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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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The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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