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Accumulated other comprehensive loss - Components of Changes in Accumulated Other Comprehensive Loss (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance $ 598,730
Ending Balance 570,315
Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (1,065)
Other comprehensive income (loss) (1,038)
Ending Balance (2,103)
Neo Medical [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (228)
Other comprehensive income (loss) 1,671
Ending Balance 1,443
Accumulated Other Comprehensive Loss [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance (1,293)
Other comprehensive income (loss) 633
Ending Balance (660)
Other Investments [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balance $ 0