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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value $ 3,194,784 $ 4,301,083
9.875% Senior Notes due 2016
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 0 [1] 356,657 [1]
8.0% Senior Notes due 2018
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 0 750,000
8.75% Senior Notes due 2020
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 444,580 [2] 444,127 [2]
7.5% Senior Notes due 2021
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 1,179,027 [3] 1,179,328 [3]
8.125% Senior Notes due 2022
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 750,000 750,000
7.5% Senior Notes due 2023
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 821,177 [4] 820,971 [4]
Fair Value Measurements Level 2 | 9.875% Senior Notes due 2016
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 0 [1] 392,913 [1]
Fair Value Measurements Level 2 | 8.0% Senior Notes due 2018
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 0 790,313
Fair Value Measurements Level 2 | 8.75% Senior Notes due 2020
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 477,000 [2] 490,500 [2]
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2021
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 1,198,500 [3] 1,257,250 [3]
Fair Value Measurements Level 2 | 8.125% Senior Notes due 2022
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 766,875 823,125
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2023
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value $ 829,125 [4] $ 882,750 [4]
[1] Carrying value is net of $8,843 discount at December 31, 2012.
[2] Carrying value is net of $5,420 and $5,873 discount at September 30, 2013 and December 31, 2012, respectively.
[3] Carrying value includes a premium, applicable to notes issued in August 2012, of $4,027 and $4,328 atSeptember 30, 2013 and December 31, 2012, respectively.
[4] Carrying value is net of $3,823 and $4,029 discount at September 30, 2013 and December 31, 2012, respectively.