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Provision for income taxes - Provision for income taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Expected tax expense, at the U.S. federal statutory income tax rate of 21%	$ 963	$ 1,598	$ 3,339	$ 4,401
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes	$ 134	$ 230	$ 467	$ 631
Other, net	9	24	17	26
Total provision for income taxes	1,106	1,852	3,823	5,058
Comprehensive provision for income taxes allocable to:
Net income	1,106	1,852	3,823	5,058
Other comprehensive income (loss) - marketable securities	(1)	8	(1)	(23)
Total	$ 1,105	$ 1,860	$ 3,822	$ 5,035

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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