Investment in Real Estate - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 sqft Property	Mar. 31, 2013 Property	Dec. 31, 2013 Property
Real Estate Investment Property, Net [Abstract]
Number of industrial properties acquired	1
Gross leasable area (GLA) of industrial properties acquired	300,000
Purchase price of acquisitions	$ 13,400
Number of industrial properties sold	3
Gross leasable area (GLA) of industrial properties sold	100,000
Gain on sale of real estate	735	(2,812)
Number of sold properties included in discontinued operations	3	4	67
Proceeds from sale of industrial properties	3,546
Notes receivable outstanding	35,516		52,605
Net discount of notes receivable outstanding	0		191
Fair value of notes receivable	$ 37,482		$ 53,482