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Borrowings (Total Obligations Under The Convertible Senior Notes Due 2013) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Borrowings [Line Items]    
Senior Notes $ 1,262,087 [1] $ 1,250,758 [1]
Convertible Senior Notes Due 2013 [Member]
   
Borrowings [Line Items]    
Senior Notes 303,372 299,122
Convertible Debt [Member] | Convertible Senior Notes Due 2013 [Member]
   
Borrowings [Line Items]    
Senior Notes 310,000 310,000
Unamortized debt discount (1,291) (2,311)
Debt discount related to ASC 470-20 $ (5,337) $ (8,567)
[1] Restated