Consolidated Statements of Operations (Parenthetical) (Affiliated Entity [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related party expenses	$ 203,558,000	$ 0	$ 0
Acquisition-related Costs [Member]
Related party expenses	1,652,000	37,564,000	28,656,000
Merger And Other Non-Routine Transactions [Member]
Related party expenses	137,778,000	156,146,000	0
General and Administrative Expense [Member]
Related party expenses	16,089,000	103,206,000	826,000
ARC Properties Operating Partnership, L.P. [Member] | Acquisition-related Costs [Member]
Related party expenses	1,652,000	37,564,000	28,656,000
ARC Properties Operating Partnership, L.P. [Member] | Merger And Other Non-Routine Transactions [Member]
Related party expenses	137,778,000	156,146,000	0
ARC Properties Operating Partnership, L.P. [Member] | General and Administrative Expense [Member]
Related party expenses	$ 16,089,000	$ 103,206,000	$ 168,000