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Business Combinations (Textual) (Details) $ / shares in Units, $ in Thousands, shares in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 01, 2013 USD ($) ft² Communities properties $ / shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) shares | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business Combinations, Other Consideration | $ 7,300 |  |  |
Business Combination, Merger and Integration Related Expenses |  | $ 11,500 | $ 37,500 |
Parent Company [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired properties, purchase price |  | $ 0 | (2,162,876) | $ 0
Parent Company [Member] | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of Apartment Communities Acquired in Real Estate Property | Communities | 115 |  |  |
Number Of Units Acquired In Real Estate Property | Communities | 34,370 |  |  |
Number of Commercial Properties Acquired in Real Estate Property | properties | 4 |  |  |
Acquired properties, purchase price | $ (2,162,876) |  | $ (2,162,876) |
Share Price | $ / shares | $ 62.56 |  |  |
Stock Issued During Period, Shares, Acquisitions | shares |  |  | 31.9 |
Parent Company [Member] | Commercial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Square footage of real estate property (square foot) | ft² | 806,000 |  |  |
Noncontrolling Interest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares |  |  | 2.6 |

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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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