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Business Combinations (Textual) (Details) $ / shares in Units, ft² in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 01, 2016 USD ($) ft² properties Communities $ / shares shares | Dec. 31, 2016 USD ($) shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) shares | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Property shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Joint Ventures |  | $ 2,300,000 |  |  |  |  |  |  |  | $ 2,300,000 |  |
Number Of Units Acquired In Real Estate Property | Property |  |  |  |  |  |  |  |  |  | 1,626 |  |
Business Combinations, Other Consideration | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Merger and Integration Related Expenses |  |  |  |  |  |  |  |  |  |  | $ 0 |
Preferred Stock, Shares Outstanding | shares |  | 867,846 |  |  |  |  |  |  |  | 867,846 |  |
Acquisition Costs, Cumulative |  | $ 339,200,000 |  |  |  |  |  |  |  | $ 339,200,000 |  |
Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding | shares | 868,000 |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Units Acquired In Real Estate Property | Communities | 261 |  |  |  |  |  |  |  |  |  |  |
Development Portfolio [Member] | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Units Acquired In Real Estate Property | Communities | 2,266 |  |  |  |  |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Joint Ventures |  | 2,306,000 |  |  |  | $ 0 |  |  |  | 2,306,000 | 0 |
Total operating revenues |  | 307,198,000 | $ 276,898,000 | $ 272,236,000 | $ 269,016,000 | 263,337,000 | $ 261,998,000 | $ 258,891,000 | $ 258,552,000 | 1,125,348,000 | 1,042,779,000 | $ 992,332,000
Acquired properties, purchase price |  | $ (4,006,586,000) |  |  |  | $ 0 |  |  |  | $ (4,006,586,000) | $ 0 | $ 0
Preferred Stock, Shares Outstanding | shares |  | 867,846 |  |  |  | 0 |  |  |  | 867,846 | 0 |
Parent Company [Member] | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Apartment Communities Acquired in Real Estate Property | Communities | 61 |  |  |  |  |  |  |  |  |  |  |
Number Of Units Acquired In Real Estate Property | Communities | 24,138 |  |  |  |  |  |  |  |  |  |  |
Number of Commercial Properties Acquired in Real Estate Property | properties | 4 |  |  |  |  |  |  |  |  |  |  |
Acquired properties, purchase price | $ (4,006,586,000) |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares | $ 91.41 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares | 38,000,000 |  |  |  |  |  |  |  |  |  |  |
Parent Company [Member] | Commercial | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Square footage of real estate property (square foot) | ft² | 269 |  |  |  |  |  |  |  |  |  |  |
Pro Forma [Member] | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | $ 1,494,298 | $ 1,426,785 |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Merger and Integration Related Expenses |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares | 100,000 |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) [Member] | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Sales Revenue, Net [Member] | Post [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 33,500,000 |  |
Business Combination, Separately Recognized Transactions [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Merger and Integration Related Expenses |  |  |  |  |  |  |  |  |  | $ 40,800,000 |  |

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