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Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Insurance [Abstract]
Direct business	$ 573,412	$ 584,467	$ 554,617
Reinsurance assumed	154,191	97,655	51,986
Reinsurance ceded	(136,272)	(102,054)	(58,436)
Net written premiums	591,331	580,068	548,167
Direct business	589,131	578,171	560,658
Reinsurance assumed	135,896	78,880	69,312
Reinsurance ceded	(122,556)	(61,441)	(62,271)
Net earned premiums	$ 602,471	$ 595,610	$ 567,699

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