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Summary of Disposition of Property's (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate Properties [Line Items] |  |  |  |  |  |
Sale Price |  | $ 77,300 |  | $ 86,800 |  | $ 88,000
Gain (loss) on sale |  | $ 10,564 | [1] | $ 18,910 | [2] | $ 31,785
Aventine Greenville |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  | Dec. 20, 2018 |  |  |  |
Sale Price |  | $ 52,500 |  |  |  |
Gain (loss) on sale | [1] | $ 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 | [1] | $ 4,445 |  |  |  |
Copper Mill |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  | May 05, 2017 |  |
Sale Price |  |  |  | $ 32,000 |  |
Gain (loss) on sale | [2] |  |  | $ 15,595 |  |
Heritage Trace |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  | Jun. 01, 2017 |  |
Sale Price |  |  |  | $ 11,600 |  |
Gain (loss) on sale | [2] |  |  | $ (1,256) |  |
Berkshire Square |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  | Jun. 09, 2017 |  |
Sale Price |  |  |  | $ 16,000 |  |
Gain (loss) on sale | [2] |  |  | $ 1,510 |  |
Crossings |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  | Nov. 28, 2017 |  |
Sale Price |  |  |  | $ 27,200 |  |
Gain (loss) on sale | [2] |  |  | $ 3,061 |  |
Cumberland Glen |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale | [3] |  |  |  |  | Feb. 18, 2016
Sale Price | [3] |  |  |  |  | $ 18,000
Gain (loss) on sale | [3] |  |  |  |  | $ 2,452
Belle Creek |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  |  |  | Apr. 07, 2016
Sale Price |  |  |  |  |  | $ 23,000
Gain (loss) on sale |  |  |  |  |  | $ 14,191
Tresa |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Date of Sale |  |  |  |  |  | May 05, 2016
Sale Price |  |  |  |  |  | $ 47,000
Gain (loss) on sale |  |  |  |  |  | $ 15,142
[1] | The gain (loss) for these properties is net of $911 of debt prepayment premium costs.
[2] | The gain (loss) on sale for these properties is net of $4,251 of defeasance and debt prepayment premium costs.
[3] | Gain (loss) on sale related to this property includes a defeasance premium of $1,343.

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