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Business Segment Information - Summarized Financial Information of Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Total revenues $ 182,067 $ 197,235 $ 230,046 $ 180,387 $ 299,672 $ 368,659 $ 372,378 $ 349,519 $ 789,735 $ 1,390,228 $ 1,141,999
Operating income (loss) (53,166) $ (19,926) $ (7,437) $ (33,635) 15,924 $ 134,103 $ 166,545 $ 329,080 (114,164) 645,652 504,398
Other income (expense)                 57,793 168,816 (141,381)
Income (loss) before income taxes                 (56,371) 814,468 363,017
Total assets 5,649,375       5,909,076       5,649,375 5,909,076 4,678,041
Capital expenditures                 609,999 1,572,593 2,506,298
Depreciation, depletion and amortization                 485,322 412,334 307,055
Impairment of oil and gas properties                 46,109 47,238 1,168
Exploration and Production                      
Segment Reporting Information [Line Items]                      
Total revenues                 721,672 1,304,004 1,084,412
Well Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 221,478 267,384 180,686
Midstream Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 104,695 50,958 29,230
Operating segments | Exploration and Production                      
Segment Reporting Information [Line Items]                      
Total revenues                 721,672 1,304,004 1,084,412
Operating income (loss)                 (177,512) 610,850 473,178
Other income (expense)                 58,542 168,741 (141,397)
Income (loss) before income taxes                 (118,970) 779,591 331,781
Total assets 5,478,439       5,772,959       5,478,439 5,772,959 4,558,257
Capital expenditures                 537,806 1,525,168 2,514,737
Depreciation, depletion and amortization                 479,693 406,960 304,388
Impairment of oil and gas properties                 46,109 47,238  
Operating segments | Well Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 44,294 74,610 51,845
Operating income (loss)                 49,145 70,878 56,322
Other income (expense)                 52 75 16
Income (loss) before income taxes                 49,197 70,953 56,338
Total assets 470,614       281,844       470,614 281,844 78,359
Capital expenditures                 21,711 37,292 15,217
Depreciation, depletion and amortization                 19,073 14,080 7,150
Operating segments | Midstream Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 23,769 11,614 5,742
Operating income (loss)                 60,668 22,730 17,509
Other income (expense)                 (801) 0 0
Income (loss) before income taxes                 59,867 22,730 17,509
Total assets 409,635       212,685       409,635 212,685 117,641
Capital expenditures                 96,947 68,939 18,955
Depreciation, depletion and amortization                 5,764 3,744 2,780
Inter-segment | Exploration and Production                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Inter-segment | Well Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 177,184 192,774 128,841
Inter-segment | Midstream Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 80,926 39,344 23,488
Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (258,110) (232,118) (152,329)
Operating income (loss)                 (46,465) (58,806) (42,611)
Other income (expense)                 0 0 0
Income (loss) before income taxes                 (46,465) (58,806) (42,611)
Total assets $ (709,313)       $ (358,412)       (709,313) (358,412) (76,216)
Capital expenditures                 (46,465) (58,806) (42,611)
Depreciation, depletion and amortization                 $ (19,208) $ (12,450) $ (7,263)