Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	1 Months Ended	12 Months Ended		12 Months Ended			12 Months Ended			12 Months Ended				12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 Restricted Stock [Member] Equity Plan [Member]	Dec. 31, 2011 Restricted Stock [Member] Equity Plan [Member]	Dec. 31, 2012 Restricted Stock [Member] Equity Plan [Member]	Sep. 30, 2012 Restricted Stock [Member] Equity Plan [Member] Manager [Member]	Feb. 28, 2013 Restricted Stock [Member] Equity Plan [Member] ARC Properties Advisors, LLC [Member] Manager [Member]	Dec. 31, 2012 Restricted Stock [Member] Equity Plan [Member] ARC Properties Advisors, LLC [Member] Manager [Member]	Sep. 30, 2012 Restricted Stock [Member] Director Stock Plan [Member]	Dec. 31, 2012 Restricted Common Stock [Member] Equity Plan [Member]	Dec. 31, 2011 Restricted Common Stock [Member] Equity Plan [Member]	Dec. 31, 2010 Restricted Common Stock [Member] Equity Plan [Member]	Dec. 31, 2012 Restricted Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2011 Restricted Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2010 Restricted Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2012 Restricted Unvested Common Stock [Member] Equity Plan [Member]	Dec. 31, 2011 Restricted Unvested Common Stock [Member] Equity Plan [Member]	Sep. 30, 2012 Restricted Unvested Common Stock [Member] Equity Plan [Member]	Dec. 31, 2010 Restricted Unvested Common Stock [Member] Equity Plan [Member]	Dec. 31, 2012 Restricted Unvested Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2011 Restricted Unvested Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2010 Restricted Unvested Common Stock [Member] Director Stock Plan [Member]	Feb. 28, 2013 Performance Shares [Member] Outperformance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Periodic Vesting Percentage										20.00%														33.30%
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number										11,400	259,909	167,400	0	13,200	9,000	0		153,450	186,403	0		9,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price											$ 11.84	$ 12.50	$ 0.00	$ 12.30	$ 12.50	$ 0.00	$ 11.62	$ 12.50		$ 0.00	$ 12.27	$ 12.50	$ 0.00
Shares issued in lieu of cash for services, in shares								325,000	167,400
Share-based compensation	$ 0	$ 1,170	$ 182	$ 100	$ 200	$ 1,200
Maximum authorized amount as a percentage of shares authorized							10.00%
Number of shares authorized, in shares										99,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period											93,683	167,400		9,000	9,000		93,683	167,400			9,000	9,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price											$ 10.65	$ 12.50			$ 12.50		$ 10.65	$ 12.50			$ 12.21	$ 12.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period											(1,174)			(4,800)			(1,174)				(4,800)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price											$ 10.65			$ 12.50			$ 10.65				$ 12.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period																	(59,556)	(13,950)			(1,800)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value																	$ 12.42	$ 12.50			$ 12.50	$ 0.00