Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Policy Acquisition Costs [Roll Forward]
DPAC, beginning of year	$ 103,654	$ 108,822	$ 110,614
Capitalized Costs	217,286	212,067	222,329
Amortization of DPAC	(210,955)	(217,235)	(224,121)
DPAC, end of year	$ 109,985	$ 103,654	$ 108,822

Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration