Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (150 Main Street, L.L.C.) (Narrative) (Details)

v2.4.0.6
Investments In Unconsolidated Joint Ventures (150 Main Street, L.L.C.) (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Oct. 23, 2012
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity $ 600,000,000  
JMP Eastchester, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Third party ownership percentage   26.25%
Development management and other services fees 15,000  
Hudson Valley Land Holdings, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Third party ownership percentage   47.50%
150 Main Street, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Percentage return on unrecovered capital 8.00%  
Holding and distribution pattern under operating agreement The operating agreement of Eastchester provides, among other things, for the distribution of net operating cash flow to the members, as follows:to HVLH to the extent of its accrued but unpaid preferred return of eight percent on the unrecovered allocated land value, as defined; to the members, pro rata, to the extent of their respective accrued but unpaid return of eight percent on their unrecovered capital percentages; andto the members in accordance with their ownership percentages.  
Eastchester Project [Member]
   
Schedule of Equity Method Investments [Line Items]    
Percentage of interest in venture   26.25%
Total project costs 46,000,000  
Amount of project costs funded by members 8,500,000  
Eastchester Project [Member] | 150 Main Street, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Number of units   108
Construction Loan [Member] | Eastchester Project [Member] | 150 Main Street, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity $ 37,500,000