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Stock-Based Compensation Plans - Allocation of Stock-Based Compensation by Functional Category (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Schedule Of Stock Option Activity [Line Items]          
Direct operating $ 32,636 $ 27,041 $ 62,824 $ 56,063  
Brokered natural gas and marketing 16,662 6,491 38,977 10,553  
Exploration 13,068 15,517 29,848 37,033  
General and administrative 101,987 44,005 186,045 82,734  
Total     2,030 [1]   4,049 [1]
Share Based Compensation Expense
         
Schedule Of Stock Option Activity [Line Items]          
Direct operating 696 692 1,357 1,049  
Brokered natural gas and marketing 530 408 779 861  
Exploration 960 994 2,030 1,922  
General and administrative 13,263 12,540 23,569 20,698  
Total $ 15,449 $ 14,634 $ 27,735 $ 24,530  
[1] Includes cost incurred whether capitalized or expensed.