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Components of Long-Term Debt and Capital Lease Obligations (Parenthetical) (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2012
7 3/4 % Senior Notes Due 2016
Dec. 31, 2012
6 3/4 % Senior Notes Due 2020
Dec. 31, 2012
6.0% Senior Notes Due 2022
Nov. 27, 2012
6.0% Senior Notes Due 2022
Dec. 31, 2012
3 3/4% Senior Subordinated Convertible Notes Due 2012
Dec. 31, 2011
3 3/4% Senior Subordinated Convertible Notes Due 2012
Dec. 31, 2011
Senior Notes
Long-Term Debt And Capital Lease Obligations [Line Items]                
Interest percentage   7.75% 6.75% 6.00% 6.00% 3.75%    
Debt maturity period   2016 2020 2022 2022 2012    
Principal amount of notes $ 723,000,000       $ 300,000,000   $ 149,900,000 $ 215,000,000
Senior notes, unamortized gain               5,600,000
Principal amount of convertible notes, discount amount             $ 3,100,000