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OTHER ITEMS AND CHARGES - Narrative (Detail) - USD ($) $ in Thousands | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2014
Unusual or Infrequent Item [Line Items] |  |  |  |
Environmental remediation charge | $ 950 | $ 900 | $ 0 | $ 400
Legal costs for the acquisition | 0 | 0 | 0 | 144
Development project charge | 0 | 0 | 0 | 1,394
Severance and reorganization charge | $ 0 | $ 0 | $ 0 | 586
Maine Energy Facility |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |
Development project charge |  |  |  | $ 1,394
Tompkins |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |
Equity method investment membership interest |  |  |  | 50.00%

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