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Summary of Properties Classified as Held for Sale (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) Property | Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items] |  |
Number of units located with multifamily properties | Property | 15,860 |
Net Carrying Value | $ | $ 141,853,000 | $ 0
Held-for-sale |  |
Real Estate Properties [Line Items] |  |
Number of units located with multifamily properties | Property | 1,348 |
Net Carrying Value | $ | $ 141,853,000 | $ 0
Held-for-sale | Reserve At Eagle Ridge [Member] |  |
Real Estate Properties [Line Items] |  |
Location | Waukegan, IL |
Number of units located with multifamily properties | Property | 370 |
Net Carrying Value | $ | $ 26,941,000 |
Held-for-sale | Carrington Park [Member] |  |
Real Estate Properties [Line Items] |  |
Location | Little Rock, AR |
Number of units located with multifamily properties | Property | 202 |
Net Carrying Value | $ | $ 20,581,000 |
Held-for-sale | Arbors At The Reservoir [Member] |  |
Real Estate Properties [Line Items] |  |
Location | Ridgeland, MS |
Number of units located with multifamily properties | Property | 170 |
Net Carrying Value | $ | $ 19,411,000 |
Held-for-sale | Stonebridge At The Ranch [Member] |  |
Real Estate Properties [Line Items] |  |
Location | Little Rock, AR |
Number of units located with multifamily properties | Property | 260 |
Net Carrying Value | $ | $ 29,598,000 |
Held-for-sale | Aventine Greenville [Member] |  |
Real Estate Properties [Line Items] |  |
Location | Greenville, SC |
Number of units located with multifamily properties | Property | 346 |
Net Carrying Value | $ | $ 45,322,000 |

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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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