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Segment reporting - Summary of Assets by Segment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
ASSETS    
Total assets $ 17,647,268 $ 16,988,516
U.S. dialysis    
ASSETS    
Total assets 16,036,940 15,344,647
Other—Ancillary services    
ASSETS    
Total assets $ 1,610,328 $ 1,643,869