Equity Method Investments In Affiliates (Investments In Unconsolidated Affiliates) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates, Total Carrying value	$ 0	[1]	$ 243,010	[1]
Equity-Accounted Affiliate [Member] | Whitehall Group [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates, Total Carrying value	$ 0		$ 243,010	[1]

[1] Restated