Net Loss Per Share/Unit (Schedule of Earnings Per Share, Basic and Diluted (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss from continuing operations attributable to the Company/Operating Partnership																	$ (977,185)	$ (491,466)	$ (40,961)
Net loss from discontinued operations attributable to common stockholders/Operating Partnership																	0	(33)	(691)
Net loss attributable to the Company	(350,623)		(280,398)		(54,720)		(291,444)		(197,815)		(80,201)		(69,603)		(143,880)		(977,185)	(491,499)	(41,652)
Net loss																	(1,010,912)	(507,815)	(42,237)
Less: dividends to preferred shares and participating securities																	104,057	3,631	368
Net loss attributable to common stockholders/unitholders																	(1,081,242)	(495,130)	(42,020)
Weighted average number of common shares outstanding- basic																	793,150,098	205,341,431	103,306,366
Basic and diluted net loss per share from continuing operations attributable to common stockholders																	$ (1.36)	$ (2.41)	$ (0.40)
Basic and diluted net loss per share from discontinued operations attributable to common stockholders																	$ 0.00	$ 0.00	$ (0.01)
Basic and diluted net loss per share attributable to common stockholders	$ (0.41)	[1]	$ (0.35)	[1]	$ (0.10)	[1]	$ (0.58)	[1]	$ (0.87)	[1]	$ (0.36)	[1]	$ (0.35)	[1]	$ (0.86)	[1]	$ (1.36)	$ (2.41)	$ (0.41)
Member Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)																	23,763,797	9,591,173
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)																	2,684,062
ARC Properties Operating Partnership, L.P. [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss from continuing operations attributable to the Company/Operating Partnership																	(1,010,912)	(507,781)	(41,492)
Net loss from discontinued operations attributable to common stockholders/Operating Partnership																	0	(34)	(745)
Net loss attributable to the Company	(360,038)		(288,202)		(56,870)		(305,648)		(206,233)		(83,354)		(72,275)		(145,939)		(1,010,758)	(507,815)	(42,237)
Net loss																	(1,010,912)	(507,815)	(42,237)
Less: dividends to preferred shares and participating securities																	104,057	3,631	368
Net loss attributable to common stockholders/unitholders																	$ (1,114,969)	$ (511,446)	$ (42,605)
Weighted average number of common shares outstanding- basic																	817,883,937	214,352,289	104,083,222
Basic and diluted net loss from continuing operations per unit attributable to common unitholders																	$ (1.36)	$ (2.39)	$ (0.40)
Basic and diluted net loss from discontinued operations per unit attributable to common unitholders																	$ 0.00	$ 0.00	$ (0.01)
Basic and diluted net loss per unit attributable to common unitholders	$ (0.41)	[2]	$ (0.35)	[2]	$ (0.10)	[2]	$ (0.57)	[2]	$ (0.86)	[2]	$ (0.36)	[2]	$ (0.35)	[2]	$ (0.85)	[2]	$ (1.36)	$ (2.39)	$ (0.41)

[1] The sum of the quarterly net loss per share amounts do not agree to the full year net loss per share amounts. We calculate net loss per share based on the weighted-average number of outstanding shares during the reporting period. The average number of shares fluctuates throughout the year and can therefore produce a full year result that does not agree to the sum of the individual quarters.

[2] The sum of the quarterly net loss per unit amounts do not agree to the full year net loss per unit amounts. We calculate net loss per unit based on the weighted-average number of outstanding unit during the reporting period. The average number of units fluctuates throughout the year and can therefore produce a full year result that does not agree to the sum of the individual quarters.