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Segment reporting (Tables)
9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Summary of Segment Net Revenues, Segment Operating Income (Loss) and Reconciliation of Segment Income to Consolidated Income Before Income Taxes
The following is a summary of segment revenues, segment operating margin (loss), and a reconciliation of segment operating margin to consolidated income before income taxes:
Three months ended September 30,Nine months ended September 30,
 2024202320242023
Segment revenues:  
U.S. dialysis  
Dialysis patient service revenues:  
External sources$2,883,656 $2,754,778 $8,431,418 $8,042,561 
Intersegment revenues16,140 24,289 53,528 66,698 
U.S. dialysis patient service revenues2,899,796 2,779,067 8,484,946 8,109,259 
Other revenues:
External sources6,204 6,239 18,224 18,822 
Total U.S. dialysis revenues2,906,000 2,785,306 8,503,170 8,128,081 
Other—Ancillary services
Dialysis patient service revenues254,905 197,172 709,777 560,108 
Other external sources118,825 163,143 361,448 372,909 
Intersegment revenues2,598 2,232 9,168 5,007 
Total ancillary services revenues376,328 362,547 1,080,393 938,024 
Total net segment revenues3,282,328 3,147,853 9,583,563 9,066,105 
Elimination of intersegment revenues(18,738)(26,521)(62,696)(71,705)
Consolidated revenues$3,263,590 $3,121,332 $9,520,867 $8,994,400 
Segment operating margin (loss):  
U.S. dialysis$549,476 $509,135 $1,625,399 $1,330,992 
Other—Ancillary services13,906 28,098 (16,188)(18,372)
Total segment operating margin563,382 537,233 1,609,211 1,312,620 
Reconciliation of segment operating income to consolidated
 income before income taxes:
  
Corporate administrative support(28,504)(41,294)(84,090)(99,745)
Consolidated operating income534,878 495,939 1,525,121 1,212,875 
Debt expense(134,583)(98,080)(331,748)(302,361)
Debt prepayment, extinguishment and modification costs(10,081)— (19,813)(7,962)
Other loss, net(16,780)(19,650)(56,900)(14,525)
Consolidated income before income taxes$373,434 $378,209 $1,116,660 $888,027 
Summary of Depreciation and Amortization Expense by Reportable Segment
Depreciation and amortization expense by reportable segment was as follows:
Three months ended September 30,Nine months ended September 30,
 2024202320242023
U.S. dialysis$170,543 $175,908 $503,805 $514,710 
Other—Ancillary services16,471 12,515 45,953 35,456 
 $187,014 $188,423 $549,758 $550,166 
Summary of Expenditures for Property and Equipment by Reportable Segment
Expenditures for property and equipment by reportable segment were as follows:
Nine months ended September 30,
 20242023
U.S. dialysis$331,031 $363,895 
Other—Ancillary services53,755 45,116 
 $384,786 $409,011