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Business Segment Information - Summarized Financial Information of Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 404,469 | $ 304,748 | $ 254,091 | $ 285,116 | $ 217,991 | $ 177,311 | $ 179,080 | $ 130,283 | $ 1,248,424 | $ 704,665 | $ 789,735
Operating income | 86,103 | $ 32,394 | $ 5,379 | $ 20,092 | (1,702) | $ (25,702) | $ (28,214) | $ (75,215) | 143,968 | (130,833) | (114,164)
Other income (expense) |  |  |  |  |  |  |  |  | (219,826) | (240,721) | 57,793
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | (75,858) | (371,554) | (56,371)
Total assets | 6,615,130 |  |  |  | 6,178,632 |  |  |  | 6,615,130 | 6,178,632 | 5,649,375
Property, plant and equipment, net | 6,173,486 |  |  |  | 5,919,567 |  |  |  | 6,173,486 | 5,919,567 | 5,218,242
Capital expenditures |  |  |  |  |  |  |  |  | 836,204 | 1,181,527 | 609,999
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 530,802 | 476,331 | 485,322
Impairment |  |  |  |  |  |  |  |  | 6,887 | 4,684 | 46,109
Exploration and Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,122,881 | 635,505 | 721,672
Midstream Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 185,799 | 120,853 | 104,695
Well Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 148,136 | 93,349 | 221,478
Operating segments | Exploration and Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,122,881 | 635,505 | 721,672
Operating income |  |  |  |  |  |  |  |  | 40,694 | (196,179) | (177,512)
Other income (expense) |  |  |  |  |  |  |  |  | (219,823) | (240,290) | 58,542
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | (179,129) | (436,469) | (118,970)
Total assets | 6,050,255 |  |  |  | 5,868,747 |  |  |  | 6,050,255 | 5,868,747 | 5,478,439
Property, plant and equipment, net | 5,663,323 |  |  |  | 5,620,558 |  |  |  | 5,663,323 | 5,620,558 | 5,057,311
Capital expenditures |  |  |  |  |  |  |  |  | 602,734 | 1,017,411 | 537,806
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 519,853 | 467,894 | 479,693
Impairment |  |  |  |  |  |  |  |  | 6,887 | 2,253 | 46,109
Operating segments | Midstream Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 72,752 | 35,406 | 23,769
Operating income |  |  |  |  |  |  |  |  | 102,377 | 68,868 | 60,668
Other income (expense) |  |  |  |  |  |  |  |  | (37) | (474) | (801)
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | 102,340 | 68,394 | 59,867
Total assets | 663,614 |  |  |  | 431,095 |  |  |  | 663,614 | 431,095 | 409,635
Property, plant and equipment, net | 649,923 |  |  |  | 424,197 |  |  |  | 649,923 | 424,197 | 264,956
Capital expenditures |  |  |  |  |  |  |  |  | 235,090 | 170,386 | 96,947
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 15,999 | 8,525 | 5,764
Impairment |  |  |  |  |  |  |  |  | 0 | 2,431 | 0
Operating segments | Well Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 52,791 | 33,754 | 44,294
Operating income |  |  |  |  |  |  |  |  | 15,057 | 3,428 | 49,145
Other income (expense) |  |  |  |  |  |  |  |  | 34 | 43 | 52
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | 15,091 | 3,471 | 49,197
Total assets | 52,800 |  |  |  | 51,167 |  |  |  | 52,800 | 51,167 | 470,614
Property, plant and equipment, net | 46,779 |  |  |  | 47,189 |  |  |  | 46,779 | 47,189 | 61,402
Capital expenditures |  |  |  |  |  |  |  |  | 12,537 | 680 | 21,711
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 12,939 | 14,892 | 19,073
Impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Inter-segment | Exploration and Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Inter-segment | Midstream Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 113,047 | 85,447 | 80,926
Inter-segment | Well Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 95,345 | 59,595 | 177,184
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (208,392) | (145,042) | (258,110)
Operating income |  |  |  |  |  |  |  |  | (14,160) | (6,950) | (46,465)
Other income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | (14,160) | (6,950) | (46,465)
Total assets | (151,539) |  |  |  | (172,377) |  |  |  | (151,539) | (172,377) | (709,313)
Property, plant and equipment, net | $ (186,539) |  |  |  | $ (172,377) |  |  |  | (186,539) | (172,377) | (165,427)
Capital expenditures |  |  |  |  |  |  |  |  | (14,157) | (6,950) | (46,465)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | (17,989) | (14,980) | (19,208)
Impairment |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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