Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	$ 62,067	[1]	$ 41,654	[1]
Net Amounts of Assets Presented in the Consolidated Balance Sheets	9,189		0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	18,455		3,830
Derivative assets, at fair value	9,189	[1]	0	[1]
Loans held for investment, net	26,279	[1]	0	[1]
Senior secured revolving credit facility	0	[1]	124,604	[1]
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	4,348,208		389,722
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Convertible Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for investment, net	26,279		0
Senior secured revolving credit facility	972,490		0
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	1,301,114		265,118
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Secured Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	150,000		0
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Secured Credit Facility [Member] | Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	0		124,604
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Unsecured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	1,819,800		0
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	1,100,000
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	26,548		0
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	58,979		0
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	19,277		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	4,353,996		395,660
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Convertible Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for investment, net	26,435		0
Senior secured revolving credit facility	976,629		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Mortgages [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	1,305,823		271,056
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Senior Secured Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	150,000		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Senior Secured Credit Facility [Member] | Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	0		124,604
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Unsecured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	1,819,800		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	23,345		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	59,049		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Other Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured revolving credit facility	19,350		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		41,654
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	8,954		(3,830)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	43,847		0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	52,801		37,824
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	1,484
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	1,484
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	60,583
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value	60,583
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheets	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheets	9,189
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(1,719)		(3,830)
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheets	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheets	9,189
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(1,719)		(3,830)
Fair Value, Measurements, Recurring [Member] | Series D Preferred Stock Embedded Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets, at fair value	0
Fair Value, Measurements, Recurring [Member] | Series D Preferred Stock Embedded Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets, at fair value	0
Fair Value, Measurements, Recurring [Member] | Series D Preferred Stock Embedded Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets, at fair value	(16,736)
Fair Value, Measurements, Recurring [Member] | Series D Preferred Stock Embedded Derivative [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets, at fair value	(16,736)
Fair Value, Measurements, Recurring [Member] | Preferred Stock And Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value			41,654
Fair Value, Measurements, Recurring [Member] | Preferred Stock And Senior Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value			0
Fair Value, Measurements, Recurring [Member] | Preferred Stock And Senior Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value			0
Fair Value, Measurements, Recurring [Member] | Preferred Stock And Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities, at fair value			$ 41,654

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