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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, 2018 USD ($) community home building $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) community Claim home building $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares
Basic and diluted shares outstanding |  |  |  |
Weighted average common shares - basic (in shares) | shares | 137,848,788 | 137,715,192 | 137,818,076 | 137,457,293
Weighted average DownREIT units outstanding (in shares) | shares | 7,500 | 7,500 | 7,500 | 7,500
Effect of dilutive securities (in shares) | shares | 466,776 | 584,354 | 405,148 | 541,399
Weighted average common shares - diluted (in shares) | shares | 138,323,064 | 138,307,046 | 138,230,724 | 138,006,192
Calculation of Earnings per Share - basic |  |  |  |
Net income attributable to common stockholders | $ | $ 192,486 | $ 238,248 | $ 588,791 | $ 639,348
Net income allocated to unvested restricted shares | $ | (555) | (672) | (1,722) | (1,794)
Net income attributable to common stockholders, adjusted | $ | $ 191,931 | $ 237,576 | $ 587,069 | $ 637,554
Weighted average common shares - basic (in shares) | shares | 137,848,788 | 137,715,192 | 137,818,076 | 137,457,293
Earnings per common share - basic (in dollars per share) | $ / shares | $ 1.39 | $ 1.73 | $ 4.26 | $ 4.64
Calculation of Earnings per Share - diluted |  |  |  |
Net income attributable to common stockholders | $ | $ 192,486 | $ 238,248 | $ 588,791 | $ 639,348
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships | $ | 11 | 11 | 33 | 32
Adjusted net income attributable to common stockholders | $ | $ 192,497 | $ 238,259 | $ 588,824 | $ 639,380
Weighted average common shares - diluted (in shares) | shares | 138,323,064 | 138,307,046 | 138,230,724 | 138,006,192
Earnings per common share - diluted (in dollars per share) | $ / shares | $ 1.39 | $ 1.72 | $ 4.26 | $ 4.63
Loss Contingencies [Line Items] |  |  |  |
Number of operating apartment communities | community | 271 |  | 271 |
Number of apartment homes included in operating apartment communities owned | home | 78,383 |  | 78,383 |
Avalon at Edgewater |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of operating apartment communities | building | 2 |  | 2 |
Number of operating apartment communities, uninhabitable | building | 1 |  | 1 |
Number of units in operating apartment communities, 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 |  |  | 3 |
Loss contingency class action claims filed, number of apartments included in settlement | Claim |  |  | 66 |
Loss Contingency Class Action Claims Filed, Number of Apartments Included in Settlement Submitted | Claim |  |  | 44 |
Loss Contingency Class Action Claims Filed, Number of Apartments Included in Settlement Submitted Amount | $ |  |  | $ 6,900 |
Loss Contingency Class Action Claims Filed, Number of Apartments Issued Awards By Claims Adjuster | Claim |  |  | 35 |
Loss Contingency Class Action Claims Filed, Timing Remaining for Claim Evaluation |  |  | 2 months |
Loss Contingency Class Action Claims Filed, Number of Apartments in Settlement Previously Resolved | Claim |  |  | 60 |
Loss Contingency Subrogation Claims Filed Pending Not Dismissed Number | Claim |  |  | 1 |
Loss contingency, total class action claims filed number | Claim |  |  | 4 |

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