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Debt - Mortgage Payable - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 09, 2017 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) property loan | Dec. 31, 2018 USD ($) property loan derivative | Dec. 31, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Amount drawn on loan |  |  | $ 1,170,076,000 | $ 1,017,288,000 |
Loan amount drew down |  |  | 60,800,000 | 0 |
Interest Rate Swaps |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, notional amount |  |  | 156,000,000.0 |  |
Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings, amount |  |  | 258,900,000 |  |
Scheduled principal payment |  |  | 5,900,000 |  |
Amount drawn on loan |  |  | $ 1,170,076,000 | $ 1,017,288,000 |
Number of properties collateralized | property |  |  | 44 | 43 |
Mortgages | Interest Rate Swaps |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, notional amount |  |  |  | $ 136,600,000 |
Number of interest rate derivatives held | derivative |  |  |  | 4 |
Derivative fixed interest rate |  |  |  | 2.86% |
Mortgages | Maturing from May 2019 to January 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of mortgage loans | loan |  |  | 3 |  |
Borrowings, amount |  |  | $ 69,000,000.0 |  |
Mortgages | Maturing from April 2022 though December 2024. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings, amount |  |  | $ 71,800,000 |  |
Mortgages | Maturities Ranging from November 2019 through January 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of mortgage loans | loan |  |  | 3 |  |
Borrowings, amount |  |  | $ 135,900,000 |  |
Mortgages | Maturing Ranging from December 2020 though May 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings, amount |  |  | 125,300,000 |  |
Mortgages | Interest Rate Swaps |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, notional amount |  |  | $ 283,600,000 |  |
Derivative weighted average interest rate |  |  | 1.78% |  |
Fund II | New Market Tax Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Income recognized from tax credit transactions |  | $ 5,000,000.0 |  |  |
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 |  |  | $ 1,400,000 |  |
Fund II | City Point Project | New Market Tax Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Income recognized from tax credit transactions |  | $ 5,000,000.0 |  |  |
Fund II | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of mortgage loans | loan |  |  | 1 |  |
Fund V | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of mortgage loans | loan |  |  | 5 | 4 |
Borrowings, amount |  |  |  | $ 109,500,000 |
Fund IV | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of mortgage loans | loan |  |  | 3 |  |
Repayments of debt |  |  | $ 38,200,000 |  |
Number of notes repaid | loan |  |  |  | 3 |
Fund IV | Mortgages One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt |  |  |  | $ 27,200,000 |
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 |  |
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 |  |  |  | 24,600,000 |
Core Portfolio |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, notional amount |  |  | 562,560,000 |  |
Core Portfolio | Maturing In 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount drawn on loan |  |  |  | 50,000,000.0 |
Core Portfolio | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt |  |  |  | 40,400,000 |
Scheduled principal payment |  |  |  | $ 6,700,000 |
Number of notes repaid | loan |  |  |  | 1 |
Core Portfolio | Mortgages | Brandywine Portfolio |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt default, amount |  |  | $ 26,300,000 | $ 26,300,000 |
Debt instrument, maturity date |  |  | Jul. 01, 2016 |  |
Interest rate, stated percentage |  |  | 6.00% |  |
Debt default interest |  |  | 5.00% |  |
Claim amount exclusive of accruing interest, default interest, fees and costs | $ 33,000,000.0 |  |  |  |
Core Portfolio | Mortgages | Maturing In 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowings, amount |  |  |  | $ 73,500,000 |
LIBOR | Interest Rate Swaps |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative weighted average interest rate |  |  | 2.43% |  |
LIBOR | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.70% |  |
LIBOR | Mortgages | Maturing from May 2019 to January 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 2.08% |  |
LIBOR | Mortgages | Maturing from April 2022 though December 2024. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.86% |  |
LIBOR | Mortgages | Maturities Ranging from November 2019 through January 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 3.65% |  |
LIBOR | Mortgages | Maturing Ranging from December 2020 though May 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 2.96% |  |
LIBOR | Fund V | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.99% |
LIBOR | Fund IV | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 2.35% |  |
LIBOR | Fund IV | Mortgages One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.81% |
LIBOR | Fund III | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |
LIBOR | Core Portfolio | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.65% |
LIBOR | Core Portfolio | Mortgages | Maturing In 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.50% |

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