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Commitments and Contingencies - Additional Information (Detail) $ in Thousands		1 Months Ended	9 Months Ended
	Aug. 15, 2017 legal_matter	Dec. 31, 2017 USD ($)	Sep. 30, 2021 USD ($)
Commitments and Contingencies:
Corporate Integrity Agreement Period			5 years
Corporate Integrity Agreement Expiration Date			Oct. 22, 2019
Commitments to provide operating capital
Commitments and Contingencies:
Other potential commitments to provide operating capital to several dialysis centers			$ 11,100
US Attorney Prescription Drug Investigation
Commitments and Contingencies:
Litigation Settlement, Amount Awarded to Other Party		$ 63,700
Stockholder Derivative Litigation
Commitments and Contingencies:
Loss Contingency Number of Previously Disclosed Lawsuits Consolidated Into One | legal_matter	3
Incremental Cash Portion | US Attorney Prescription Drug Investigation
Commitments and Contingencies:
Litigation Settlement, Amount Awarded to Other Party		41,500
Cash Paid For Portion Previously Refunded | US Attorney Prescription Drug Investigation
Commitments and Contingencies:
Litigation Settlement, Amount Awarded to Other Party		$ 22,200

X

- Definition

Corporate Integrity Agreement Expiration Date, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Definition

Corporate Integrity Agreement Period, in PnYnMnDn format.

+ References

No definition available.

+ Details

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X

- Definition

Loss Contingency Number of Lawsuits Consolidated Into One.

+ References

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X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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X

- 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.

+ Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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