Consolidating Financial Information by Operating Segment - (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Assets [Abstract]
Total assets	$ 20,330,165	$ 19,058,758	$ 19,002,576
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Assets [Abstract]
Total assets	17,291,214	16,149,748
Operating Segments [Member] | Property and Casualty Insurance [Member]
Assets [Abstract]
Total assets	543,300	501,566
Operating Segments [Member] | Life Insurance [Member]
Assets [Abstract]
Total assets	3,174,307	2,990,903
Intersegment Eliminations [Member]
Assets [Abstract]
Total assets	$ 678,656	$ 583,459