The aggregate amount of development expenses that were capitalized by the Company during the period.

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Number of shares for redemption of each common unit.

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Operating leases revenue recognition term.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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Amount of interest capitalized during the period.

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-Publisher FASB

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-Glossary Allowance for Funds Used during Construction

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Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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The number of real estate properties owned as of the balance sheet date.

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The number of units in a real estate property owned as of the balance sheet date.

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No definition available.

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- Definition

The number of units of other ownership interests outstanding in a limited partnership or master limited partnership. Does not include limited or general partners' ownership interests.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SAB TOPIC 4.F)

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Organization and Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Agreement Property Apartment shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Agreement Property Apartment shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 shares
Real Estate Properties [Line Items]
Number of units in real estate property \| Agreement	23,723		23,723
Number of real estate properties	60		60
Common stock, shares outstanding \| shares	54,124,000		54,124,000		54,509,000
Common units held by persons other than the Company \| shares	121,000		121,000
Number of shares for redemption of each common unit \| shares	1		1
Operating leases term (in years)			1 year
Revenue recognized lease (in years)			1 year
Aggregate interest costs capitalized to projects under development or construction \| $	$ 1,109	$ 745	$ 3,328	$ 2,345
Development or construction costs \| $	$ 1,237	$ 784	$ 3,585	$ 1,785
Buildings and Components [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			40 years
Other Building and Land Improvements [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			20 years
Furniture, Fixtures and Equipment [Member] \| Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			5 years
Furniture, Fixtures and Equipment [Member] \| Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			10 years
Post Apartment Homes, L.P. [Member]
Real Estate Properties [Line Items]
Ownership interest percentage in Operating Partnership	99.80%	99.80%	99.80%	99.80%
Noncontrolling Owners [Member]
Real Estate Properties [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	0.20%		0.20%
Operating Communities [Member] \| Atlanta, Georgia [Member] \| Geographic Concentration Risk [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage			30.20%
Operating Communities [Member] \| Dallas, Texas [Member] \| Geographic Concentration Risk [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage			21.60%
Operating Communities [Member] \| Washington, D.C. [Member] \| Geographic Concentration Risk [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage			13.30%
Operating Communities [Member] \| Tampa, Florida [Member] \| Geographic Concentration Risk [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage			10.70%
Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of units in real estate property \| Agreement	1,471		1,471
Number of real estate properties	4		4
Unconsolidated Properties [Member] \| Atlanta, Georgia [Member]
Real Estate Properties [Line Items]
Number of real estate properties	3		3
Unconsolidated Properties [Member] \| Washington, D.C. [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1		1
Under Development [Member]
Real Estate Properties [Line Items]
Number of units in real estate property \| Agreement	2,192		2,192
Number of real estate properties \| Apartment	6		6
Cost Capitalization [Member]
Real Estate Properties [Line Items]
Weighted average borrowing costs, percentage	4.30%	4.60%	4.30%	4.60%