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Investments in Real Estate - Summary of Disposition of Property's (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Real Estate Properties [Line Items] |  |  |  |  |  |
Sale Price |  | $ 59,730 | $ 154,500 |  | $ 77,300 |
Gain (impairment loss) on sale |  | $ 7,843 | $ 35,197 | [1] | $ 10,564 | [2]
Aventine Greenville |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  |  | Dec. 20, 2018 |
Sale Price |  |  |  |  | $ 52,500 |
Gain (impairment loss) on sale | [2] |  |  |  | $ 6,119 |
Arbors At The Reservoir |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  |  | Dec. 27, 2018 |
Sale Price |  |  |  |  | $ 24,800 |
Gain (impairment loss) on sale | [2] |  |  |  | $ 4,445 |
Trails At Signal Mountain |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  | Oct. 27, 2020 |  |  |  |
Sale Price |  | $ 20,000 |  |  |  |
Gain (impairment loss) on sale |  | $ 6,237 |  |  |  |
Live Oak Trace |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale | [3] | Nov. 10, 2020 |  |  |  |
Sale Price | [3] | $ 25,400 |  |  |  |
Gain (impairment loss) on sale | [3] | $ (1,931) |  |  |  |
Lakeshore on the Hill |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  | Nov. 23, 2020 |  |  |  |
Sale Price |  | $ 14,330 |  |  |  |
Gain (impairment loss) on sale |  | $ 3,537 |  |  |  |
Reserve At Eagle Ridge [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  | Apr. 30, 2019 |  |  |
Sale Price |  |  | $ 42,000 |  |  |
Gain (impairment loss) on sale | [1] |  | $ 12,294 |  |  |
Little Rock, AR Portfolio [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  | Jul. 18, 2019 |  |  |
Sale Price |  |  | $ 56,500 |  |  |
Gain (impairment loss) on sale | [1] |  | $ 2,220 |  |  |
Iron Rock [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  | Dec. 17, 2019 |  |  |
Sale Price |  |  | $ 56,000 |  |  |
Gain (impairment loss) on sale | [1] |  | $ 20,683 |  |  |
[1] | The gain for these properties is net of $7,417 of defeasance and debt prepayment costs
[2] | The gain for these properties is net of $911 of debt prepayment costs.
[3] | Includes a $1,840 impairment charge recorded in the three months ended September 30, 2020.

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