Property Acquired, Property Sold, Property Held For Sale, Property Held For And Under Development, And Property And Equipment (Narrative) (Details)	0 Months Ended			3 Months Ended		9 Months Ended				0 Months Ended				0 Months Ended
	Feb. 21, 2012 USD ($) property acre	Feb. 21, 2012 AUD acre	Jan. 10, 2012 USD ($) acre item	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2012 Chief Executive Officer [Member]	Oct. 05, 2012 Indooroopilly Property [Member] USD ($)	Oct. 05, 2012 Indooroopilly Property [Member] AUD	Sep. 30, 2012 Indooroopilly Property [Member] USD ($)	Sep. 30, 2012 Indooroopilly Property [Member] AUD	Jul. 20, 2012 Lake Taupo [Member] USD ($)	Jul. 20, 2012 Lake Taupo [Member] NZD	Jun. 30, 2012 Lake Taupo [Member] USD ($)	Jun. 30, 2012 Lake Taupo [Member] NZD
Property Acquired, Property Sold, Property Held For Sale, Property Held For And Under Development, And Property And Equipment [Line Items]
Area of property acquired (acres)	1.1	1.1	202
Number of residential units			843
Payment to acquire property			$ 5,500,000
Ownership interest in property acquired									50.00%
Number of properties sold	3	3
Proceeds from the sale property	1,900,000	1,800,000								12,400,000	12,000,000			3,900,000	4,900,000
Depreciation expense for property and equipment				3,600,000	4,000,000	11,000,000	11,700,000
Assets held for sale				12,258,000		12,258,000		14,495,000				12,500,000	12,100,000			2,100,000	2,600,000
Impairment expense												$ 283,000	272,000