Schedule II - Condensed Financial Information of the Registrant Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Statements of Income and Comprehensive Income
Revenues	$ 884,911	$ 846,248	$ 877,753
Expenses	720,641	671,478	754,072
Net income	130,710	138,211	99,601
Other comprehensive (loss) income, net of tax	(28,948)	25,337	38,896
Comprehensive income	101,762	163,548	138,497
Registrant
Condensed Statements of Income and Comprehensive Income
Expenses	1,755	1,833	1,694
Net loss	(1,755)	(1,833)	(1,694)
Earnings from consolidated subsidiaries	132,465	140,044	101,295
Net income	130,710	138,211	99,601
Other comprehensive (loss) income, net of tax	(28,948)	25,337	38,896
Comprehensive income	$ 101,762	$ 163,548	$ 138,497