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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Reportable Segments |  | 2 |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | $ 239,356 | $ 185,160 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 239,356 | 185,160 |
Operating Income |  |  |  |
Total operating income |  | 40,406 | 35,099 |
Other expense, net |  | 68 | (700) |
Interest |  | 3,664 | 2,739 |
Income Before Income Taxes |  | 36,810 | 31,660 |
Income taxes |  | 9,955 | 12,516 |
Net Income |  | 26,855 | 19,144 | $ 58,124
Identifiable Assets |  |  |  |
Total identifiable assets |  | 1,427,450 |  | 1,417,434
Regulated Energy [Member] |  |  |  |
Operating Income |  |  |  |
Total operating income |  | 26,711 | 23,395 |
Identifiable Assets |  |  |  |
Total identifiable assets |  | 1,148,635 |  | 1,121,673
Unregulated Energy [Member] |  |  |  |
Operating Income |  |  |  |
Total operating income |  | 13,684 | 11,575 |
Identifiable Assets |  |  |  |
Total identifiable assets |  | 246,230 |  | 261,541
Other [Member] |  |  |  |
Identifiable Assets |  |  |  |
Total identifiable assets |  | 32,585 |  | $ 34,220
Other and eliminations [Member] |  |  |  |
Operating Income |  |  |  |
Total operating income |  | 11 | 129 |
Operating Revenues, Unaffiliated Customers [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | 239,356 | 185,160 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 239,356 | 185,160 |
Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | 105,954 | 96,446 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 105,954 | 96,446 |
Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | 133,402 | 88,714 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 133,402 | 88,714 |
Intersegment Revenues [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 15,598 | 5,447 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 15,598 | 5,447 |
Intersegment Revenues [Member] | Regulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 3,439 | 1,208 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 3,439 | 1,208 |
Intersegment Revenues [Member] | Unregulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 11,965 | 4,011 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 11,965 | 4,011 |
Intersegment Revenues [Member] | Other [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 194 | 228 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | $ 194 | $ 228 |
[1] | All significant intersegment revenues are billed at market rates and have been eliminated from consolidated operating revenues.

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