Quarterly report pursuant to Section 13 or 15(d)

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

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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