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Business Segment Information - Summarized Financial Information of Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 599,755 | $ 674,629 | $ 573,751 | $ 473,812 | $ 434,875 | $ 320,283 | $ 260,809 | $ 277,752 | $ 2,321,947 | $ 1,293,719 | $ 704,665
Operating income (loss) | 69,656 | $ 179,045 | $ (242,674) | $ 112,985 | 86,103 | $ 32,394 | $ 5,379 | $ 20,092 | 119,012 | 143,968 | (130,833)
Other income (expense) |  |  |  |  |  |  |  |  | (144,355) | (219,826) | (240,721)
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | (25,343) | (75,858) | (371,554)
Total assets | 7,626,142 |  |  |  | 6,622,929 |  |  |  | 7,626,142 | 6,622,929 | 6,178,632
Property, plant and equipment, net | 7,027,109 |  |  |  | 6,173,486 |  |  |  | 7,027,109 | 6,173,486 | 5,919,567
Capital expenditures |  |  |  |  |  |  |  |  | 2,203,453 | 836,204 | 1,181,527
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 636,296 | 530,802 | 476,331
General and administrative expenses |  |  |  |  |  |  |  |  | 121,346 | 91,797 | 89,342
Equity-based compensation |  |  |  |  |  |  |  |  | 29,273 | 26,534 | 24,103
Impairment |  |  |  |  |  |  |  |  | 384,228 | 6,887 | 4,684
Exploration and Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,136,735 | 1,168,176 | 635,505
Midstream Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 286,642 | 185,799 | 120,853
Well services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 205,619 | 148,136 | 93,349
Operating segments | Exploration and Production |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,136,735 | 1,168,176 | 635,505
Operating income (loss) |  |  |  |  |  |  |  |  | (25,027) | 40,694 | (196,179)
Other income (expense) |  |  |  |  |  |  |  |  | (142,265) | (219,823) | (240,290)
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | (167,292) | (179,129) | (436,469)
Total assets | 6,838,987 |  |  |  | 6,058,054 |  |  |  | 6,838,987 | 6,058,054 | 5,868,747
Property, plant and equipment, net | 6,311,566 |  |  |  | 5,663,323 |  |  |  | 6,311,566 | 5,663,323 | 5,620,558
Capital expenditures |  |  |  |  |  |  |  |  | 1,948,076 | 602,734 | 1,017,411
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 618,402 | 519,853 | 467,894
General and administrative expenses |  |  |  |  |  |  |  |  | 102,482 | 77,560 | 78,995
Equity-based compensation |  |  |  |  |  |  |  |  | 27,910 | 25,436 | 23,346
Impairment |  |  |  |  |  |  |  |  | 384,228 | 6,887 | 2,253
Operating segments | Midstream Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 124,137 | 72,752 | 35,406
Operating income (loss) |  |  |  |  |  |  |  |  | 143,126 | 102,377 | 68,868
Other income (expense) |  |  |  |  |  |  |  |  | (2,125) | (37) | (474)
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | 141,001 | 102,340 | 68,394
Total assets | 920,619 |  |  |  | 663,614 |  |  |  | 920,619 | 663,614 | 431,095
Property, plant and equipment, net | 893,285 |  |  |  | 649,923 |  |  |  | 893,285 | 649,923 | 424,197
Capital expenditures |  |  |  |  |  |  |  |  | 277,626 | 235,090 | 170,386
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 29,282 | 15,999 | 8,525
General and administrative expenses |  |  |  |  |  |  |  |  | 24,700 | 19,583 | 12,112
Equity-based compensation |  |  |  |  |  |  |  |  | 1,547 | 1,461 | 911
Impairment |  |  |  |  |  |  |  |  | 0 | 0 | 2,431
Operating segments | Well services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 61,075 | 52,791 | 33,754
Operating income (loss) |  |  |  |  |  |  |  |  | 30,988 | 15,057 | 3,428
Other income (expense) |  |  |  |  |  |  |  |  | 35 | 34 | 43
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | 31,023 | 15,091 | 3,471
Total assets | 48,150 |  |  |  | 52,800 |  |  |  | 48,150 | 52,800 | 51,167
Property, plant and equipment, net | 38,871 |  |  |  | 46,779 |  |  |  | 38,871 | 46,779 | 47,189
Capital expenditures |  |  |  |  |  |  |  |  | 7,831 | 12,537 | 680
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 15,698 | 12,939 | 14,892
General and administrative expenses |  |  |  |  |  |  |  |  | 23,282 | 24,359 | 24,427
Equity-based compensation |  |  |  |  |  |  |  |  | 1,588 | 1,264 | 1,515
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 |  |  |  |  |  |  |  |  | 162,505 | 113,047 | 85,447
Inter-segment | Well services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 144,544 | 95,345 | 59,595
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (307,049) | (208,392) | (145,042)
Operating income (loss) |  |  |  |  |  |  |  |  | (30,075) | (14,160) | (6,950)
Other income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before income taxes including non-controlling interests |  |  |  |  |  |  |  |  | (30,075) | (14,160) | (6,950)
Total assets | (181,614) |  |  |  | (151,539) |  |  |  | (181,614) | (151,539) | (172,377)
Property, plant and equipment, net | $ (216,613) |  |  |  | $ (186,539) |  |  |  | (216,613) | (186,539) | (172,377)
Capital expenditures |  |  |  |  |  |  |  |  | (30,080) | (14,157) | (6,950)
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | (27,086) | (17,989) | (14,980)
General and administrative expenses |  |  |  |  |  |  |  |  | (29,118) | (29,705) | (26,192)
Equity-based compensation |  |  |  |  |  |  |  |  | (1,772) | (1,627) | (1,669)
Impairment |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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