v3.26.1
Goodwill - Changes in Goodwill by Reportable Segments (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Goodwill [Roll Forward]      
Beginning balance $ 7,545,095 $ 7,375,216 $ 7,545,095
Acquisitions   71,684 34,608
Foreign currency and other adjustments 98,195   11,263
Ending balance     7,590,966
Goodwill, before accumulated impairment charges     7,744,369
Accumulated impairment charges     (153,403)
Ending balance     7,590,966
U. S. Dialysis      
Goodwill [Roll Forward]      
Beginning balance 6,527,616 6,517,220 6,527,616
Acquisitions 10,396   21,928
Foreign currency and other adjustments 0   0
Ending balance     6,549,544
Goodwill, before accumulated impairment charges     6,549,544
Accumulated impairment charges     0
Ending balance     6,549,544
Other - Ancillary Services      
Goodwill [Roll Forward]      
Beginning balance 1,017,479 $ 857,996 1,017,479
Acquisitions 61,288   12,680
Foreign currency and other adjustments $ 98,195   11,263
Ending balance     1,041,422
Goodwill, before accumulated impairment charges     1,194,825
Accumulated impairment charges     (153,403)
Ending balance     $ 1,041,422
Other Reporting Units      
Goodwill [Roll Forward]      
Number of operating segments that were considered at risk of significant goodwill impairment | segment     0