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Debt - Mortgage Payable - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 09, 2017 USD ($) | Sep. 30, 2019 USD ($) property | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) property loan | Dec. 31, 2012 USD ($) | Dec. 31, 2018 USD ($) property
Debt Instrument [Line Items] |  |  |  |  |  |
Number of properties collateralized | property |  | 41 |  | 41 |  | 43
Interest Rate Swaps |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | $ 156,000,000.0 |  | $ 156,000,000.0 |  |
Derivative weighted average interest rate |  | 2.43% |  | 2.43% |  |
Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Scheduled principal payment |  |  |  | $ 4,600,000 |  |
Prepayment of line of credit |  |  | $ 49,000,000.0 |  |  |
Mortgages | Interest Rate Swaps |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | $ 91,500,000 |  | $ 91,500,000 |  |
Derivative weighted average interest rate |  | 2.74% |  | 2.74% |  |
Fund Portfolio | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of mortgage loans | loan |  |  |  | 4 |  |
Borrowings, amount |  | $ 118,300,000 |  | $ 118,300,000 |  |
Fund IV | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings, amount |  | 23,800,000 |  | 23,800,000 |  |
Loan amount drew down |  | 18,900,000 |  | 18,900,000 |  |
Repayments of debt |  |  |  | 38,200,000 |  |
Decrease in future availability of mortgage loan |  |  |  | 3,900,000 |  |
Fund IV | Mortgages | BSP I |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Increase (decrease) in mortgage loans |  |  |  | 9,400,000 |  |
Fund IV | Mortgages | 717 North Michigan Avenue |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Increase (decrease) in mortgage loans |  |  |  | 9,900,000 |  |
Fund IV | Mortgages Two |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  |  | 18,400,000 |  |
Fund III | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  |  | 4,700,000 |  |
Increase (decrease) in mortgage loans |  |  |  | 10,000,000.0 |  |
Outstanding mortgage loan amount |  | 39,500,000 |  | 39,500,000 |  |
Fund III | Mortgages One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  |  | 9,800,000 |  |
Fund III | Construction Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount drew down |  | 8,700,000 |  | 8,700,000 |  |
Core Portfolio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | 587,261,000 |  | 587,261,000 |  |
Core Portfolio | Interest Rate Swaps |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | 155,400,000 |  | 155,400,000 |  | $ 0.0
Core Portfolio | Mortgages | Brandywine Portfolio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt default, amount |  | $ 26,300,000 |  | $ 26,300,000 |  | $ 26,300,000
Debt instrument, maturity date |  |  |  | Jul. 01, 2016 |  |
Interest rate, stated percentage |  | 6.00% |  | 6.00% |  |
Debt default interest |  | 5.00% |  | 5.00% |  |
Claim amount exclusive of accruing interest, default interest, fees and costs | $ 33,000,000.0 |  |  |  |  |
Fund II | New Market Tax Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of tax credits on qualifying invested equity loans |  | 39.00% |  |  |  |
Transfer of tax credit transactions to investors exchange amount |  |  |  |  | $ 5,200,000 |
Redemption of loan expiration period |  |  |  | 7 years |  |
Fund II | New Market Tax Credit | Other Income |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Income recognized from tax credit transactions |  | $ 5,000,000.0 |  |  |  |
Fund II | City Point Project | New Market Tax Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Income recognized from tax credit transactions |  | $ 5,000,000.0 |  |  |  |
LIBOR | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.75% |  |
LIBOR | Fund Portfolio | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.65% |  |
LIBOR | Fund IV | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.35% |  |
LIBOR | Fund IV | Mortgages | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.10% |  |
LIBOR | Fund III | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |
LIBOR | Fund III | Mortgages | Variable Rate Debt | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.10% |  |
LIBOR | Fund III | Mortgages | Variable Rate Debt | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 4.65% |  |
LIBOR | Core Portfolio | Variable Rate Debt | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.50% |  |
LIBOR | Core Portfolio | Variable Rate Debt | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.90% |  |

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