Stockholders' Equity (Details) (USD $)	1 Months Ended						6 Months Ended	12 Months Ended	53 Months Ended	66 Months Ended
	Jun. 30, 2014	May 31, 2014	Apr. 30, 2014	Mar. 31, 2014	Feb. 28, 2014	Jan. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014
Common Stock
Net proceeds from issuance of common stock (in shares)									107,600,000
Gross proceeds from issuance of common stock									$ 1,072,900,000
Distribution Reinvestment Plan
Initial purchase price per share under the DRP (in dollars per share)							$ 9.50
Price of shares issued as a percentage of estimated value per share (percent)							95.00%
Period within which the company expects to establish an estimated value per share							18 months
Selling commissions or dealer manager fees that will be paid for sales under DRP							0
Notice period served by board of directors to amend or terminate DRP							10 days
Shares issued pursuant to DRP (shares)							2,200,000	3,400,000		6,900,000
Total proceeds from sale of shares pursuant to DRP							20,962,000	32,649,000		65,400,000
Distributions
Daily amount of distribution accrued per share (in dollars per share)							$ 0.002191781
Annual distribution rate (as a percent)							8.00%
Cash	4,123,000	4,250,000	4,119,000	4,237,000	3,818,000	4,314,000	24,861,000
DRP	3,526,000	3,629,000	3,495,000	3,603,000	3,242,000	3,493,000	20,988,000
Total	7,649,000	7,879,000	7,614,000	7,840,000	7,060,000	7,807,000	45,849,000
Share Repurchase Program
Holding period of shares required for repurchase							1 year
Number of shares repurchased (shares)							404,286	593,226
Total amount of shares repurchased							3,842,000	5,694,000
Repurchase price paid per share (in dollars per share)							$ 9.50
Common Stock
Share Repurchase Program
Total amount of shares repurchased								$ 5,700,000
Repurchase price paid per share (in dollars per share)								$ 9.60