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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, 2015 USD ($) community home building $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) community Claim home Citation plaintiff building $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares
Loss Contingencies [Line Items] |  |  |  |
Number of Real Estate Properties | community | 255 |  | 255 |
Number of apartment homes included in operating apartment communities owned | home | 74,202 |  | 74,202 |
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic | shares | 133,669,584 | 131,330,078 | 132,516,847 | 130,165,873
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 1,032,376 | 568,417 | 1,139,423 | 554,627
Weighted average common shares - diluted | shares | 134,709,460 | 131,905,995 | 133,663,770 | 130,728,000
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ 206,142 | $ 241,100 | $ 586,610 | $ 540,929
Net income allocated to unvested restricted shares | (467) | (366) | (1,444) | (858)
Net income attributable to common stockholders, adjusted | $ 205,675 | $ 240,734 | $ 585,166 | $ 540,071
Weighted average common shares - basic | shares | 133,669,584 | 131,330,078 | 132,516,847 | 130,165,873
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.54 | $ 1.83 | $ 4.42 | $ 4.15
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ 206,142 | $ 241,100 | $ 586,610 | $ 540,929
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 9 | 9 | 28 | 26
Adjusted net income available to common stockholders | $ 206,151 | $ 241,109 | $ 586,638 | $ 540,955
Weighted average common shares - diluted | shares | 134,709,460 | 131,905,995 | 133,663,770 | 130,728,000
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.53 | $ 1.83 | $ 4.39 | $ 4.14
Options to purchase shares of common stock excluded from computation of earnings per share amount (in shares) | shares |  |  |  | 1,499
Estimated forfeiture rate of stock options (as a percent) |  |  | 1.00% |
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 | Claim |  |  | 4 |
Loss Contingency Consolidated Class Action Claims | Claim |  |  | 1 |
Loss Contingency, New Claims Filed, Number | Claim |  |  | 17 |
Loss Contingency, Number of Plaintiffs | plaintiff |  |  | 133 |
Loss Contingency, OSHA Citations | Citation |  |  | 2 |
Loss Contingency, Insurance, Percentage Of Policy Amount Company Is Obligated To Fund | 12.00% |  | 12.00% |
Loss Contingency, Insurance, Policy Amount For Calculating Self-Insurance Liability | $ 50,000 |  | $ 50,000 |

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