Organization and Business Operations (Details) $ / shares in Units, shares in Thousands	6 Months Ended		42 Months Ended	55 Months Ended
	Jun. 30, 2015 USD ($) real_estate_investment metropolitan segment property $ / shares	Jun. 30, 2014 USD ($)	Jun. 06, 2014 USD ($)	Jun. 30, 2015 USD ($) real_estate_investment metropolitan property $ / shares shares	Dec. 31, 2014 USD ($) $ / shares	Apr. 14, 2014 USD ($)
Organization and Business Operations [Line Items]
Number of reportable business segments | segment	2
Number of Company owned real estate investments | real_estate_investment	48			48
Number of Company owned properties | property	79			79
Number of metropolitan statistical areas in which Company owns real estate investments | metropolitan	44			44
Real estate-related notes receivables, principal amount	$ 10,014,000			$ 10,014,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01			$ 0.01	$ 0.01
Preferred equity investment	$ 127,147,000			$ 127,147,000	$ 0
Redemption of common stock	$ 3,191,000	$ 1,151,000
Consolidated Partnerships [Member]
Organization and Business Operations [Line Items]
Number of Company owned real estate investments | real_estate_investment	2			2
Initial Public Offering [Member]
Organization and Business Operations [Line Items]
Common stock offering, value authorized			$ 1,746,875,000
Common stock offering, gross proceeds raised			$ 1,716,046,000
DRIP Offering [Member]
Organization and Business Operations [Line Items]
Common stock offering, value authorized						$ 100,000,000
Initial Public Offering and DRIP Offering [Member]
Organization and Business Operations [Line Items]
Common stock offering, gross proceeds raised				$ 1,777,372,000
Common stock offering, shares issued | shares				179,051
Redemption of common stock				$ 8,257,000
Offering costs, selling commissions and dealer manager fees				$ 174,639,000
Private Real Estate Corporation [Member] | Series B Redeemable Cumulative Preferred Stock [Member]
Organization and Business Operations [Line Items]
Preferred equity investment, dividend rate percentage	7.875%
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01			$ 0.01
Preferred equity investment	$ 127,147,000			$ 127,147,000