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Income taxes - Schedule of income tax expense (benefit) computed by applying the U.S. federal statutory income tax rate to income before income taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income before income tax expense	$ 465,236	$ 483,129	$ 400,477
Statutory tax rates	21.00%	21.00%	21.00%
Computed expected income tax expense	$ 97,700	$ 101,457	$ 84,100
Increase (decrease) in income taxes resulting from:
Foreign tax rate differential	13,853	10,747	15,456
Tax benefit from tax holiday	(797)	(3,159)	(16,063)
True-up of prior years tax liability	2,096	7,590	(3,420)
Interest income on income tax refund	(2,168)	(7,780)	0
Non-deductible expenses	4,826	1,755	372
Effect of change in tax rates	(116)	1,740	453
Change in valuation allowance	10,752	6,244	142,733
Unrecognized tax benefits	1,236	(327)	3,228
Employment related tax incentive	1,093	3,930	0
Internal restructuring	0	0	(129,688)
State income taxes	2,672	5,837	6,995
Excess tax benefit on share-based compensation	(10,418)	(7,773)	(7,310)
Others	(6,711)	1,280	(4,655)
Reported income tax expense (benefit)	111,832	$ 113,681	92,201
Impairment of deferred tax asset	$ 6,881		$ 8,384

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