Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
Oct. 22, 2019	Mar. 31, 2023
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		$ 10,099

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.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant