PRINCIPLES OF CONSOLIDATION (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2014 joint_ventures	Dec. 31, 2013 joint_ventures
Subsidiaries [Line Items]
Joint Ventures	2	2
University Business Center [Member]
Subsidiaries [Line Items]
Joint venture ownership interest	80.00%	80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests	100.00%	100.00%
Castilian Research Center [Member]
Subsidiaries [Line Items]
Joint venture ownership interest	80.00%	80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests	100.00%	100.00%
Industry Distribution Center II - undivided tenant [Member]
Subsidiaries [Line Items]
Tenant-in-common interest	50.00%	50.00%