Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Parenthetical) (Detail)

v2.4.0.8
Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Parenthetical) (Detail)
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
9.0% Senior Subordinated Notes due 2018 [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated Interest rate on debt agreement 9.00% 9.00% 9.00%
7.0% Senior Subordinated Notes due 2022 [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated Interest rate on debt agreement 7.00%   7.00%
5.0% Senior Subordinated Notes due 2023 [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated Interest rate on debt agreement 5.00%   5.00%