receivables, net 28,026 [1] 32,520 [2]    
Inventories, net 0 [1] 0 [2]    
Prepaid expenses 0 [1] 0 [2]    
Investments, fixed maturities and marketable equities 946,102 [1] 913,655 [2]    
Investments, other 161,326 [1] 125,900 [2]    
Deferred policy acquisition costs, net 118,707 [1] 93,043 [2]    
Other assets 1,740 [1] 157 [2]    
Related party assets 515 [1] 514 [2]    
Subtotal assets 1,274,060 [1] 1,187,853 [2]    
Investments in subsidiaries 0 [1] 0 [2]    
Property, plant and equipment, at cost:        
Land 0 [1] 0 [2]    
Buildings and improvements 0 [1] 0 [2]    
Furniture and equipment 0 [1] 0 [2]    
Property, plant and equipment (gross) 0 [1] 0 [2]    
Less: Accumulated depreciation 0 [1] 0 [2]    
Total property, plant and equipment 0 [1] 0 [2]    
Total assets 1,274,060 [1] 1,187,853 [2]    
Liabilities:        
Accounts payable and accrued expenses 1,743 [1] 8,139 [2]    
Notes, loans and leases payable 0 [1] 0 [2]    
Policy benefits and losses, claims and loss expenses payable 416,714 [1] 404,040 [2]    
Liabilities from investment contracts 616,725 [1] 510,789 [2]    
Other policyholders' funds and liabilities 4,256 [1] 4,137 [2]    
Deferred income 0 [1] 0 [2]    
Deferred income taxes 7,741 [1] 17,810 [2]    
Related party liabilities 178 [1] 208 [2]    
Total liabilities 1,047,357 [1] 945,123 [2]    
Stockholders' equity:        
Additional paid-in capital 26,271 [1] 26,271 [2]    
Accumulated other comprehensive loss 4,210 [1] 37,567 [2]    
Retained earnings 193,722 [1] 176,392 [2]    
Unearned employee stock ownership plan shares 0 [1] 0 [2]    
Total stockholders' equity 226,703 [1] 242,730 [2]    
Total liabilities and stockholders' equity 1,274,060 [1] 1,187,853 [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 0 [1] 0 [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 0 [1] 0 [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] | Uhaul 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 0 [1] 0 [2]    
Operating Segments [Member] | Life Insurance [Member] | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 [1] 0 [2]    
Operating Segments [Member] | Moving and Storage Consolidations [Member]
        
ASSETS:        
Cash and cash equivalents 464,710 427,560 309,228 323,495
Reinsurance recoverables and trade receivables, net 28,961 43,259    
Inventories, net 67,020 56,396    
Prepaid expenses 55,269 57,451    
Investments, fixed maturities and marketable equities 0 21,228    
Investments, other 32,850 50,653    
Deferred policy acquisition costs, net 0 0    
Other assets 93,857 98,617    
Related party assets 172,507 184,201    
Subtotal assets 915,174 939,365    
Investments in subsidiaries 373,490 379,641    
Property, plant and equipment, at cost:        
Land 405,177 333,228    
Buildings and improvements 1,430,330 1,197,875    
Furniture and equipment 322,088 311,142    
Property, plant and equipment (gross) 5,141,717 4,314,409    
Less: Accumulated depreciation (1,732,506) (1,559,355)    
Total property, plant and equipment 3,409,211 2,755,054    
Total assets 4,697,875 4,074,599    
Liabilities:        
Accounts payable and accrued expenses 356,211 350,352    
Notes, loans and leases payable 1,942,359 1,661,845    
Policy benefits and losses, claims and loss expenses payable 370,668 380,824    
Liabilities from investment contracts 0 0    
Other policyholders' funds and liabilities 0 0    
Deferred income 31,390 30,217    
Deferred income taxes 455,295 412,089    
Related party liabilities 14,584 10,013    
Total liabilities 3,170,507 2,845,340    
Stockholders' equity:        
Additional paid-in capital 444,420 438,378    
Accumulated other comprehensive loss (53,923) (22,680)    
Retained earnings 1,805,243 1,482,420    
Unearned employee stock ownership plan shares (1,219) (1,706)    
Total stockholders' equity 1,527,368 1,229,259    
Total liabilities and stockholders' equity 4,697,875 4,074,599    
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 373,325 317,476    
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 2,610,797 2,154,688    
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] | Uhaul 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] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member]
        
ASSETS:        
Cash and cash equivalents 0 0 0 0
Reinsurance recoverables and trade receivables, net 0 0    
Inventories, net 0 0    
Prepaid expenses 0 0    
Investments, fixed maturities and marketable equities 0 0    
Investments, other 0 0    
Deferred policy acquisition costs, net 0 0    
Other assets 0 0    
Related party assets (1,093,830) [5] (975,683)    
Subtotal assets (1,093,830) (975,683)    
Investments in subsidiaries (120,122) [6] 140,100 [6]    
Property, plant and equipment, at cost:        
Land 0 0    
Buildings and improvements 0 0    
Furniture and equipment 0 0    
Property, plant and equipment (gross) 0 0    
Less: Accumulated depreciation 0 0    
Total property, plant and equipment 0 0    
Total assets (1,213,952) (835,583)    
Liabilities:        
Accounts payable and accrued expenses 0 0    
Notes, loans and leases payable 0 0    
Policy benefits and losses, claims and loss expenses payable 0 0    
Liabilities from investment contracts 0 0    
Other policyholders' funds and liabilities 0 0    
Deferred income 0 0    
Deferred income taxes 0 0    
Related party liabilities (1,093,830) [5] (975,683) [5]    
Total liabilities (1,093,830) (975,683)    
Stockholders' equity:        
Additional paid-in capital (269,171) [6] (269,171) [6]    
Accumulated other comprehensive loss 59,914 [6] 62,325 [6]    
Retained earnings 89,137 [6] 346,948 [6]    
Unearned employee stock ownership plan shares 0 0    
Total stockholders' equity (120,122) 140,100    
Total liabilities and stockholders' equity (1,213,952) (835,583)    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Rental Trailers and Other Rental Equipment [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Rental Trucks [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Series A Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Series B Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Series A Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued (2) [6] (2) [6]    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Intersubsegment Eliminations [Member] | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member]
        
ASSETS:        
Cash and cash equivalents 321,544 327,119 201,502 250,104
Reinsurance recoverables and trade receivables, net 0 0    
Inventories, net 0 0    
Prepaid expenses 18,537 22,475    
Investments, fixed maturities and marketable equities 0 21,228    
Investments, other 0 0    
Deferred policy acquisition costs, net 0 0    
Other assets 159 118    
Related party assets 1,150,671 1,032,663    
Subtotal assets 1,490,911 1,403,603    
Investments in subsidiaries 493,612 239,541    
Property, plant and equipment, at cost:        
Land 0 0    
Buildings and improvements 0 0    
Furniture and equipment 72 136    
Property, plant and equipment (gross) 72 136    
Less: Accumulated depreciation (56) (116)    
Total property, plant and equipment 16 20    
Total assets 1,984,539 1,643,164    
Liabilities:        
Accounts payable and accrued expenses 657 110    
Notes, loans and leases payable 0 0    
Policy benefits and losses, claims and loss expenses payable 0 0    
Liabilities from investment contracts 0 0    
Other policyholders' funds and liabilities 0 0    
Deferred income 0 0    
Deferred income taxes 455,295 412,089    
Related party liabilities 0 0    
Total liabilities 455,295 412,199    
Stockholders' equity:        
Additional paid-in capital 444,420 438,378    
Accumulated other comprehensive loss (53,923) (22,680)    
Retained earnings 1,805,243 1,482,420    
Unearned employee stock ownership plan shares 0 0    
Total stockholders' equity 1,528,587 1,230,965    
Total liabilities and stockholders' equity 1,984,539 1,643,164    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Rental Trailers and Other Rental Equipment [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Rental Trucks [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Series A Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Series B Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Series A Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued 10,497 10,497    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value (525,653) (525,653)    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | AMERCO [Member] | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value (151,997) (151,997)    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member]
        
ASSETS:        
Cash and cash equivalents 140,844 98,926 106,951 72,634
Reinsurance recoverables and trade receivables, net 28,784 43,259    
Inventories, net 67,020 56,396    
Prepaid expenses 36,236 34,956    
Investments, fixed maturities and marketable equities 0 0    
Investments, other 1,653 100    
Deferred policy acquisition costs, net 0 0    
Other assets 59,746 69,671    
Related party assets 115,657 127,751    
Subtotal assets 449,940 431,059    
Investments in subsidiaries 0       
Property, plant and equipment, at cost:        
Land 56,242 81,421    
Buildings and improvements 205,762 184,053    
Furniture and equipment 311,053 292,621    
Property, plant and equipment (gross) 3,557,179 3,030,259    
Less: Accumulated depreciation (1,349,920) (1,185,796)    
Total property, plant and equipment 2,207,259 1,844,463    
Total assets 2,657,199 2,275,522    
Liabilities:        
Accounts payable and accrued expenses 351,050 345,864    
Notes, loans and leases payable 1,060,240 881,766    
Policy benefits and losses, claims and loss expenses payable 370,668 380,824    
Liabilities from investment contracts 0 0    
Other policyholders' funds and liabilities 0 0    
Deferred income 31,390 30,217    
Deferred income taxes 0 0    
Related party liabilities 588,919 638,448    
Total liabilities 2,402,267 2,277,119    
Stockholders' equity:        
Additional paid-in capital 121,230 121,230    
Accumulated other comprehensive loss (59,914) (62,325)    
Retained earnings 194,834 (58,797)    
Unearned employee stock ownership plan shares (1,219) (1,706)    
Total stockholders' equity 254,932 (1,597)    
Total liabilities and stockholders' equity 2,657,199 2,275,522    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Rental Trailers and Other Rental Equipment [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 373,325 317,476    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Rental Trucks [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 2,610,797 2,154,688    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Series A Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Series B Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Series A Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued 1 1    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Uhaul [Member] | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member]
        
ASSETS:        
Cash and cash equivalents 2,322 1,515 775 757
Reinsurance recoverables and trade receivables, net 177 0    
Inventories, net 0 0    
Prepaid expenses 496 20    
Investments, fixed maturities and marketable equities 0 0    
Investments, other 31,197 50,553    
Deferred policy acquisition costs, net 0 0    
Other assets 33,952 28,828    
Related party assets 9 9    
Subtotal assets 68,153 80,925    
Investments in subsidiaries 0 0    
Property, plant and equipment, at cost:        
Land 348,935 251,807    
Buildings and improvements 1,224,568 1,013,822    
Furniture and equipment 10,963 18,385    
Property, plant and equipment (gross) 1,584,466 1,284,014    
Less: Accumulated depreciation (382,530) (373,443)    
Total property, plant and equipment 1,201,936 910,571    
Total assets 1,270,089 991,496    
Liabilities:        
Accounts payable and accrued expenses 4,504 4,378    
Notes, loans and leases payable 882,119 780,079    
Policy benefits and losses, claims and loss expenses payable 0 0    
Liabilities from investment contracts 0 0    
Other policyholders' funds and liabilities 0 0    
Deferred income 0 0    
Deferred income taxes 0 0    
Related party liabilities 519,495 347,248    
Total liabilities 1,406,118 1,131,705    
Stockholders' equity:        
Additional paid-in capital 147,941 147,941    
Accumulated other comprehensive loss 0 0    
Retained earnings (283,971) (288,151)    
Unearned employee stock ownership plan shares 0 0    
Total stockholders' equity (136,029) (140,209)    
Total liabilities and stockholders' equity 1,270,089 991,496    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Rental Trailers and Other Rental Equipment [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Rental Trucks [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Series A Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Series B Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Series A Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued          
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued 1 1    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Operating Segments [Member] | Moving and Storage Consolidations [Member] | Real Estate [Member] | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Eliminations
        
ASSETS:        
Cash and cash equivalents 0 0 0 0
Reinsurance recoverables and trade receivables, net 0 0    
Inventories, net 0 0    
Prepaid expenses 0 0    
Investments, fixed maturities and marketable equities 0 0    
Investments, other 0 0    
Deferred policy acquisition costs, net 0 0    
Other assets 0 0    
Related party assets (16,409) [5] (12,065)    
Subtotal assets (16,409) (12,065)    
Investments in subsidiaries (373,490) [6] (379,641) [6]    
Property, plant and equipment, at cost:        
Land 0 0    
Buildings and improvements 0 0    
Furniture and equipment 0 0    
Property, plant and equipment (gross) 0 0    
Less: Accumulated depreciation 0 0    
Total property, plant and equipment 0 0    
Total assets (389,899) (391,706)    
Liabilities:        
Accounts payable and accrued expenses 0 0    
Notes, loans and leases payable 0 0    
Policy benefits and losses, claims and loss expenses payable 0 0    
Liabilities from investment contracts 0 0    
Other policyholders' funds and liabilities 0 0    
Deferred income 0 0    
Deferred income taxes 0 0    
Related party liabilities (16,409) [5] (12,065) [5]    
Total liabilities (16,409) (12,065)    
Stockholders' equity:        
Additional paid-in capital (117,601) [6] (117,601) [6]    
Accumulated other comprehensive loss (5,992) [6] (42,135) [6]    
Retained earnings (244,096) [6] (214,104) [6]    
Unearned employee stock ownership plan shares 0 0    
Total stockholders' equity (373,490) (379,641)    
Total liabilities and stockholders' equity (389,899) (391,706)    
Eliminations | Rental Trailers and Other Rental Equipment [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Eliminations | Rental Trucks [Member]
        
Property, plant and equipment, at cost:        
Property subject to or available for operating lease, gross 0 0    
Eliminations | Series A Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Eliminations | Series B Preferred Stock [Member]
        
Stockholders' equity:        
Preferred stock, value, issued          
Eliminations | Series A Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued          
Eliminations | Uhaul Common Stock [Member]
        
Stockholders' equity:        
Common stock, value, issued (5,801) [6] (5,801) [6]    
Eliminations | Common Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value 0 0    
Eliminations | Preferred Stock in Treasury [Member]
        
Stockholders' equity:        
Treasury stock, value $ 0 $ 0    
[1] Balances as of December 31, 2013
[2] Balances as of December 31, 2012
[3] Balance for the period ended December 31, 2012
[4] Balances for the year ended December 31, 2011
[5] Eliminate intercompany receivables and payables
[6] Eliminate investment in subsidiaries