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