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Redemption Prices (Detail)
Dec. 31, 2013
7.875% Senior Notes due 2018
 
Debt Instrument [Line Items]  
2014 103.938%
2015 101.969%
2016 100.00%
2017 100.00%
2018 and thereafter 100.00%
8.125% Senior Notes due 2020
 
Debt Instrument [Line Items]  
2015 104.063%
2016 102.708%
2017 101.354%
2018 and thereafter 100.00%
4.75% Senior Notes due 2023
 
Debt Instrument [Line Items]  
2018 102.375%
2019 101.583%
2020 100.792%
2021 and thereafter 100.00%