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Recent Transactions (Details) (USD $)
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9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | |||||||||||
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Sep. 30, 2012
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Sep. 30, 2012
Roseland Partners LLC [Member]
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Sep. 30, 2012
Roseland Partners LLC [Member]
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Sep. 30, 2012
Roseland Partners LLC [Member]
Multi-Family Properties [Member]
property
item
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Sep. 30, 2012
Roseland Partners LLC [Member]
Condo-Residential Properties [Member]
property
item
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Sep. 30, 2012
Roseland Partners LLC [Member]
Commercial Properties [Member]
sqft
property
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Sep. 30, 2012
Roseland Partners LLC [Member]
In-Process Development Projects [Member]
property
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Sep. 30, 2012
Roseland Partners LLC [Member]
In-Process Development Projects [Member]
Multi-Family Properties [Member]
item
property
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Sep. 30, 2012
Roseland Partners LLC [Member]
In-Process Development Projects [Member]
Garages [Member]
item
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Sep. 30, 2012
Roseland Partners LLC [Member]
In-Process Development Projects [Member]
Retail [Member]
sqft
property
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Sep. 30, 2012
Roseland Partners LLC [Member]
Interests Or Options In Land Parcels [Member]
Multi-Family Properties [Member]
item
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Sep. 30, 2012
Roseland Partners LLC [Member]
Interests Or Options In Land Parcels [Member]
Commercial Properties [Member]
sqft
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Sep. 30, 2012
Roseland Partners LLC [Member]
Interests Or Options In Land Parcels [Member]
Hotel [Member]
item
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Mar. 31, 2012
95 Chestnut Ridge Road [Member]
sqft
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Jul. 25, 2012
95 Chestnut Ridge Road [Member]
sqft
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| Recent Transactions [Line Items] | |||||||||||||||
| Number of real estate properties | 6 | 1 | 4 | 13 | 9 | 2 | 2 | ||||||||
| Number of units | 1,769 | 4 | 2,149 | 5,980 | 321 | ||||||||||
| Area of property (in square feet) | 212,000 | 35,400 | 736,000 | 47,700 | 47,700 | ||||||||||
| Number of parking spaces | 1,591 | ||||||||||||||
| Aggregate consideration for acquisition | $ 134,600,000 | $ 134,600,000 | |||||||||||||
| Business acquisition, cash paid | 115,000,000 | 115,000,000 | |||||||||||||
| Business acquisition, debt assumed | 4,000,000 | 4,000,000 | |||||||||||||
| Business acquisition, additional contingent cash payment | 15,600,000 | 15,600,000 | |||||||||||||
| Business acquisition, earn out period | 3 years | ||||||||||||||
| Transaction costs | 3,800,000 | 6,300,000 | |||||||||||||
| Contingent purchase price measurement period | 33 months | ||||||||||||||
| Amount of cash deposited to escrow | 34,000,000 | ||||||||||||||
| Proceeds from the sale of property | 4,023,000 | ||||||||||||||
| Valuation allowance recognized | $ 500,000 | ||||||||||||||