Unconsolidated Entities - Other Joint Ventures, Investment in and Advances to by Region (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	$ 3,635,214	$ 2,195,782
Other joint ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	176,985	182,702
Other joint ventures [Member] | Americas [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	102,204	106,655
Other joint ventures [Member] | Europe [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	47,069	48,503
Other joint ventures [Member] | Asia [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	$ 27,712	$ 27,544