Accumulated other comprehensive loss - Components of Changes in Accumulated Other Comprehensive Loss (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 336,934
Ending Balance	333,539
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(711)
Other comprehensive loss	(4,413)
Ending Balance	(5,124)
Neo Medical [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	711
Other comprehensive loss	(766)
Ending Balance	(55)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss	(5,162)
Ending Balance	(5,162)
Other Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss	17
Ending Balance	$ 17