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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Revenues from Individual Customers Constituting 10% or More of Total Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 649,050 | $ 687,974 | $ 720,868 | $ 740,598 | $ 696,825 | $ 648,872 | $ 577,484 | $ 564,087 | $ 2,798,490 | $ 2,487,268 | $ 1,804,741
U.S. Land |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,366,201 | 2,063,362 | $ 1,437,427
U.S. Land | EOG Resources, Inc. | Total Revenues | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 258,194 | $ 163,582 |

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