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Income taxes - Schedule of income tax expense (benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Income tax expense	$ 111,832	$ 113,681	$ 92,201
Other comprehensive income:
Cash flow hedges	(4,947)	5,265	(3,327)
Retirement benefits	690	3,859	(894)
Retained earnings:
Deferred tax benefit recognized on adoption of ASU 2016-13	(29,151)	(9,263)	(22,587)
ASC 326
Retained earnings:
Deferred tax benefit recognized on adoption of ASU 2016-13	$ 0	$ 0	$ (935)

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Income Tax Disclosure [Line Items]

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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