Summary of Significant Accounting Policies (Details) ft² in Millions, $ in Billions	Sep. 30, 2015 USD ($) ft² state property
Business Overview:
Gross investment amount, total | $	$ 3.2
Number of real estate properties	195
Total number of company owned real estate properties	195
Number of states that the Company owns real estate in, whole units | state	30
Square footage of owned real estate properties | ft²	14.1
Approximate square feet for which Nationwide property management services provided by company | ft²	9.6