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Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Beginning balance $ 7,046,241 $ 6,919,109
Acquisitions   173,244
Acquisitions (1,145)  
Divestitures (3,213) (1,745)
Foreign currency and other adjustments (22,105) (44,367)
Ending balance 7,019,778 7,046,241
Goodwill, before accumulated impairment charges 7,136,340  
Accumulated impairment charges (116,562)  
Ending balance 7,019,778 7,046,241
U.S. dialysis    
Goodwill [Roll Forward]    
Beginning balance 6,400,162 6,309,928
Acquisitions   91,979
Acquisitions 0  
Divestitures (87) (1,745)
Foreign currency and other adjustments 0 0
Ending balance 6,400,075 6,400,162
Goodwill, before accumulated impairment charges 6,400,075  
Accumulated impairment charges 0  
Ending balance 6,400,075 6,400,162
Other—Ancillary services    
Goodwill [Roll Forward]    
Beginning balance 646,079 609,181
Acquisitions   81,265
Acquisitions (1,145)  
Divestitures (3,126) 0
Foreign currency and other adjustments (22,105) (44,367)
Ending balance 619,703 646,079
Goodwill, before accumulated impairment charges 736,265  
Accumulated impairment charges (116,562)  
Ending balance $ 619,703 $ 646,079