Consolidating Financial Information by Operating Segment - (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Assets [Abstract]
Total assets	$ 19,002,576	$ 18,100,734	$ 18,090,124
Operating Segments [Member] | Moving and Storage Consolidations [Member]
Assets [Abstract]
Total assets	16,193,912	15,211,493
Operating Segments [Member] | Property and Casualty Insurance [Member]
Assets [Abstract]
Total assets	480,429	459,897
Operating Segments [Member] | Life Insurance [Member]
Assets [Abstract]
Total assets	2,806,247	2,891,574
Intersegment Eliminations [Member]
Assets [Abstract]
Total assets	$ (478,012)	$ (462,230)