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Components Of Long-Term Debt And Capital Lease Obligations (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Long-Term Debt And Capital Lease Obligations [Line Items]    
Principal amount of notes $ 718.0 $ 815.0
7 3/4 % Senior Notes Due 2016
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Interest percentage 7.75%  
Debt maturity period 2016  
6 3/4 % Senior Notes Due 2020
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Interest percentage 6.75%  
Debt maturity period 2020  
3 3/4% Senior Subordinated Convertible Notes Due 2012
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Interest percentage 3.75%  
Debt maturity period 2012  
Principal amount of notes   149.9
Principal amount of convertible notes, discount amount   3.1
Senior Notes
   
Long-Term Debt And Capital Lease Obligations [Line Items]    
Principal amount of notes 215.0  
Senior notes, premium amount $ 4.8 $ 5.6