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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Policy Acquisition Costs [Roll Forward]
DPAC, beginning of year	$ 91,882	$ 84,686	$ 73,059
Capitalized Costs	217,886	184,039	174,814
Amortization of DPAC	(199,154)	(176,843)	(163,187)
DPAC, end of year	$ 110,614	$ 91,882	$ 84,686

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- Definition

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

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