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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 USD ($) community Claim home plaintiff building $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |
Weighted average common shares - basic (in shares) | shares | 137,068,874 | 136,785,880
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 454,868 | 589,664
Weighted average common shares - diluted (in shares) | shares | 137,531,242 | 137,383,044
Calculation of Earnings per Share - basic |  |
Net income attributable to common stockholders | $ | $ 235,875 | $ 237,931
Net income allocated to unvested restricted shares | $ | (652) | (632)
Net income attributable to common stockholders, adjusted | $ | $ 235,223 | $ 237,299
Weighted average common shares - basic (in shares) | shares | 137,068,874 | 136,785,880
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.72 | $ 1.73
Calculation of Earnings per Share - diluted |  |
Net income attributable to common stockholders | $ | $ 235,875 | $ 237,931
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships | $ | 11 | 10
Adjusted net income attributable to common stockholders | $ | $ 235,886 | $ 237,941
Weighted average common shares - diluted (in shares) | shares | 137,531,242 | 137,383,044
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.72 | $ 1.73
Loss Contingencies [Line Items] |  |
Number of operating apartment communities | community | 260 |
Number of apartment homes included in operating apartment communities owned | home | 74,952 |
Avalon at Edgewater [Member] |  |
Loss Contingencies [Line Items] |  |
Total number of class action lawsuits | 5 |
Number of operating apartment communities | building | 2 |
Number of operating apartment communities, uninhabitable | building | 1 |
Number of units in operating apartment communities, uninhabitable | home | 240 |
Number of apartment homes included in operating apartment communities owned | home | 168 |
Loss contingency, new class action claims filed number | 3 |
Loss contingency, total class action claims filed number | 4 |
Loss contingency, new claims filed, number | 19 |
Loss contingency, number of plaintiffs | plaintiff | 146 |
Loss contingency, new subrogation claims filed, number | 5 |
Loss contingency, subrogation claims filed dismissed, number | 1 |
Loss contingency, subrogation claims filed pending, number | 4 |

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