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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) - Long-term Debt, Type [Domain] $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 USD ($) community home building $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) community Claim home Citation plaintiff building $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares
Loss Contingencies [Line Items] |  |  |  |
Number of Real Estate Properties | community | 257 |  | 257 |
Number of apartment homes included in operating apartment communities owned | home | 74,857 |  | 74,857 |
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic | shares | 131,977,578 | 129,856,335 | 131,930,916 | 129,574,118
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 1,101,361 | 384,486 | 1,192,947 | 356,614
Weighted average common shares - diluted | shares | 133,086,439 | 130,248,321 | 133,131,363 | 129,938,232
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ 172,324 | $ 158,086 | $ 380,469 | $ 299,825
Net income allocated to unvested restricted shares | (445) | (254) | (975) | (487)
Net income attributable to common stockholders, adjusted | $ 171,879 | $ 157,832 | $ 379,494 | $ 299,338
Weighted average common shares - basic | shares | 131,977,578 | 129,856,335 | 131,930,916 | 129,574,118
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.30 | $ 1.22 | $ 2.88 | $ 2.31
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ 172,324 | $ 158,086 | $ 380,469 | $ 299,825
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations | 9 | 9 | 19 | 17
Adjusted net income available to common stockholders | $ 172,333 | $ 158,095 | $ 380,488 | $ 299,842
Weighted average common shares - diluted | shares | 133,086,439 | 130,248,321 | 133,131,363 | 129,938,232
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.29 | $ 1.21 | $ 2.86 | $ 2.31
Options to purchase shares of common stock excluded from computation of earnings per share amount (in shares) | shares |  |  |  | 243,326
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, Number of Plaintiffs | plaintiff |  |  | 120 |
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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