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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Deferred Policy Acquisition Costs [Roll Forward]
DPAC, beginning of period	$ 115,971	$ 103,527	$ 110,614	$ 91,882
Capitalized Costs	55,054	58,727	170,996	164,700
Amortization of DPAC	(57,046)	(50,959)	(167,631)	(145,287)
DPAC, end of period	$ 113,979	$ 111,295	$ 113,979	$ 111,295

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

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