Summary of Significant Accounting Policies (Details) ft² in Millions, $ in Billions	Sep. 30, 2016 USD ($) ft² state property
Business Overview:
Gross investment amount, total | $	$ 3.5
Number of real estate properties | property	202
Number of states that the Company owns real estate in, whole units | state	29
Square footage of owned real estate properties	14.5
Approximate square feet for which Nationwide property management services provided by company	10.1