Real Estate - Real Estate Portfolio (Details)	9 Months Ended
	Sep. 30, 2016 USD ($) ft²
Real Estate Properties [Line Items]
Purchase Price	$ 745,000,000
Square Feet (in sqft) | ft²	4,500,000
Toshiba Tec Property
Real Estate Properties [Line Items]
Purchase Price	$ 35,800,748
Square Feet (in sqft) | ft²	200,800
Acquisition fees and reimbursable expenses	$ 870,409
Contingent advisor payment	0
Netgear [Member]
Real Estate Properties [Line Items]
Purchase Price	$ 44,000,000
Square Feet (in sqft) | ft²	142,700
Acquisition fees and reimbursable expenses	$ 1,000,411
Contingent advisor payment	197,780
Nike [Member]
Real Estate Properties [Line Items]
Purchase Price	$ 45,500,000
Square Feet (in sqft) | ft²	266,800
Acquisition fees and reimbursable expenses	$ 1,139,376
Contingent advisor payment	841,750
Zebra Technologies [Member]
Real Estate Properties [Line Items]
Purchase Price	$ 60,150,000
Square Feet (in sqft) | ft²	283,300
Acquisition fees and reimbursable expenses	$ 1,346,120
Contingent advisor payment	1,112,775
WABCO [Member]
Real Estate Properties [Line Items]
Purchase Price	$ 13,834,500
Square Feet (in sqft) | ft²	145,200
Acquisition fees and reimbursable expenses	$ 456,905
Contingent advisor payment	255,938
IGT [Member]
Real Estate Properties [Line Items]
Purchase Price	$ 66,500,000
Square Feet (in sqft) | ft²	222,300
Acquisition fees and reimbursable expenses	$ 1,521,553
Contingent advisor payment	$ 1,230,250