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Unconsolidated Entities - Earnings on Investment in Co-Investment Ventures (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Brazil Fund [Member]
Property
Schedule of Equity Method Investments [Line Items]          
Gain on sale of property $ 8,421 $ 3,889 $ 33,189 $ 17,884 $ 8,700
Number of Properties sold         2