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Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Expenditures for property and equipment $ 184,405 $ 185,440 $ 398,940 $ 358,627
U.S. dialysis and related lab services        
Segment Reporting Information [Line Items]        
Expenditures for property and equipment 152,233 150,932 325,761 284,380
DMG        
Segment Reporting Information [Line Items]        
Expenditures for property and equipment 20,883 18,098 48,671 38,243
Ancillary services and strategic initiatives        
Segment Reporting Information [Line Items]        
Expenditures for property and equipment $ 11,289 $ 16,410 $ 24,508 $ 36,004