Schedule V - AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) - Amerco [Member] - Property Casualty Insurance Operations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental information for property, casualty insurance underwriters:
Deferred policy acquisition costs
Reserves for unpaid claims and claims adjustment expense	$ 251,964	$ 271,609	$ 295,126
Discount if any, deducted
Unearned premiums	$ 59	$ 45	$ 49
Net earned premiums (1)	50,020	46,456	41,052
Net investment income (2)	13,491	11,980	10,057
Claim and claim adjustment expenses incurred related to current year	12,214	11,690	9,861
Claim and claim adjustment expenses incurred related to prior year	$ 84	$ (694)	$ 1,652
Amortization of deferred policy acquisition costs
Paid claims and claim adjustment expense	$ 18,360	$ 18,872	$ 6,576
Net premiums written (1)	$ 50,034	$ 46,452	$ 41,065