Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Business Overview:
Gross investment amount, total	$ 3,200,000,000	$ 3,200,000,000
Number of real estate properties	201	201
Total number of company owned real estate properties	200	200
Number of states that the Company owns real estate in, whole units	30	30
Square footage of owned real estate properties	14,300,000	14,300,000
Approximate square feet for which Nationwide property management services provided by company	9,700,000	9,700,000
Interest and Other Income, Net [Member]
Interest and Other Income, Net [Abstract]
Reimbursement of prior period operating expenses	1,900,000	1,900,000
Gain on insurance proceeds		$ 300,000