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Revenue Recognition - Disaggregation of Revenues (Details) - 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
Disaggregation of Revenue [Line Items]                      
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
Well services                      
Disaggregation of Revenue [Line Items]                      
Revenues                 205,619 148,136 93,349
Midstream                      
Disaggregation of Revenue [Line Items]                      
Revenues                 286,642 185,799 120,853
Exploration and Production                      
Disaggregation of Revenue [Line Items]                      
Revenues                 2,136,735 1,168,176 635,505
Exploration and Production | Oil revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 1,425,409 912,806 586,308
Exploration and Production | Purchased oil sales                      
Disaggregation of Revenue [Line Items]                      
Revenues                 540,633 132,331 10,272
Exploration and Production | Natural gas revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 113,095 79,823 33,988
Exploration and Production | Purchased gas sales                      
Disaggregation of Revenue [Line Items]                      
Revenues                 6,078 1,211 0
Exploration and Production | NGL revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 51,520 42,005 4,937
Operating segments | Well services                      
Disaggregation of Revenue [Line Items]                      
Revenues                 61,075 52,791 33,754
Operating segments | Midstream                      
Disaggregation of Revenue [Line Items]                      
Revenues                 124,137 72,752 35,406
Operating segments | Exploration and Production                      
Disaggregation of Revenue [Line Items]                      
Revenues                 2,136,735 1,168,176 635,505
Operating segments | Well services                      
Disaggregation of Revenue [Line Items]                      
Revenues                 61,075 52,791 33,754
Operating segments | Well services | Hydraulic fracturing service revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 56,620 49,266 30,965
Operating segments | Well services | Equipment rental revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 4,455 3,525 2,789
Operating segments | Midstream                      
Disaggregation of Revenue [Line Items]                      
Revenues                 124,137 72,752 35,406
Operating segments | Midstream | Purchased oil sales                      
Disaggregation of Revenue [Line Items]                      
Revenues                 3,633 0 0
Operating segments | Midstream | Purchased gas sales                      
Disaggregation of Revenue [Line Items]                      
Revenues                 1,464 0 0
Operating segments | Midstream | Crude oil and natural gas revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 73,028 37,369 5,186
Operating segments | Midstream | Water revenues                      
Disaggregation of Revenue [Line Items]                      
Revenues                 $ 46,012 $ 35,383 $ 30,220