Related Party Transactions and Arrangements (Schedule of Amount Contractually Due and Forgiven in Connection With Operation Related Services) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Related Party Transaction [Line Items]
Due to affiliates	$ 835,000				$ 835,000				$ 0
Acquisition Fee [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0	[1]	11,515,000	[1]	0	[1]	16,851,000	[1]
Related party operation fees and reimbursements, forgiven	0	[1]	0	[1]	0	[1]	0	[1]
Due to affiliates	0	[1]			0	[1]			0	[1]
Financing Fee And Related Cost Reimbursement [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0		5,656,000		0		13,156,000
Related party operation fees and reimbursements, forgiven	0		0		0		0
Due to affiliates	0				0				0
Other Expense Reimbursements [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	549,000		6,545,000		549,000		8,317,000
Related party operation fees and reimbursements, forgiven	0		0		0		0
Due to affiliates	391,000				391,000				0
Transaction Fee [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0		0		0		0
Related party operation fees and reimbursements, forgiven	0		0		0		0
Due to affiliates	0				0				3,455,000
Base Management Fee [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0	[2]	2,000,000	[2]	0	[2]	4,654,000	[2]
Related party operation fees and reimbursements, forgiven	0	[2]	2,000,000	[2]	0	[2]	2,370,000	[2]
Due to affiliates	0	[2]			0	[2]			5,654,000	[2]
Transfer Agent Fee [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0		535,000		344,000		648,000
Related party operation fees and reimbursements, forgiven	0		0		0		0
Due to affiliates	0				0				57,000
Property Management And Leasing Fee [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0	[2]	0	[2]	0	[2]	799,000	[2]
Related party operation fees and reimbursements, forgiven	0	[2]	0	[2]	0	[2]	799,000	[2]
Due to affiliates	0	[2]			0	[2]			217,000	[2]
Strategic Advisory Fees [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0		0		0		920,000
Related party operation fees and reimbursements, forgiven	0		0		0		0
Due to affiliates	0				0				0
Distributions On Class B Units [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	0		7,000		0		9,000
Related party operation fees and reimbursements, forgiven	0		0		0		0
Due to affiliates	0				0				0
Operational Fees And Reimbursements [Member]
Related Party Transaction [Line Items]
Related party operation fees and reimbursements	549,000		26,258,000		893,000		45,354,000
Related party operation fees and reimbursements, forgiven	0		2,000,000		0		3,169,000
Due to affiliates	$ 391,000				$ 391,000				$ 9,383,000

[1] In conjunction with the ARCT III Merger, the payment of acquisition fees was terminated, except with respect to properties that were in ARCP’s or ARCT III’s pipeline at the ARCT III Merger date; any fees that were paid because the Company’s Former Manager or the ARCT III Advisor had sourced and negotiated the purchase price prior to the ARCT III Merger.

[2] The amounts incurred and paid were recognized in merger and other transaction related costs during the six months ended June 30, 2013 as they relate to the ARCT III Merger. The amounts incurred during the six months ended June 30, 2013 were accrued through January 7, 2014, the date prior to transition to self-manag