Summary of Significant Accounting Policies - Real Estate Properties (Details)	3 Months Ended
	Mar. 31, 2017
Land Improvements [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	3 years
Land Improvements [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	15 years
Building [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	20 years
Building [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	40 years
Building Improvements [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	3 years
Building Improvements [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	39 years 10 months
Tenant Improvements [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	2 years 4 months
Tenant Improvements [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	6 years 11 months
Lease Intangibles [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	1 year 4 months 15 days
Lease Intangibles [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	13 years 8 months
Personal Property [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	3 years
Personal Property [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	10 years