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Unconsolidated Entities - Earnings on Investment in Co-Investment Ventures (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]        
Gain on sale of property $ 26,365 $ 2,563 $ 59,554 $ 20,447
Brazil Fund [Member]
       
Schedule of Equity Method Investments [Line Items]        
Gain on sale of property $ 1,200   $ 10,000  
Number of Properties sold 1   3