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Segment reporting - Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Expenditures for property and equipment	$ 264,349	$ 245,740
Segment, Expenditure, Addition to Long-Lived Assets	264,349	245,740
U. S. Dialysis And Related Lab Services
Segment Reporting Information [Line Items]
Segment, Expenditure, Addition to Long-Lived Assets	216,902	211,171
Other Operating Segment
Segment Reporting Information [Line Items]
Segment, Expenditure, Addition to Long-Lived Assets	$ 47,447	$ 34,569

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

Amount of expenditure for addition to long-lived assets included in determination of segment assets by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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