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Summarized Financial Information Concerning Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Revenues $ 568,834 $ 469,030  
Inter-segment revenue (57,144) (87,395)  
Total revenues 511,690 381,635  
(Loss) income from operations (359,526) [1] (151,656) [1]  
Interest income (expense), net (85,910) (66,965)  
Loss on extinguishment of debt (82,005) 0  
Other income (expense), net 611 2,468  
Loss before income taxes (526,830) (216,153)  
Capital expenditures 388,712 [2] 569,658 [2]  
Depreciation, depletion, amortization and accretion 182,641 104,186  
Total assets 7,678,311   9,790,731
Exploration and Production
      
Segment Reporting Information [Line Items]      
Revenues 481,410 343,120  
Inter-segment revenue (81) (77)  
Total revenues 481,329 343,043  
(Loss) income from operations (301,707) [1] (123,836) [1]  
Interest income (expense), net 318 143  
Loss on extinguishment of debt 0    
Other income (expense), net 628 1,768  
Loss before income taxes (300,761) (121,925)  
Capital expenditures 357,591 [2] 491,905 [2]  
Depreciation, depletion, amortization and accretion 167,513 90,052  
Total assets 5,647,302   8,681,056
Drilling and Oil Field Services
      
Segment Reporting Information [Line Items]      
Revenues 49,737 98,332  
Inter-segment revenue (32,367) (69,023)  
Total revenues 17,370 29,309  
(Loss) income from operations (8,965) [1] 3,479 [1]  
Interest income (expense), net 0 0  
Loss on extinguishment of debt 0    
Other income (expense), net 0 0  
Loss before income taxes (8,965) 3,479  
Capital expenditures 632 [2] 7,916 [2]  
Depreciation, depletion, amortization and accretion 8,814 8,550  
Total assets 192,087   199,523
Midstream Services
      
Segment Reporting Information [Line Items]      
Revenues 36,834 26,162  
Inter-segment revenue (24,696) (18,295)  
Total revenues 12,138 7,867  
(Loss) income from operations (2,459) [1] (2,727) [1]  
Interest income (expense), net (125) (156)  
Loss on extinguishment of debt 0    
Other income (expense), net (800) 0  
Loss before income taxes (3,384) (2,883)  
Capital expenditures 15,221 [2] 23,975 [2]  
Depreciation, depletion, amortization and accretion 1,687 1,411  
Total assets 159,843   151,492
All Other
      
Segment Reporting Information [Line Items]      
Revenues 853 1,416  
Inter-segment revenue 0 0  
Total revenues 853 1,416  
(Loss) income from operations (46,395) [1] (28,572) [1]  
Interest income (expense), net (86,103) (66,952)  
Loss on extinguishment of debt (82,005)    
Other income (expense), net 783 700  
Loss before income taxes (213,720) (94,824)  
Capital expenditures 15,268 [2] 45,862 [2]  
Depreciation, depletion, amortization and accretion 4,627 4,173  
Total assets $ 1,679,079   $ 758,660
[1] Exploration and production segment income from operations includes unrealized losses of $24.8 million and $129.2 million on commodity derivative contracts for the three-month periods ended March 31, 2013 and 2012, respectively. Exploration and production segment also includes a loss on the sale of the Permian Properties of $399.1 million for the three-month period ended March 31, 2013.
[2] On an accrual basis.