Restated Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Real estate investments, at cost:
Land	$ 1,380,308	[1]	$ 262,906	[1]
Buildings, fixtures and improvements	5,297,400	[1]	1,391,209	[1]
Land and construction in progress	21,839	[1]	0	[1]
Acquired intangible lease assets	759,595	[1]	221,500	[1]
Total real estate investments, at cost	7,459,142	[1]	1,875,615	[1]
Less: accumulated depreciation and amortization	(267,278)	[1]	(56,524)	[1]
Total real estate investments, net	7,191,864	[1]	1,819,091	[1]
Cash and cash equivalents	52,725	[1]	292,575	[1]	19,331	[1]	0
Investment in direct financing leases, net	66,112	[1]	0	[1]
Investment securities, at fair value	62,067	[1]	41,654	[1]
Loans held for investment, net	26,279	[1]	0	[1]
Derivative assets, at fair value	9,189	[1]	0	[1]
Restricted cash	35,921	[1]	1,108	[1]
Prepaid expenses and other assets, net	186,726	[1],[2]	11,984	[1]
Goodwill	92,789
Deferred costs, net	84,746	[1]	15,118	[1]
Assets held for sale	665	[1]	665	[1]
Total assets	7,809,083	[1]	2,182,195	[1]
LIABILITIES AND EQUITY
Mortgage notes payable, net	1,301,114	[1]	265,118	[1]
Convertible debt, net	972,490	[1]	0	[1]
Other debt	104,804	[1]	0	[1]
Below-market lease liabilities, net	77,169	[1]	0	[1]
Derivative liabilities, at fair value	18,455	[1]	3,830	[1]
Accounts payable and accrued expenses	730,571	[1]	102,740	[1]
Deferred rent and other liabilities	21,816	[1]	4,516	[1]
Distributions payable	10,903	[1]	11,105	[1]
Due to affiliates	103,434	[1],[3]	1,522	[1]
Total liabilities	5,310,556	[1]	513,435	[1]
Common stock, $0.01 par value, 1,500,000,000 shares authorized and 239,234,725 issued and outstanding at December 31, 2013	2,392	[1]	1,846	[1]
Additional paid-in capital	2,940,907	[1]	1,778,883	[1]
Accumulated other comprehensive income (loss)	7,666	[1]	(3,934)	[1]
Accumulated deficit	(877,957)	[1]	(124,286)	[1]
Total stockholders' equity	2,073,430	[1]	1,652,579	[1]
Non-controlling interests	155,798	[1]	16,181	[1]
Total equity	2,229,228	[1]	1,668,760	[1]
Total liabilities and equity	7,809,083	[1]	2,182,195	[1]
Unsecured Debt [Member]
LIABILITIES AND EQUITY
Credit facilities	1,819,800	[1]	0	[1]
Senior Secured Credit Facility [Member]
LIABILITIES AND EQUITY
Credit facilities	150,000	[1]	0	[1]
Series D preferred stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	269,299	[1]	0	[1]
Convertible Preferred Stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	422	[1]	70	[1]
As Previously Reported [Member]
Real estate investments, at cost:
Land	1,379,453	[4]
Buildings, fixtures and improvements	5,291,031	[4]
Land and construction in progress	21,839	[4]
Acquired intangible lease assets	758,376	[4]
Total real estate investments, at cost	7,450,699	[4]
Less: accumulated depreciation and amortization	(267,352)	[4]
Total real estate investments, net	7,183,347	[4]
Cash and cash equivalents	52,725	[4]	292,575	[4]
Investment in direct financing leases, net	66,112	[4]
Investment securities, at fair value	62,067	[4]
Loans held for investment, net	26,279	[4]
Derivative assets, at fair value	9,189	[4]
Restricted cash	35,921	[4]
Prepaid expenses and other assets, net	187,930	[2],[4]
Goodwill	102,419	[4]
Deferred costs, net	81,311	[4]
Assets held for sale	679	[4]
Total assets	7,807,979	[4]
LIABILITIES AND EQUITY
Mortgage notes payable, net	1,301,114	[4]
Convertible debt, net	972,490	[4]
Other debt	104,804	[4]
Below-market lease liabilities, net	77,789	[4]
Derivative liabilities, at fair value	18,455	[4]
Accounts payable and accrued expenses	808,900	[4]
Deferred rent and other liabilities	21,816	[4]
Distributions payable	10,278	[4]
Due to affiliates	0	[3],[4]
Total liabilities	5,285,446	[4]
Common stock, $0.01 par value, 1,500,000,000 shares authorized and 239,234,725 issued and outstanding at December 31, 2013	2,392	[4]
Additional paid-in capital	2,939,287	[4]
Accumulated other comprehensive income (loss)	7,666	[4]
Accumulated deficit	(864,516)	[4]	(124,570)	[5]
Total stockholders' equity	2,085,251	[4]	1,652,295	[5]
Non-controlling interests	167,983	[4]	16,465	[5]
Total equity	2,253,234	[4]	1,668,760	[5]
Total liabilities and equity	7,807,979	[4]
As Previously Reported [Member] | Unsecured Debt [Member]
LIABILITIES AND EQUITY
Credit facilities	1,819,800	[4]
As Previously Reported [Member] | Senior Secured Credit Facility [Member]
LIABILITIES AND EQUITY
Credit facilities	150,000	[4]
As Previously Reported [Member] | Series D preferred stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	269,299	[4]
As Previously Reported [Member] | Convertible Preferred Stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	422	[4]
Error Corrections [Member]
Real estate investments, at cost:
Land	855
Buildings, fixtures and improvements	6,369
Land and construction in progress	0
Acquired intangible lease assets	837
Total real estate investments, at cost	8,061
Less: accumulated depreciation and amortization	229
Total real estate investments, net	8,290
Cash and cash equivalents	0		0
Investment in direct financing leases, net	0
Investment securities, at fair value	0
Loans held for investment, net	0
Derivative assets, at fair value	0
Restricted cash	0
Prepaid expenses and other assets, net	(1,204)	[2]
Goodwill	(9,630)
Deferred costs, net	3,662
Assets held for sale	(14)
Total assets	1,104
LIABILITIES AND EQUITY
Mortgage notes payable, net	0
Convertible debt, net	0
Other debt	0
Below-market lease liabilities, net	(620)
Derivative liabilities, at fair value	0
Accounts payable and accrued expenses	(78,329)
Deferred rent and other liabilities	0
Distributions payable	625
Due to affiliates	103,434	[3]
Total liabilities	25,110
Common stock, $0.01 par value, 1,500,000,000 shares authorized and 239,234,725 issued and outstanding at December 31, 2013	0
Additional paid-in capital	1,620
Accumulated other comprehensive income (loss)	0
Accumulated deficit	(13,441)		284
Total stockholders' equity	(11,821)		284
Non-controlling interests	(12,185)		(284)
Total equity	(24,006)		0
Total liabilities and equity	1,104
Error Corrections [Member] | Unsecured Debt [Member]
LIABILITIES AND EQUITY
Credit facilities	0
Error Corrections [Member] | Senior Secured Credit Facility [Member]
LIABILITIES AND EQUITY
Credit facilities	0
Error Corrections [Member] | Series D preferred stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	0
Error Corrections [Member] | Convertible Preferred Stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	0
Reclassifications And Immaterial Adjustments [Member]
Real estate investments, at cost:
Land	0
Buildings, fixtures and improvements	0
Land and construction in progress	0
Acquired intangible lease assets	382
Total real estate investments, at cost	382
Less: accumulated depreciation and amortization	(155)
Total real estate investments, net	227
Cash and cash equivalents	0		0
Investment in direct financing leases, net	0
Investment securities, at fair value	0
Loans held for investment, net	0
Derivative assets, at fair value	0
Restricted cash	0
Prepaid expenses and other assets, net	0	[2]
Goodwill	0
Deferred costs, net	(227)
Assets held for sale	0
Total assets	0
LIABILITIES AND EQUITY
Mortgage notes payable, net	0
Convertible debt, net	0
Other debt	0
Below-market lease liabilities, net	0
Derivative liabilities, at fair value	0
Accounts payable and accrued expenses	0
Deferred rent and other liabilities	0
Distributions payable	0
Due to affiliates	0	[3]
Total liabilities	0
Common stock, $0.01 par value, 1,500,000,000 shares authorized and 239,234,725 issued and outstanding at December 31, 2013	0
Additional paid-in capital	0
Accumulated other comprehensive income (loss)	0
Accumulated deficit	0
Total stockholders' equity	0
Non-controlling interests	0
Total equity	0
Total liabilities and equity	0
Reclassifications And Immaterial Adjustments [Member] | Unsecured Debt [Member]
LIABILITIES AND EQUITY
Credit facilities	0
Reclassifications And Immaterial Adjustments [Member] | Senior Secured Credit Facility [Member]
LIABILITIES AND EQUITY
Credit facilities	0
Reclassifications And Immaterial Adjustments [Member] | Series D preferred stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	0
Reclassifications And Immaterial Adjustments [Member] | Convertible Preferred Stock [Member]
LIABILITIES AND EQUITY
Convertible preferred stock	$ 0

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

[2] Certain line item captions have been updated since the recasted filing, which applied the carryover basis of accounting to include the effects of the merger with ARCT IV. This line item caption has been updated to prepaid expenses and other assets, net in the accompanying consolidated balance sheets.

[3] This line item caption has been added and is included in the accompanying consolidated balance sheets.

[4] These financial statements have been recast in applying the carryover basis of accounting to include the effects of the merger with ARCT IV.

[5] These financial figures have been recast in applying the carryover basis of accounting to include the effects of the merger with ARCT IV.