Net Loss Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss attributable to the Company	$ (280,398)	$ (80,201)	[1]	$ (626,562)	$ (293,684)	[1]
Less: dividends declared on preferred shares and participating securities	37,643	199		84,366	625
Net loss attributable to common stockholders	(318,041)	(80,400)		(710,928)	(294,309)
Weighted average common units outstanding	902,096,102	221,707,920		756,289,984	196,254,575
Basic and diluted net loss per share from continuing operations attributable to common stockholders	$ (0.35)	$ (0.36)	[1]	$ (0.94)	$ (1.50)	[1]
Basic and diluted net loss per unit attributable to common unitholders		$ (0.36)			$ (1.50)
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)				5,807,504
ARC Properties Operating Partnership, L.P. [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss attributable to the Company	(288,202)	(83,354)		(650,720)	(301,566)
Less: dividends declared on preferred shares and participating securities	37,643	199		84,366	625
Net loss attributable to common stockholders	$ (325,845)	$ (83,553)		$ (735,086)	$ (302,191)
Weighted average common units outstanding	926,801,361	231,682,236		781,112,325	204,318,637
Basic and diluted net loss per unit attributable to common unitholders	$ (0.35)	$ (0.36)		$ (0.94)	$ (1.48)

[1] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Consolidated Financial Statements.