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Fair Value Information for Financial Instruments (Detail) (USD $)
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Jun. 30, 2014
Carrying Value
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Dec. 31, 2013
Carrying Value
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Jun. 30, 2014
Estimated Fair Value
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Dec. 31, 2013
Estimated Fair Value
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Jun. 30, 2014
Convertible Senior Notes
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May 20, 2014
Convertible Senior Notes
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||||||
| Loans receivable, net | $ 113,321,000 | $ 117,721,000 | $ 121,670,000 | $ 131,587,000 | ||||||||
| Revolving credit facilities, net | 15,528,000 | 35,120,000 | 15,711,000 | 34,911,000 | ||||||||
| Mortgages and notes payable, net | 3,202,853,000 | 3,743,098,000 | 3,279,436,000 | 3,892,621,000 | ||||||||
| Convertible senior notes, net (1) | 691,711,000 | [1] | 0 | [1] | 747,066,000 | [1] | 0 | [1] | ||||
| Value of the embedded conversion premium, included in net debt (discount) | $ 55,800,000 | $ 56,700,000 | ||||||||||
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