Share-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended		2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		0 Months Ended	36 Months Ended															25 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2013 Compensation expense, accelerated vesting portion [Member] Restricted Stock [Member]	Jun. 30, 2013 2013 Advisor Multi-Year Outperformance Agreement (OPP) [Domain]	Jun. 30, 2013 2013 Advisor Multi-Year Outperformance Agreement (OPP) [Domain]	Jun. 30, 2013 Restricted Stock [Member] Restricted Share Plan [Member] Manager [Member]	Feb. 28, 2013 Restricted Stock [Member] Restricted Share Plan [Member] ARC Properties Advisors, LLC [Member] Manager [Member]	Sep. 30, 2013 Restricted Stock [Member] Restricted Share Plan [Member] ARC Properties Advisors, LLC [Member] Manager [Member]	Jun. 30, 2013 Restricted Stock [Member] Restricted Share Plan [Member] ARC Properties Advisors, LLC [Member] Manager [Member]	Dec. 31, 2012 Restricted Stock [Member] Restricted Share Plan [Member] ARC Properties Advisors, LLC [Member] Manager [Member]	Dec. 31, 2012 Restricted Stock [Member] Restricted Share Plan [Member]	Jun. 30, 2013 Restricted Stock [Member] Director Stock Plan [Member]	Sep. 30, 2012 Restricted Stock [Member] Director Stock Plan [Member]	Sep. 30, 2013 Restricted Common Stock [Member] Restricted Share Plan [Member]	Jun. 30, 2013 Restricted Common Stock [Member] Restricted Share Plan [Member]	Dec. 31, 2012 Restricted Common Stock [Member] Restricted Share Plan [Member]	Jun. 30, 2013 Restricted Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2012 Restricted Common Stock [Member] Director Stock Plan [Member]	Jun. 30, 2013 Restricted Unvested Common Stock [Member] Restricted Share Plan [Member]	Dec. 31, 2012 Restricted Unvested Common Stock [Member] Restricted Share Plan [Member]	Jun. 30, 2013 Restricted Unvested Common Stock [Member] Director Stock Plan [Member]	Dec. 31, 2012 Restricted Unvested Common Stock [Member] Director Stock Plan [Member]	Feb. 28, 2013 Performance Shares [Member] Outperformance Plan [Member]	Dec. 15, 2015 Performance Shares [Member] Outperformance Plan [Member]	Jun. 30, 2013 Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Excess Return, Above Threshold [Member] Absolute Component [Member] Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Excess Return, Above Threshold [Member] Absolute Component [Member] Performance Shares [Member] Outperformance Plan [Member] Maximum [Member]	Feb. 28, 2013 Excess Return, Above Peer Group [Member] Relative Component [Member] Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Cumulative Return, Above Threshold [Member] Relative Component [Member] Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Cumulative Return, Above Threshold [Member] Relative Component [Member] Performance Shares [Member] Outperformance Plan [Member] Maximum [Member]	Feb. 28, 2013 Cumulative Return, Above Threshold [Member] Relative Component [Member] Performance Shares [Member] Outperformance Plan [Member] Minimum [Member]	Feb. 28, 2013 Cumulative Return, Above Threshold [Member] Relative Component, Linear Interpolation [Member] Performance Shares [Member] Outperformance Plan [Member] Maximum [Member]	Feb. 28, 2013 Cumulative Return, Equal to Threshold [Member] Relative Component [Member] Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Cumulative Return, Equal to Threshold [Member] Relative Component, Linear Interpolation [Member] Performance Shares [Member] Outperformance Plan [Member] Minimum [Member]	Feb. 28, 2013 Cumulative Return, Below Threshold [Member] Relative Component [Member] Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Equity Market Capitalization [Member] Performance Shares [Member] Outperformance Plan [Member]	Feb. 28, 2013 Equity Market Capitalization [Member] Performance Shares [Member] Outperformance Plan [Member] Maximum [Member]	Feb. 28, 2013 Stockholder's Book Equity [Member] Performance Shares [Member]	Jan. 15, 2018 OP Units [Member] Outperformance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum authorized amount as a percentage of shares authorized												10.00%
Shares issued in lieu of cash for services, in shares																167,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period													325,000	300,000	325,000								18,000		325,000		18,000		8,241,101
Restricted share vesting period																		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Periodic Vesting Percentage																			20.00%
Number of shares authorized, in shares																		99,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Automatic Grant																	3,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number																		18,000			584,909	259,909	48,300	30,300	325,000	186,403		27,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price																					$ 12.95	$ 11.84	$ 12.13	$ 10.68	$ 13.83	$ 11.62	$ 14.58	$ 10.58
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price																				$ 14.80	$ 13.88				$ 13.83		$ 14.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period																									(186,403)		(27,930)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value																									$ (11.62)		$ (10.58)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period																					0		0		0		0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price																					$ 0.00		$ 0.00		$ 0.00		$ 0.00
Equity-based compensation	$ 3,454,000	$ 178,000	$ 4,330,000	$ 324,000	$ 200,000	$ 200,000	$ 600,000	$ 400,000	$ 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Market Capitalization Threshold																																4.00%		4.00%								5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Awarded as a Percentage of Maximum																																			100.00%				50.00%		0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Return Percentage Threshold																																7.00%	21.00%			18.00%	6.00%	6.00%	0.00%	0.00%
Equity Capitalization, Including Portion Attributable to Noncontrolling Interest, Aggregate Gross Capitalization																																												2,100,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period																														3 years
Share-based Compensation Arrangement by Share-based Payment Award, Shares Authorized, Percentage of Benchmark, Shares Committed Annually																																											1.25%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Authorized, Percentage of Benchmark, Potential Share Commitment																																											3.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Allocated as a Percentage of Shares Authorized																															100.00%
Percentage of Shares Allowable to be Converted, Percentage																																													33.30%
Equity-based compensation			$ 6,708,000	$ 330,000						$ 3,100,000	$ 3,700,000