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Deferred Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
Deferred Costs (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Deferred Costs [Roll Forward]
Balance, beginning of period	$ 70,179	$ 59,720
Incurred deferred costs	18,234	17,781
Amortized deferred costs	(16,604)	(14,891)
Balance, end of period	$ 71,809	$ 62,610