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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($) | Dec. 31, 2019 | Oct. 08, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding | $ 1,717,928,000 |  | $ 1,560,333,000
Maximum borrowing capacity |  | $ 750,000.0 |
Letters of credit, outstanding amount | 19,800,000 |  | 19,700,000
Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount | 562,560,000 |  |
Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding | 24,225,000 |  |
Derivative, notional amount | 42,373,000 |  |
Fund Portfolio | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount | 193,299,000 |  |
Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount | 334,626,000 |  |
Interest Rate Swaps |  |  |
Debt Instrument [Line Items] |  |  |
Derivative, notional amount | $ 156,000,000.0 |  |
Interest Rate Swaps | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Derivative weighted average interest rate | 2.43% |  |
Interest Rate Swaps | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding | $ 70,200,000 |  |
Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | $ 600,000,000.0 |
Unsecured Debt | Fund IV | Letter of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit, outstanding amount | 4,100,000 |  | 7,400,000
Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding | 350,000,000 |  | 350,000,000
Unsecured Notes Payable | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt available balance | 152,500,000 |  | 54,800,000
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding | 40,000,000 |  | 40,000,000
Three Hundred And Fifty Millions Term Loan | Unsecured Debt | Core Portfolio |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding | 350,000,000.0 |  | 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 |  | 0.0
Bridge facility | Unsecured Debt | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 79,200,000 |  | 40,800,000
Long-term line of credit, noncurrent | 79,200,000 |  | 40,800,000
Remaining borrowing capacity | 0.0 |  | 0.0
Subscription Line | Unsecured Debt | Fund IV |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 15,000,000.0 |  | 27,000,000.0
Long-term line of credit, noncurrent | 8,400,000 |  | 0.0
Remaining borrowing capacity | 2,500,000 |  | 7,600,000
Subscription Line | Unsecured Debt | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 150,000,000.0 |  |
Long-term line of credit, noncurrent | 0.0 |  |
Remaining borrowing capacity | $ 150,000,000.0 |  |
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  |  | 102,800,000
Remaining borrowing capacity |  |  | $ 47,200,000

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