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BUSINESS COMBINATIONS - MagVAR (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 08, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ 696,825 | $ 648,872 | $ 577,484 | $ 564,087 | $ 532,304 | $ 498,564 | $ 405,283 | $ 368,590 |  | $ 2,487,268 | $ 1,804,741 | $ 1,624,232
Net loss |  | (2,453) | $ 8,008 | $ 11,879 | $ (500,106) | 22,532 | $ 21,799 | $ 48,818 | $ 35,063 |  | $ (482,672) | 128,212 | 56,828
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Fair value of assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 64,777 |  |  |  | $ 51,705 |  |  |  | $ 64,777 | $ 64,777 | 51,705 | $ 4,718
Minimum | Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Maximum | Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 6 years |  |
MagVAR Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration net of closing adjustments | $ 47,900 |  |  |  |  |  |  |  |  |  |  |  |
Period escrow to be released to seller | 12 months |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  |  |  | $ 11,600 |  |
Net loss |  |  |  |  |  |  |  |  |  |  | 3,000 |  |
Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 48,485 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 2,286 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 13 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 28,700 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 17,791 |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired | 48,790 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 305 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of total assets acquired and liabilities assumed | 48,485 |  |  |  |  |  |  |  |  |  |  |  |
Pro forma financial information: |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax transaction costs excluded from pro forma earnings |  |  |  |  |  |  |  |  |  | 500 |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 2,490,955 | 1,814,215 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 480,423 | $ (126,355) |
MagVAR Acquisition | Prepaid expenses and other |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |
MagVAR Acquisition | Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards issued | 213,904 |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value of restricted stock | $ 13,100 |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |  |
MagVAR Acquisition | General and Administrative |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition transaction cost |  | $ 1,200 |  |  |  |  |  |  |  | $ 1,200 | $ 1,200 |  |
MagVAR Acquisition | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |
MagVAR Acquisition | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) | 20 years |  |  |  |  |  |  |  |  |  |  |  |

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