Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended	1 Months Ended			9 Months Ended	1 Months Ended
	Sep. 30, 2013 acre	Jun. 30, 2013 acre	Sep. 30, 2013 acre	Sep. 30, 2012	Jun. 30, 2013	Sep. 30, 2013 acre	Sep. 30, 2012	Dec. 31, 2012	Apr. 30, 2013 Camden Post Oak [Member]	Sep. 30, 2013 Camden Sotelo [Member]	Sep. 30, 2013 Camden Vantage [Member]	Sep. 30, 2013 Assets Held-for-sale [Member]	Oct. 31, 2013 Subsequent Event [Member]
Business Acquisition [Line Items]
Number of operating properties acquired	2								1
Number of apartment units in wholly owned property acquired									356	170	592
Purchase price of operating properties acquired									$ 108,500,000	$ 34,000,000	$ 82,500,000
Number of operating properties held for sale												5
Number of apartment homes in operating properties sold			500		1,296			3,213				1,280
Number of operating properties sold			2		2			11					0
Proceeds from Sale of Property Held-for-sale													34,600,000
Acres of land acquired		38.8
Payments to Acquire Land		25,800,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						5,400,000
Business Combination, Pro Forma Information, Property Expenses Since Acquisition Date, Actual						2,200,000
Restricted cash related to the proceeds from the discpostion of two operating properties	54,100,000		54,100,000			54,100,000
Acres of land sold	3.7		3.7			3.7
Sales price of land parcels						6,600,000
Gain on sale of land			$ 0	$ 0		$ 698,000	$ 0