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Fair Value Measurements - Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2013
Fair Value, Measurements, Recurring
Dec. 31, 2012
Fair Value, Inputs, Level 1
Dec. 31, 2013
Fair Value, Inputs, Level 1
Fair Value, Measurements, Recurring
Dec. 31, 2012
Swaps
Dec. 31, 2013
Swaps
Fair Value, Measurements, Recurring
Dec. 31, 2012
Swaps
Fair Value, Inputs, Level 2
Dec. 31, 2013
Swaps
Fair Value, Inputs, Level 2
Fair Value, Measurements, Recurring
Dec. 31, 2012
Collars
Dec. 31, 2013
Collars
Fair Value, Measurements, Recurring
Dec. 31, 2012
Collars
Fair Value, Inputs, Level 2
Dec. 31, 2013
Collars
Fair Value, Inputs, Level 2
Fair Value, Measurements, Recurring
Dec. 31, 2012
Basis Swap
Dec. 31, 2013
Basis Swap
Fair Value, Measurements, Recurring
Dec. 31, 2012
Basis Swap
Fair Value, Inputs, Level 2
Dec. 31, 2013
Basis Swap
Fair Value, Inputs, Level 2
Fair Value, Measurements, Recurring
Dec. 31, 2013
Basis Swap
Fair Value, Inputs, Level 3
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                                  
Trading securities held in the deferred compensation plans $ 57,776 $ 67,766 $ 57,776 $ 67,766                          
Derivative assets liabilities at fair value net         $ 23,326 $ (18,812) $ 23,326 $ (18,812) $ 121,014 $ 2,314 $ 121,014 $ 2,314 $ 993 $ 3,929 $ 993 $ 3,381 $ 548