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Consolidation and Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) ft² in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) shares | Jun. 30, 2016 USD ($) ft² Property apartmentunits States Communities shares | Jun. 30, 2015 USD ($) shares
Real Estate Properties [Line Items] |  |  |
General Partners' Capital Account, Units Outstanding | shares | 75,375,027 | 75,524,086 | 75,375,027
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest |  | 94.80% | 94.70%
Number of owned or owned interests of apartment communities | Property |  | 256 |
Number of apartments included in a community | apartmentunits |  | 80,300 |
Number of states in which apartment units are located | States |  | 15 |
Percentage Of Ownership Interests |  | 100.00% |
Maximum [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Percentage Of Ownership Interests |  | 100.00% |
Development Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of owned or owned interests of apartment communities | Communities |  | 4 |
Number of units under development community | Property |  | 628 |
Development Properties [Member] | Expected Costs [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Development and capital improvements in progress |  | $ 96,900 |
Development Properties [Member] | Costs Incurred to Date [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Development and capital improvements in progress |  | $ 49,400 |
Retail |  |  |
Real Estate Properties [Line Items] |  |  |
Number of owned or owned interests of apartment communities | Property |  | 6 |
Square Footage of Real Estate Property | ft² |  | 194 |
Interest Expense |  |  |
Real Estate Properties [Line Items] |  |  |
Prior Period Reclassification Adjustment | $ 900 |  | $ 1,800
Fair Market Value Adjustment and Debt Issuance Cost [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Prior Period Reclassification Adjustment |  |  | $ 1,800
Secured Debt [Member] | $750 million unsecured revolving credit facility [Member] | Fair Market Value Adjustment and Debt Issuance Cost [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ (19,019) |

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