Unconsolidated Entities (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other joint ventures, investment in and advances to entities
Investments in and advances to unconsolidated entities	$ 2,220,172	$ 2,857,755
Other joint ventures [Member]
Other joint ventures, investment in and advances to entities
Investments in and advances to unconsolidated entities	276,329	386,576
Other joint ventures [Member] | Americas [Member]
Other joint ventures, investment in and advances to entities
Investments in and advances to unconsolidated entities	196,366	305,352
Other joint ventures [Member] | Europe [Member]
Other joint ventures, investment in and advances to entities
Investments in and advances to unconsolidated entities	50,237	50,474
Other joint ventures [Member] | Asia [Member]
Other joint ventures, investment in and advances to entities
Investments in and advances to unconsolidated entities	$ 29,726	$ 30,750