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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | $ 146,296 | $ 170,081 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 146,296 | 170,081 |
Operating Income |  |  |  |
Total operating income |  | 36,380 | 37,508 |
Other income, net of other expenses |  | (34) | 133 |
Interest |  | 2,650 | 2,448 |
Income Before Income Taxes |  | 33,696 | 35,193 |
Income taxes |  | 13,329 | 14,084 |
Net Income |  | 20,367 | 21,109 | $ 41,140
Identifiable Assets |  |  |  |
Total identifiable assets |  | 1,081,984 |  | 1,067,421
Regulated Energy [Member] |  |  |  |
Operating Income |  |  |  |
Total operating income |  | 24,319 | 22,182 |
Identifiable Assets |  |  |  |
Total identifiable assets |  | 879,878 |  | 872,065
Unregulated Energy [Member] |  |  |  |
Operating Income |  |  |  |
Total operating income |  | 11,936 | 15,229 |
Identifiable Assets |  |  |  |
Total identifiable assets |  | 178,723 |  | 171,840
Other [Member] |  |  |  |
Identifiable Assets |  |  |  |
Total identifiable assets |  | 23,383 |  | $ 23,516
Other and eliminations [Member] |  |  |  |
Operating Income |  |  |  |
Total operating income |  | 125 | 97 |
Operating Revenues, Unaffiliated Customers [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | 146,296 | 170,081 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 146,296 | 170,081 |
Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | 88,894 | 109,292 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 88,894 | 109,292 |
Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers |  | 57,402 | 60,789 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers |  | 57,402 | 60,789 |
Intersegment Revenues [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 661 | 718 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 661 | 718 |
Intersegment Revenues [Member] | Regulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 322 | 290 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 322 | 290 |
Intersegment Revenues [Member] | Unregulated Energy [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 113 | 207 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 113 | 207 |
Intersegment Revenues [Member] | Other [Member] |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 226 | 221 |
Intersegment Revenues |  |  |  |
Total operating revenues, unaffiliated customers | [1] | $ 226 | $ 221 |
[1] | (1) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated operating revenues.

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