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Consolidation and Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) ft² in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) ft² Property apartmentunits States Communities shares | Mar. 31, 2015 USD ($) shares
Real Estate Properties [Line Items] |  |
General Partners' Capital Account, Units Outstanding | shares | 75,505,025 | 75,345,023
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 | 255 |
Number of apartments included in a community | apartmentunits | 79,896 |
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 | $ 96.7 |
Development Properties [Member] | Costs Incurred to Date [Member] |  |
Real Estate Properties [Line Items] |  |
Development and capital improvements in progress | $ 34.0 |
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 |
Partially Owned Properties [Member] |  |
Real Estate Properties [Line Items] |  |
Number of owned or owned interests of apartment communities | Property | 1 |
Square Footage of Real Estate Property | ft² | 30 |
Building Repairs and Maintenance Expenses [Member] |  |
Real Estate Properties [Line Items] |  |
Prior Period Reclassification Adjustment |  | $ 0.9
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |
Real Estate Properties [Line Items] |  |
Prior Period Reclassification Adjustment | $ 34.0 |
Cash and Cash Equivalents [Member] |  |
Real Estate Properties [Line Items] |  |
Prior Period Reclassification Adjustment |  | $ 2.0

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