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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 30, 2021 | Sep. 30, 2021 | Sep. 29, 2021 | Dec. 31, 2020 | Jul. 01, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | $ 1,819,738,000 |  |  |  | $ 1,713,274,000 |
Maximum borrowing capacity | 900,000,000.0 |  |  |  |  |
Letters of credit, outstanding amount | $ 19,700,000 |  |  |  | 35,600,000 |
Fund IV | SOFR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Basis Spread On Variable Rate1 | 2.01% |  |  |  |  |
Fund Portfolio | Fund II |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | $ 255,978,000 |  |  |  | 228,282,000 |
Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 700,000,000.0 |  |  |  |  |
Unsecured Debt | Fund IV | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  | 3,600,000 |
Unsecured Debt | Core Portfolio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | $ 400,000,000 |  |  |  | 380,000,000 |
Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan |  |  | $ 0 |  | 30,000,000.0 | $ 30,000,000.0
Debt instrument, maturity date | Jun. 30, 2021 |  |  |  |  |
LIBOR plus |  |  |  |  |  | 2.55%
LIBOR floor |  |  |  |  |  | 0.75%
Term Loan | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt available balance |  |  |  |  |  | $ 90,000,000.0
Secured Debt | Fund II |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR plus | 2.25% |  |  | 1.65% |  |
Maturity Date | 2022-09 |  |  |  |  |
Unsecured Notes Payable | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt available balance | $ 16,300,000 |  |  |  | 128,700,000 |
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | $ 40,000,000 |  |  |  | 40,000,000 |
$400 Million Term Loan | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Basis Spread On Variable Rate1 | 1.55% |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000.0 |  |  |  |  |
$400 Million Term Loan | Unsecured Debt | Core Portfolio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | 400,000,000.0 |  |  |  |  |
Three Hundred And Fifty Millions Term Loan | Unsecured Debt | Core Portfolio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding |  |  |  |  | 350,000,000.0 |
Term Loan Maturing In September 2020 | Secured Debt | Fund II |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 40,000,000.0 |  |  |  |  |
Long-term line of credit, noncurrent | 40,000,000.0 |  |  |  | 40,000,000.0 |
Remaining borrowing capacity | 0 |  |  |  | 0 |
Subscription Line | Unsecured Debt | Fund IV |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 5,000,000.0 |  |  |  |  |
Long-term line of credit, noncurrent | $ 5,000,000.0 |  |  |  | 900,000 |
Remaining borrowing capacity |  |  |  |  | 500,000 |
Subscription Line | Unsecured Debt | Fund V |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR plus | 1.90% | 1.60% |  |  |  |
Maximum borrowing capacity | $ 150,000,000.0 |  |  |  |  |
Maturity Date | 2022-05 |  |  |  |  |
Subscription Line | Unsecured Debt | Fund V | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letters of credit, outstanding amount | $ 15,700,000 |  |  |  | 21,500,000 |
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | 118,028,000 |  |  |  | 250,000 |
Remaining borrowing capacity | $ 16,300,000 |  |  |  | $ 128,200,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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