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Leases - Narrative (Details)	Sep. 30, 2020 seniorHousingCommunity
Leases [Abstract]
Number of leased senior housing communities	39

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- Definition

Number of leased senior housing communities.

+ References

No definition available.

+ Details

Name:	csu_NumberOfLeasedSeniorHousingCommunities
Namespace Prefix:	csu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration