Preferred and Common Stock (Detail) (USD $)	0 Months Ended			3 Months Ended				5 Months Ended		10 Months Ended	0 Months Ended
	Mar. 31, 2014		Oct. 24, 2013	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Oct. 22, 2013	Nov. 08, 2013	Jan. 03, 2014	Dec. 31, 2013		Sep. 15, 2013	Aug. 21, 2013	Aug. 01, 2012	Feb. 28, 2013
Class of Stock [Line Items]
Common stock, par value	$ 0.01	[1]		$ 0.01	[1]	$ 0.01		$ 0.01	[1]				$ 0.01	[1]	$ 0.01
Proceeds from issuances of common stock				$ 0	[1]	$ 1,317,389,000	[1]
Loss on derivative instruments, net				(7,121,000)	[1]	(5,000)	[1]
Common stock, shares authorized	1,500,000,000	[1]		1,500,000,000	[1]	240,000,000		1,500,000,000	[1]				750,000,000	[1]
Maximum Amount of Offering from Universal Shelf Registration Statement																	500,000,000
Authorized annual dividends, per share	$ 1.00		$ 1.00							$ 0.94
Authorized annual dividends increase (decrease), per share								$ 0.06
Stock Repurchase Program, Authorized Amount																250,000,000
Series D preferred stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value	$ 0.01	[1]		$ 0.01	[1]			$ 0.01	[1]				$ 0.01	[1]	$ 0.01
Shares to be Issued											21,700,000
Proceeds from issuances of preferred shares											288,000,000
Preferred stock, dividend rate, percentage											5.81%
Preferred Stock, Redemption Price Per Share											$ 13.59
Dividends declared, in dollars per share											$ 0.79
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			26,700,000				26,700,000					16,700,000		18,700,000
Loss on derivative instruments, net				10,000,000
Convertible preferred stock															269,300,000
Preferred stock, issued	21,735,008	[1]		21,735,008	[1]			21,735,008	[1]				21,735,008	[1]
Preferred stock, outstanding	21,735,008	[1]		21,735,008	[1]			21,735,008	[1]				21,735,008	[1]
Series F Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Redemption Price Per Share	$ 25.00			$ 25.00				$ 25.00
Dividends declared, in dollars per share				$ 1.675
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number	42,654,919			42,654,919				42,654,919
Percentage of Stock, Designated Cumulative Preferred Stock												6.70%
Common Stock [Member]
Class of Stock [Line Items]
Shares to be Issued											15,100,000
Proceeds from issuances of common stock											186,000,000
ARCT IV / ARCP Merger [Member] | Series F Preferred Stock [Member]
Class of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares												42,200,000
ARCT IV / ARCP Merger [Member] | Series F OP Units [Member]
Class of Stock [Line Items]
Preferred stock, issued	266,093			266,093				266,093
Preferred stock, outstanding	266,093			266,093				266,093
ARCT IV / ARCP Merger [Member] | Series F OP Units [Member] | ARCP IV [Member]
Class of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares												700,000
ARCT IV / ARCP Merger [Member] | Common Stock [Member]
Class of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares												36,900,000
ARCT III [Member]
Class of Stock [Line Items]
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
Registration Payment Arrangement Arrangement [Member]
Class of Stock [Line Items]
Common stock, shares authorized	1,882,248			1,882,248				1,882,248
At the Market Offering [Member]
Class of Stock [Line Items]
Maximum Amount of Offering from Universal Shelf Registration Statement	$ 60,000,000			$ 60,000,000				$ 60,000,000
Preferred Stock [Member] | Op Units [Member] | ARCP IV [Member]
Class of Stock [Line Items]
Conversion of OP units to series F preferred stock, shares				455,372
Common Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)				524,305,318	[1]	32,689,878	[1]
Common Stock [Member] | Shares Issued under the universal shelf registration
Class of Stock [Line Items]
Shares issued (in shares)				2,100,000

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