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Summary of Disposition of Property's (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sale Price |  | $ 154,500 |  | $ 77,300 |  | $ 86,800 |
Gain (loss) on sale |  | $ 35,197 | [1] | $ 10,564 | [2] | $ 18,910 | [3]
Aventine Greenville |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date of Sale |  |  |  | Dec. 20, 2018 |  |  |
Sale Price |  |  |  | $ 52,500 |  |  |
Gain (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 (loss) on sale | [2] |  |  | $ 4,445 |  |  |
Copper Mill |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date of Sale |  |  |  |  |  | May 05, 2017 |
Sale Price |  |  |  |  |  | $ 32,000 |
Gain (loss) on sale | [3] |  |  |  |  | $ 15,595 |
Heritage Trace |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date of Sale |  |  |  |  |  | Jun. 01, 2017 |
Sale Price |  |  |  |  |  | $ 11,600 |
Gain (loss) on sale | [3] |  |  |  |  | $ (1,256) |
Berkshire Square |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date of Sale |  |  |  |  |  | Jun. 09, 2017 |
Sale Price |  |  |  |  |  | $ 16,000 |
Gain (loss) on sale | [3] |  |  |  |  | $ 1,510 |
Crossings |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date of Sale |  |  |  |  |  | Nov. 28, 2017 |
Sale Price |  |  |  |  |  | $ 27,200 |
Gain (loss) on sale | [3] |  |  |  |  | $ 3,061 |
Reserve At Eagle Ridge [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date of Sale |  | Apr. 30, 2019 |  |  |  |  |
Sale Price |  | $ 42,000 |  |  |  |  |
Gain (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 (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 (loss) on sale | [1] | $ 20,683 |  |  |  |  |
[1] | The gain (loss) for these properties is net of $7,417 of defeasance and debt prepayment premium costs.
[2] | The gain (loss) for these properties is net of $911 of defeasance and debt prepayment premium costs.
[3] | The gain (loss) for these properties is net of $4,251 of defeasance and debt prepayment costs.

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