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Business Segment Information - Summarized Financial Information of Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Total revenues $ 230,046 $ 372,378 $ 410,433 $ 721,897  
Operating income (loss) (7,437) 166,545 (41,072) 495,625  
Other income (expense) (76,638) (104,425) (68,420) (162,033)  
Income (loss) before income taxes (84,075) 62,120 (109,492) 333,592  
Property, plant and equipment, net 5,356,657   5,356,657   $ 5,186,786
Total assets 5,783,932   5,783,932   5,938,412
Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 214,110 354,183 387,969 686,030  
Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 58,688 58,447 109,593 110,853  
Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 28,661 13,478 46,303 22,831  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 230,046 372,378 410,433 721,897  
Operating income (loss) (7,437) 166,545 (41,072) 495,625  
Other income (expense) (76,638) (104,425) (68,420) (162,033)  
Income (loss) before income taxes (84,075) 62,120 (109,492) 333,592  
Property, plant and equipment, net 5,356,657   5,356,657   5,186,786
Total assets 5,783,932   5,783,932   5,938,412
Operating Segments [Member] | Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 214,110 354,183 387,969 686,030  
Operating income (loss) (22,529) 153,669 (64,776) 476,615  
Other income (expense) (76,635) (104,448) (68,396) (162,108)  
Income (loss) before income taxes (99,164) 49,221 (133,172) 314,507  
Property, plant and equipment, net 5,179,023   5,179,023   5,074,588
Total assets 5,599,726   5,599,726   5,802,295
Operating Segments [Member] | Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 9,219 14,877 11,927 30,704  
Operating income (loss) 9,008 16,295 18,618 29,747  
Other income (expense) 22 23 20 75  
Income (loss) before income taxes 9,030 16,318 18,638 29,822  
Property, plant and equipment, net 70,924   70,924   58,767
Total assets 385,362   385,362   281,844
Operating Segments [Member] | Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 6,717 3,318 10,537 5,163  
Operating income (loss) 15,947 6,096 25,255 10,728  
Other income (expense) (25)   (44)    
Income (loss) before income taxes 15,922 6,096 25,211 10,728  
Property, plant and equipment, net 245,842   245,842   172,394
Total assets 330,858   330,858   212,685
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (71,413) (53,730) (133,432) (97,817)  
Operating income (loss) (9,863) (9,515) (20,169) (21,465)  
Income (loss) before income taxes (9,863) (9,515) (20,169) (21,465)  
Property, plant and equipment, net (139,132)   (139,132)   (118,963)
Total assets (532,014)   (532,014)   $ (358,412)
Segment Reconciling Items [Member] | Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 49,469 43,570 97,666 80,149  
Segment Reconciling Items [Member] | Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues $ 21,944 $ 10,160 $ 35,766 $ 17,668