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Segment reporting - Summary of Depreciation and Amortization Expense by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | $ 183,672 | $ 171,176 | $ 361,743 | $ 344,120
U.S. dialysis |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 171,842 | 160,612 | 338,803 | 322,632
Other—Ancillary services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | $ 11,830 | $ 10,564 | $ 22,940 | $ 21,488

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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