Background (Details) $ in Billions	6 Months Ended
	Jun. 30, 2016 USD ($) ft²
Nature of Business [Line Items]
Total Market Capitalization | $	$ 12.4
Investment-grade client tenants as a percentage of total annualized base rent	53.00%
Percentage of leases which are triple net leases	96.00%
Percentage of leases containing effective annual rent escalations	95.00%
Percentage of leases providing for recapture of certain capital expenditures	94.00%
Minimum
Nature of Business [Line Items]
Effective annual rent escalations (as a percent)	3.00%
Maximum
Nature of Business [Line Items]
Effective annual rent escalations (as a percent)	3.50%
North America
Nature of Business [Line Items]
Total Square Footage of Asset Base	24,400,303
Area of Real Estate Property	18,819,315