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Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Debt $ 3,194,543 $ 4,301,083
Less: current maturities of long-term debt 0 0
Long-term debt 3,194,543 4,301,083
Senior credit facility
    
Debt Instrument [Line Items]    
Debt 0 0
9.875% Senior Notes due 2016, net of $8,843 discount at December 31, 2012
    
Debt Instrument [Line Items]    
Debt 0 [1] 356,657 [1]
8.0% Senior Notes due 2018
    
Debt Instrument [Line Items]    
Debt 0 750,000
8.75% Senior Notes due 2020, net of $5,725 and $5,873 discount, respectively
    
Debt Instrument [Line Items]    
Debt 444,275 [2] 444,127 [2]
7.5% Senior Notes due 2021, including a premium of $4,230 and $4,328, respectively
    
Debt Instrument [Line Items]    
Debt 1,179,230 [3] 1,179,328 [3]
8.125% Senior Notes due 2022
    
Debt Instrument [Line Items]    
Debt 750,000 750,000
7.5% Senior Notes due 2023, net of $3,962 and $4,029 discount, respectively
    
Debt Instrument [Line Items]    
Debt $ 821,038 [4] $ 820,971 [4]
[1] Carrying value is net of $8,843 discount at December 31, 2012.
[2] Carrying value is net of $5,725 and $5,873 discount at March 31, 2013 and December 31, 2012, respectively.
[3] Carrying value includes a premium of $4,230 and $4,328 at March 31, 2013 and December 31, 2012, respectively, applicable to notes issued in August 2012.
[4] Carrying value is net of $3,962 and $4,029 discount at March 31, 2013 and December 31, 2012, respectively.