Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Deferred Policy Acquisition Costs [Roll Forward]
DPAC, beginning of period	$ 109,985	$ 103,654
Capitalized Costs	50,852	45,994
Amortization of DPAC	(54,205)	(51,755)
DPAC, end of period	$ 106,632	$ 97,893

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

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