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Acquisitions - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Cash paid for acquisition |  |  |  |  |  |  |  |  |  | $ 16,654,000 | $ 11,945,000 | $ 0
Revenues |  | $ 201,190,000 | $ 140,279,000 | $ 136,664,000 | $ 239,356,000 | $ 180,403,000 | $ 126,936,000 | $ 125,084,000 | $ 185,160,000 | 717,489,000 | 617,583,000 | 498,860,000
Net Income |  | 17,801,000 | $ 5,538,000 | $ 6,387,000 | $ 26,855,000 | $ 26,101,000 | $ 6,833,000 | $ 6,046,000 | $ 19,144,000 | 56,580,000 | $ 58,124,000 | $ 44,675,000
Marlin and Ohl [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  | 18,400,000 |  |
ARM Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  |  |  |  |  |  |  |  |  | 2,500,000 |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  | $ 2,500,000.0 |  |  |  |  |  |  |  | $ 2,500,000.0 |  |
Chipola & Central Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers acquired through acquisition |  |  |  |  |  |  |  |  |  | 1,125 |  |
Unregulated Energy | Marlin [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  | $ 4,800,000 |  |
Unregulated Energy | Ohl [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers acquired through acquisition |  |  |  |  |  |  |  |  |  | 2,500 |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |
Unregulated Energy | ARM [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  |

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