Derivatives and Hedging Activities (Schedule of Interest Rate Derivatives) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Derivative [Line Items]
Derivative assets, at fair value	$ 9,189	[1]	$ 0	[1]
Derivative liabilities, at fair value	(18,455)	[1]	(3,830)	[1]
Designated as Hedging Instrument [Member] | Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Number of Instruments	16
Derivative, Notional Amount	700,390
Designated as Hedging Instrument [Member] | Derivatives Assets, at Fair Value [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative assets, at fair value	9,189		0
Designated as Hedging Instrument [Member] | Derivative Liabilities, at Fair Value [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative liabilities, at fair value	(1,719)		(3,830)
Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Number of Instruments	1
Derivative, Notional Amount	500,000
Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Liabilities [Member] | Series D Preferred Stock Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities, at fair value	$ (16,736)		$ 0

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