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Debt - Credit Facilities (Details) | Dec. 11, 2020 USD ($) | Sep. 09, 2020 USD ($) community | Aug. 31, 2020 USD ($) community | Mar. 31, 2020 USD ($) community | Mar. 20, 2020 USD ($) community | Mar. 19, 2020 USD ($) community | Jan. 31, 2020 USD ($) community | Aug. 29, 2019 USD ($) community | May 07, 2019 USD ($) community | Dec. 31, 2020 USD ($) | Dec. 05, 2018 USD ($)
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First Mortgage Financing |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 156,500,000 | $ 191,300,000 | $ 73,100,000 |  |  |  |  |  |  |
First Mortgage Financing | LIBOR |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate basis |  | 2.54% | 2.49% | 2.10% | 2.50% | 2.25% | 2.09% | 2.17% | 2.23% |  |
Fifth Amended and Restated Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  | $ 166,400,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Letters of credit outstanding |  |  |  |  |  |  |  |  |  | $ 0 |
Current borrowing capacity |  |  |  |  |  |  |  |  |  | 22,200,000 |
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate basis |  |  | 2.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement | Line of Credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate basis |  |  | 2.25% |  |  |  |  |  |  |  |
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate basis |  |  | 3.25% |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement with Capital One, National Association | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 80,000,000 |  |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.25% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement with Capital One, National Association | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate basis | 2.75% |  |  |  |  |  |  |  |  |  |
Letter of credit sublimit | Fifth Amended and Restated Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 60,000,000.0
Letters of credit outstanding |  |  |  |  |  |  |  |  |  | 40,400,000 |
Current borrowing capacity |  |  |  |  |  |  |  |  |  | 22,200,000 |
Swingline Line of Credit | Fifth Amended and Restated Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0
Letters of credit collateral | Fifth Amended and Restated Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 51,600,000 |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  | $ 40,300,000 |
Non-Recourse First Mortgages | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities securing debt | community |  | 27 | 16 | 18 | 1 | 7 | 14 | 5 | 14 |  |
Non-Recourse Supplemental Loan | First Mortgage Financing |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 220,500,000 | $ 266,900,000 | $ 149,300,000 | $ 30,000,000.0 | $ 29,200,000 | $ 238,200,000 | $ 160,300,000 | $ 111,100,000 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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