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Debt (Details Textual)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||
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Jun. 30, 2012
USD ($)
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Jun. 30, 2012
USD ($)
Y
Property
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Jun. 30, 2012
JPY (¥)
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Mar. 31, 2012
USD ($)
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Dec. 31, 2011
USD ($)
Property
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Jun. 30, 2012
Maximum [Member]
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Jun. 30, 2012
Minimum [Member]
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Jun. 30, 2012
TMK bonds due March 2012 at 0.00% [Member]
JPY (¥)
Property
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Jun. 30, 2012
Senior Term Loan [Member]
USD ($)
Loans
Period
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Jun. 30, 2012
Senior Term Loan [Member]
EUR (€)
Loans
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Jun. 30, 2012
Mortgage Debt [Member]
USD ($)
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Jun. 30, 2012
Mortgage Debt [Member]
JPY (¥)
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Jun. 30, 2012
Secured Mortgage Debt of Consolidated Entities [Member]
Property
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Jun. 20, 2012
Secured Mortgage Debt of Consolidated Entities [Member]
USD ($)
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Jun. 20, 2012
Secured Mortgage Debt Of Consolidated Entities Due 2016 [Member]
USD ($)
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Jun. 20, 2012
Secured Mortgage Debt of Consolidated Entities Due 2018 [Member]
USD ($)
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Jun. 30, 2012
Secured mortgage debt [Member]
Maximum [Member]
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Jun. 30, 2012
Secured mortgage debt [Member]
Minimum [Member]
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| Senior and Other Notes Convertible Notes and Secured Mortgage Debt [Line Items] | ||||||||||||||||||
| Number of properties secured in mortgage notes | 24 | 8 | 4 | |||||||||||||||
| Interest Rate of Bonds Issued | 1.40% | 0.80% | ||||||||||||||||
| Value of bonds issued | $ 447,000,000 | $ 447,000,000 | ¥ 35,600,000,000 | |||||||||||||||
| Purchased debt securitized by properties | 12 | 90 | ||||||||||||||||
| Aggregate lender - commitments | 2,146,600,000 | 2,146,600,000 | 619,300,000 | 487,500,000 | ||||||||||||||
| Increased borrowing limit | 1,300,000,000 | 987,500,000 | ||||||||||||||||
| Term loans assumed | 2 | 2 | ||||||||||||||||
| Period for extension | up to one year | up to one year | ||||||||||||||||
| Number of extensions to maturity period | 3 | 3 | ||||||||||||||||
| Increase in value of bonds | 156,500,000 | 12,400,000,000 | ||||||||||||||||
| Prior interest rate of bonds issued | 3.95% | 1.80% | ||||||||||||||||
| Reduced interest rate of bonds issued | 1.80% | 1.00% | ||||||||||||||||
| Principal Amount | 23,000,000 | 13,000,000 | 10,000,000 | |||||||||||||||
| Interest rate of secured mortgage debt of consolidated entities | 4.50% | 4.78% | ||||||||||||||||
| Unsecured credit facilities included in maturities | 14,100,000 | 14,100,000 | ||||||||||||||||
| Undepreciated value of properties securing bonds | 799,200,000 | 799,200,000 | ||||||||||||||||
| Undepreciated value of properties securing debt | 40,600,000 | |||||||||||||||||
| Debt (Textual) [Abstract] | ||||||||||||||||||
| Weighted average coupon interest rate | 2.80% | 2.80% | 2.60% | |||||||||||||||
| Global credit facility borrowing limit | 1,710,000,000 | 1,710,000,000 | ||||||||||||||||
| Potential future global credit facility borrowing limit | 2,750,000,000 | 2,750,000,000 | ||||||||||||||||
| Cross acceleration included in defaults | 50,000,000 | 50,000,000 | ||||||||||||||||
| Debt revolver borrowing amount | 459,000,000 | 459,000,000 | 36,500,000,000 | |||||||||||||||
| Potential future debt revolver borrowing amount | 710,000,000 | 710,000,000 | 56,500,000,000 | |||||||||||||||
| Fair value of derivative instruments | 29,900,000 | 29,900,000 | 17,500,000 | |||||||||||||||
| Foreign currency exchange gain loss | 14,400,000 | (12,400,000) | ||||||||||||||||
| Mortgage notes acquired in merger decrease for the period | 720,200,000 | |||||||||||||||||
| Additional mortgage notes acquired in merger | 150,000,000 | |||||||||||||||||
| Undepreciated value of properties securing mortgage notes | 318,800,000 | 318,800,000 | ||||||||||||||||
| Undepreciated value of properties securing debt acquired in merger | 1,100,000,000 | 1,100,000,000 | ||||||||||||||||
| Mortgage notes acquired in merger | 875,400,000 | |||||||||||||||||
| Principal payment period of consolidated debt | 10 | |||||||||||||||||
| Secured mortgage debt | 28,100,000 | 28,100,000 | ||||||||||||||||
| Amount of exchangeable notes paid off | 448,900,000 | |||||||||||||||||
| Senior unsecured notes repaid | $ 58,900,000 | |||||||||||||||||