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Accumulated other comprehensive loss - Components of Changes in Accumulated Other Comprehensive Loss (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance $ 336,860
Ending Balance 615,483
Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (2,482)
Other comprehensive income (loss) (492)
Ending Balance (2,974)
Neo Medical [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance 1,005
Other comprehensive income (loss) 109
Ending Balance 1,114
Accumulated Other Comprehensive Loss [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (1,376)
Other comprehensive income (loss) (484)
Ending Balance (1,860)
Other Investments [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance 101
Other comprehensive income (loss) $ (101)