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Investment in Real Estate - Net Non-Cash Impairment Charges (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate [Abstract]
Sold Operating Properties - Discontinued Operations		$ 2,652	$ 1,121
Operating Properties - Continuing Operations		0	(20)
Total Net Impairment	$ 0us-gaap_ImpairmentOfRealEstate	$ 2,652us-gaap_ImpairmentOfRealEstate	$ 1,101us-gaap_ImpairmentOfRealEstate

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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