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Summarized Financial Information Concerning Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information          
Revenues $ 570,543 $ 565,251 $ 1,139,377 $ 1,034,282  
Inter-segment revenue (57,556) (86,817) (114,700) (174,213)  
Total revenues 512,987 478,434 1,024,677 860,069  
Income (loss) from operations 86,458 [1] 762,413 [1] (273,068) [2] 610,757 [2]  
Interest income (expense) (61,159) (68,569) (147,069) (135,534)  
Bargain purchase gain 0 122,696 0 122,696  
Loss on extinguishment of debt 0 0 (82,005) 0  
Other (expense) income, net (106) (81) 505 2,387  
Income (loss) before income taxes 25,193 816,459 (501,637) 600,306  
Capital expenditures 387,158 [3] 562,054 [3] 775,870 [3] 1,131,712 [3]  
Depreciation, depletion, amortization, accretion and impairment 180,368   363,009    
Depreciation, depletion, amortization and accretion 164,725 162,573 347,366 266,758  
Total assets 7,753,636   7,753,636   9,790,731
Exploration and Production
          
Segment Reporting Information          
Revenues 458,374 434,834 939,784 777,955  
Inter-segment revenue (81) (77) (162) (155)  
Total revenues 458,293 434,757 939,622 777,800  
Income (loss) from operations 241,666 [1] 786,335 [1] (60,042) [2] 662,499 [2]  
Interest income (expense) 317 416 635 559  
Bargain purchase gain   122,696   122,696  
Loss on extinguishment of debt     0    
Other (expense) income, net (330) 242 298 2,010  
Income (loss) before income taxes 241,653 909,689 (59,109) 787,764  
Capital expenditures 358,582 [3] 518,343 [3] 716,173 [3] 1,010,248 [3]  
Depreciation, depletion, amortization, accretion and impairment 148,884   316,397    
Depreciation, depletion, amortization and accretion   147,479   237,531  
Total assets 5,923,355   5,923,355   8,681,056
Drilling and Oil Field Services
          
Segment Reporting Information          
Revenues 47,100 104,076 96,837 202,408  
Inter-segment revenue (31,011) (70,444) (63,378) (139,467)  
Total revenues 16,089 33,632 33,459 62,941  
Income (loss) from operations (19,443) [1] 4,678 [1] (28,408) [2] 8,157 [2]  
Interest income (expense) 0 0 0 0  
Bargain purchase gain   0   0  
Loss on extinguishment of debt     0    
Other (expense) income, net 0 0 0 0  
Income (loss) before income taxes (19,443) 4,678 (28,408) 8,157  
Capital expenditures 883 [3] 5,836 [3] 1,515 [3] 13,752 [3]  
Depreciation, depletion, amortization, accretion and impairment 19,478   28,292    
Depreciation, depletion, amortization and accretion   8,624   17,174  
Total assets 172,329   172,329   199,523
Midstream Services
          
Segment Reporting Information          
Revenues 64,291 24,798 101,125 50,960  
Inter-segment revenue (26,464) (16,296) (51,160) (34,591)  
Total revenues 37,827 8,502 49,965 16,369  
Income (loss) from operations (7,956) [1] (3,631) [1] (10,415) [2] (6,358) [2]  
Interest income (expense) (84) (137) (209) (293)  
Bargain purchase gain   0   0  
Loss on extinguishment of debt     0    
Other (expense) income, net 135 0 (664) 0  
Income (loss) before income taxes (7,905) (3,768) (11,288) (6,651)  
Capital expenditures 15,111 [3] 17,754 [3] 30,332 [3] 41,729 [3]  
Depreciation, depletion, amortization, accretion and impairment 4,017   5,705    
Depreciation, depletion, amortization and accretion   1,717   3,128  
Total assets 171,461   171,461   151,492
All Other
          
Segment Reporting Information          
Revenues 778 1,543 1,631 2,959  
Inter-segment revenue 0 0 0 0  
Total revenues 778 1,543 1,631 2,959  
Income (loss) from operations (127,809) [1] (24,969) [1] (174,203) [2] (53,541) [2]  
Interest income (expense) (61,392) (68,848) (147,495) (135,800)  
Bargain purchase gain   0   0  
Loss on extinguishment of debt     (82,005)    
Other (expense) income, net 89 (323) 871 377  
Income (loss) before income taxes (189,112) (94,140) (402,832) (188,964)  
Capital expenditures 12,582 [3] 20,121 [3] 27,850 [3] 65,983 [3]  
Depreciation, depletion, amortization, accretion and impairment 7,989   12,615    
Depreciation, depletion, amortization and accretion   4,753   8,925  
Total assets $ 1,486,491   $ 1,486,491   $ 758,660
[1] Exploration and production segment income from operations includes unrealized gains of $85.9 million and $580.7 million on commodity derivative contracts for the three-month periods ended June 30, 2013 and 2012, respectively.
[2] Exploration and production segment (loss) income from operations includes unrealized gains of $61.1 million and $451.5 million on commodity derivative contracts for the six-month periods ended June 30, 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 six-month period ended June 30, 2013.
[3] On an accrual basis.