| Document and Entity Information | Mar. 31, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | CAPITAL SENIOR LIVING CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0001043000 |
| Document Type | 8-K |
| Document Period End Date | Mar. 31, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-13445 |
| Entity Tax Identification Number | 75-2678809 |
| Entity Address, Address Line One | 14160 Dallas Parkway |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75254 |
| City Area Code | (972) |
| Local Phone Number | 770-5600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | CSU |
| Security Exchange Name | NYSE |
