Mortgage Note Payable (Schedule of Mortgage Notes Payable) (Detail) (USD $)	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Debt Instrument [Line Items]
Outstanding Loan Amount	$ 3,782,407,000		$ 272,015,000		$ 3,782,407,000		$ 272,015,000		1,301,114,000	[1]
Mortgage notes held for sale	542,800,000				542,800,000
Loss on derivative instruments, net	(17,484,000)		(38,651,000)	[1]	(10,398,000)		(69,830,000)	[1]
Gain (loss) of deferred debt issuance cost					14,637,000		0	[1]
Mortgages [Member]
Debt Instrument [Line Items]
Encumbered Properties	806	[2]			806	[2]			177
Outstanding Loan Amount	4,237,464,000	[2]			4,237,464,000	[2]			1,258,661,000
Weighted Average Effective Interest Rate	4.80%	[2],[3]			4.80%	[2],[3]			3.42%	[3]
Unamortized discount (premium), net	(87,800,000)				(87,800,000)
Extinguishment of debt, amount	173,300,000				1,000,000,000
Payments for prepayments fees	3,000,000				35,900,000
Gain (loss) of deferred debt issuance cost	1,900,000				18,900,000
Mortgages [Member] | CapLease [Member]
Debt Instrument [Line Items]
Unamortized discount (premium), net	(137,400,000)				(137,400,000)
Mortgages [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity					6 years 3 months 7 days	[2],[4]			3 years 4 months 28 days	[4]
Mortgages [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate	2.43%				2.43%				1.83%
Mortgages [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate	7.20%				7.20%				6.28%
Mortgages [Member] | Mortgages One [Member]
Debt Instrument [Line Items]
Weighted Average Effective Interest Rate	5.00%				5.00%
Mortgages [Member] | Mortgages One [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity					2 years 5 months 12 days
Mortgages [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Loss on derivative instruments, net	$ 100,000				$ 10,200,000

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

[2] Includes $542.8 million of mortgage notes held for sale.

[3] Mortgage notes payable primarily have fixed rates or are fixed by way of interest rate swap arrangements. Effective interest rates range from 2.43% to 7.20% at September 30, 2014 and 1.83% to 6.28% at December 31, 2013.

[4] Weighted average remaining years until maturity as of September 30, 2014 and December 31, 2013, respectively.