Preferred and Common Stock (Details) (USD $)	0 Months Ended	3 Months Ended		5 Months Ended	10 Months Ended							3 Months Ended			0 Months Ended	3 Months Ended			0 Months Ended		3 Months Ended	0 Months Ended		0 Months Ended
	Aug. 21, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Oct. 22, 2013	Dec. 31, 2013	Sep. 15, 2013	Jul. 02, 2013	Mar. 31, 2014 At the Market Offering [Member]	Mar. 31, 2014 Registration Payment Arrangement, Arrangement [Domain]	Feb. 28, 2013 ARCT III [Member]	Mar. 31, 2014 Common Stock [Member]	Mar. 31, 2014 Common Stock [Member] Shares Issued Under the Universal Shelf Registration [Member]	Mar. 31, 2014 OP Units [Member] Convertible Preferred Stock	Nov. 08, 2013 Series D preferred stock	Mar. 31, 2014 Series D preferred stock	Dec. 31, 2013 Series D preferred stock	Sep. 15, 2013 Series D preferred stock	Nov. 08, 2013 Common Stock [Member]	Jan. 03, 2014 Common Stock [Member] ARCT IV / ARCP Merger [Member]	Mar. 31, 2014 Series F Preferred Stock [Member]	Jan. 03, 2014 Series F Preferred Stock [Member] ARCT IV / ARCP Merger [Member]	Mar. 31, 2014 Series F OP Units [Member]	Jan. 03, 2014 ARCP IV [Member] OP Units [Member] ARCT IV / ARCP Merger [Member]	Jan. 03, 2014 ARCP IV [Member] Series F OP Units [Member] ARCT IV / ARCP Merger [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value																$ 0.01	$ 0.01	$ 0.01
Common stock, par value		$ 0.01		$ 0.01		$ 0.01	$ 0.01
Shares to be Issued															21,700,000				15,100,000
Proceeds from issuances of preferred shares															$ 288,000,000
Proceeds from issuances of common stock		0	1,317,389,000																186,000,000
Preferred stock, dividend rate, percentage															5.81%
Preferred stock, redemption price per share															$ 13.59						$ 25.00
Dividends declared, in dollars per share															$ 0.79						$ 1.675
Preferred stock, liquidation preference per share															$ 13.59
Preferred stock, liquidation preference, additional premium															20.00%
Preferred stock, redemption terms, liquidation preference, percent															102.00%
Preferred stock, redemption terms, volume weighted average price, percent															102.00%
Preferred stock, conversion terms, volume weighted average price of common stock															2.00%
Preferred stock, conversion terms, discount on closing price on conversion election date, percentage															2.00%
Preferred stock, conversion terms, volume weighted average price, percent															102.00%
Embedded derivative, fair value of embedded derivative, net																26,700,000	16,700,000	18,700,000
Loss on derivative instruments, net		(20,197,000)	(5,000)													10,000,000
Preferred stock, fair value																		269,300,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number																21,735,008					42,654,919.000
Business acquisition, equity interest issued or issuable, number of shares																				36,900,000		42,200,000		600,000	700,000
Conversion of OP units to series F preferred stock, shares														455,372
Preferred stock, issued																21,735,008	21,735,008						266,093
Preferred stock, outstanding																21,735,008	21,735,008						266,000
Percentage of stock, designated cumulative preferred stock																					6.70%	6.70%
Common stock, shares authorized		750,000,000		750,000,000		750,000,000		1,500,000,000		1,882,248
Maximum amount of offering from universal shelf registration statement		500,000,000		500,000,000					60,000,000
Shares issued (in shares)												524,305,318	2,100,000
Authorized annual dividends, per share		$ 1.000		$ 1.00	$ 0.94
Authorized annual dividends increase (decrease), per share				$ 0.06
Stock repurchase program, authorized amount	$ 250,000,000
Business combination, recognized identifiable assets acquired, goodwill, and liabilities assumed, shares paid in cash											29,200,000
Percentage of total outstanding shares											16.50%
Business acquisition, share price											$ 12.00
Shares based on exchange ratio											27,700,000
Business combination, recognized identifiable assets acquired, goodwill, and liabilities assumed, shares exchanged for shares											148,100,000
Common stock outstanding after share exchange											140,700,000