v3.26.3
Goodwill - Changes in Goodwill by Reportable Segments (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Goodwill [Roll Forward]    
Beginning balance $ 7,545,095 $ 7,375,216
Acquisitions 50,009 71,684
Impairment charges (57,104)  
Foreign currency and other adjustments 10,042 98,195
Ending balance 7,548,042 7,545,095
Goodwill, before accumulated impairment charges 7,757,997  
Accumulated impairment charges (209,955)  
Ending balance 7,548,042 7,545,095
U. S. Dialysis    
Goodwill [Roll Forward]    
Beginning balance 6,527,616 6,517,220
Acquisitions 25,903 10,396
Impairment charges 0  
Foreign currency and other adjustments 0 0
Ending balance 6,553,519 6,527,616
Goodwill, before accumulated impairment charges 6,553,519  
Accumulated impairment charges 0  
Ending balance 6,553,519 6,527,616
Other - Ancillary Services    
Goodwill [Roll Forward]    
Beginning balance 1,017,479 857,996
Acquisitions 24,106 61,288
Impairment charges (57,104)  
Foreign currency and other adjustments 10,042 98,195
Ending balance 994,523 1,017,479
Goodwill, before accumulated impairment charges 1,204,478  
Accumulated impairment charges (209,955)  
Ending balance $ 994,523 $ 1,017,479