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Segment reporting - Summary of Segment Net Revenues, Segment Operating Income (Loss) and Reconciliation of Segment Income to Consolidated Income Before Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Other revenues | $ 121,782 | $ 118,889 | $ 249,738 | $ 232,312
Total revenues | 2,879,979 | 2,842,705 | 5,721,216 | 5,585,817
Operating income (loss) | 409,920 | 461,886 | 875,296 | 802,393
Corporate administrative support | (73,088) | (22,021) | (96,672) | (40,866)
Debt expense | (81,381) | (131,666) | (169,984) | (263,185)
Debt prepayment charges | 0 | 12,160 | 2,948 | 12,160
Other income, net | 9,545 | 5,643 | 5,195 | 12,583
Income from continuing operations before income taxes | 338,084 | 323,703 | 707,559 | 539,631
U.S. dialysis |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,639,515 | 2,607,160 | 5,223,897 | 5,123,670
Other—Ancillary services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 240,464 | 235,545 | 497,319 | 462,147
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,919,579 | 2,876,442 | 5,797,210 | 5,653,531
Operating income (loss) | 483,008 | 483,907 | 971,968 | 843,259
Operating Segments | U.S. dialysis |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Dialysis patient service revenues | 2,666,949 | 2,631,993 | 5,278,129 | 5,174,239
Total revenues | 2,674,944 | 2,637,494 | 5,291,567 | 5,184,645
Operating income (loss) | 522,630 | 498,957 | 1,014,236 | 915,939
Operating Segments | U.S. dialysis | External Sources |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Dialysis patient service revenues | 2,631,827 | 2,601,951 | 5,211,067 | 5,113,777
Other revenues | 7,688 | 5,209 | 12,830 | 9,893
Operating Segments | U.S. dialysis | Intersubsegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Dialysis patient service revenues | 35,122 | 30,042 | 67,062 | 60,462
Other revenues | 307 | 292 | 608 | 513
Operating Segments | Other—Ancillary services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Dialysis patient service revenues | 126,370 | 121,865 | 260,411 | 239,728
Other revenues | 114,094 | 113,680 | 236,908 | 222,419
Total revenues | 244,635 | 238,948 | 505,643 | 468,886
Operating income (loss) | (39,622) | (15,050) | (42,268) | (72,680)
Operating Segments | Other—Ancillary services | Intersubsegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Dialysis patient service revenues | 4,171 | 3,403 | 8,324 | 6,739
Intersegment Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (39,600) | (33,737) | (75,994) | (67,714)
Intersegment Elimination | U.S. dialysis |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (35,429) | (30,334) | (67,670) | (60,975)
Intersegment Elimination | Other—Ancillary services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ (4,171) | $ (3,403) | $ (8,324) | $ (6,739)

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