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Business Segment Information - Summarized Financial Information of Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Total revenues $ 197,235 $ 368,659 $ 607,668 $ 1,090,556  
Operating income (loss) (19,926) 134,103 (60,998) 629,728  
Other income (expense) 67,373 63,968 (1,047) (98,065)  
Income (loss) before income taxes 47,447 198,071 (62,045) 531,663  
Property, plant and equipment, net 5,307,575   5,307,575   $ 5,186,786
Total assets 5,725,108   5,725,108   5,938,412
Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 175,270 344,706 563,239 1,030,735  
Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 48,935 87,223 158,528 198,077  
Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 29,812 13,624 76,115 36,455  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 197,235 368,659 607,668 1,090,556  
Operating income (loss) (19,926) 134,103 (60,998) 629,728  
Other income (expense) 67,373 63,968 (1,047) (98,065)  
Income (loss) before income taxes 47,447 198,071 (62,045) 531,663  
Property, plant and equipment, net 5,307,575   5,307,575   5,186,786
Total assets 5,725,108   5,725,108   5,938,412
Operating Segments [Member] | Exploration and Production [Member]          
Segment Reporting Information [Line Items]          
Total revenues 175,270 344,706 563,239 1,030,735  
Operating income (loss) (38,289) 126,184 (103,065) 602,797  
Other income (expense) 67,359 63,968 (1,037) (98,140)  
Income (loss) before income taxes 29,070 190,152 (104,102) 504,657  
Property, plant and equipment, net 5,130,061   5,130,061   5,074,588
Total assets 5,541,674   5,541,674   5,802,295
Operating Segments [Member] | Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 15,381 20,925 27,308 51,630  
Operating income (loss) 10,936 23,388 29,554 53,137  
Other income (expense) 14 0 34 75  
Income (loss) before income taxes 10,950 23,388 29,588 53,212  
Property, plant and equipment, net 66,058   66,058   58,767
Total assets 421,642   421,642   281,844
Operating Segments [Member] | Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 6,584 3,028 17,121 8,191  
Operating income (loss) 18,828 5,126 44,083 15,854  
Other income (expense) 0   (44)    
Income (loss) before income taxes 18,828 5,126 44,039 15,854  
Property, plant and equipment, net 261,989   261,989   172,394
Total assets 378,284   378,284   212,685
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (56,782) (76,894) (190,214) (174,711)  
Operating income (loss) (11,401) (20,595) (31,570) (42,060)  
Income (loss) before income taxes (11,401) (20,595) (31,570) (42,060)  
Property, plant and equipment, net (150,533)   (150,533)   (118,963)
Total assets (616,492)   (616,492)   $ (358,412)
Segment Reconciling Items [Member] | Well Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 33,554 66,298 131,220 146,447  
Segment Reconciling Items [Member] | Midstream Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues $ 23,228 $ 10,596 $ 58,994 $ 28,264