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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 USD ($) community Claim home building $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) community Claim home plaintiff building $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic (in shares) | shares | 136,997,756 | 133,669,584 | 136,901,164 | 132,516,847
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 499,798 | 1,032,376 | 533,642 | 1,139,423
Weighted average common shares - diluted (in shares) | shares | 137,505,054 | 134,709,460 | 137,442,306 | 133,663,770
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ | $ 356,392 | $ 206,142 | $ 791,767 | $ 586,610
Net income allocated to unvested restricted shares | $ | (872) | (467) | (2,036) | (1,444)
Net income attributable to common stockholders, adjusted | $ | $ 355,520 | $ 205,675 | $ 789,731 | $ 585,166
Weighted average common shares - basic (in shares) | shares | 136,997,756 | 133,669,584 | 136,901,164 | 132,516,847
Earnings per common share - basic (in dollars per share) | $ / shares | $ 2.60 | $ 1.54 | $ 5.77 | $ 4.42
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ | $ 356,392 | $ 206,142 | $ 791,767 | $ 586,610
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | $ | 10 | 9 | 30 | 28
Adjusted net income available to common stockholders | $ | $ 356,402 | $ 206,151 | $ 791,797 | $ 586,638
Weighted average common shares - diluted (in shares) | shares | 137,505,054 | 134,709,460 | 137,442,306 | 133,663,770
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 2.59 | $ 1.53 | $ 5.76 | $ 4.39
Estimated forfeiture rate of stock options (as a percent) |  |  | 0.80% |
Loss Contingencies [Line Items] |  |  |  |
Number of Real Estate Properties | community | 261 |  | 261 |
Number of apartment homes included in operating apartment communities owned | home | 75,254 |  | 75,254 |
Avalon at Edgewater [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of Real Estate Properties | building | 2 |  | 2 |
Number Of Real Estate Properties, Uninhabitable | building | 1 |  | 1 |
Number Of Units In Real Estate Property, Uninhabitable | home | 240 |  | 240 |
Number of apartment homes included in operating apartment communities owned | home | 168 |  | 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 |  |  | 20 |
Loss Contingency, Number of Plaintiffs | plaintiff |  |  | 141 |
Loss Contingency, Pending Claims, Number | 19 |  | 19 |
Loss Contingency New Subrogation Claims Filed Number |  |  | 3 |
Loss Contingency Subrogation Claims Filed Dismissed Number |  |  | 1 |
Loss Contingency Subrogation Claims Filed Pending Number |  |  | 2 |

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