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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | $ 92,682 |  | $ 100,497 |  | $ 262,763 | $ 286,834 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 92,682 |  | 100,497 |  | 262,763 | 286,834 |
Operating Income |  |  |  |  |  |  |  |
Total operating income |  | 13,170 |  | 10,457 |  | 50,678 | 42,079 |
Other income, net of other expenses |  | (171) |  | 405 |  | (38) | 413 |
Interest |  | 2,485 |  | 2,303 |  | 4,933 | 4,459 |
Income Before Income Taxes |  | 10,514 |  | 8,559 |  | 45,707 | 38,033 |
Income taxes |  | 4,220 |  | 3,425 |  | 18,304 | 15,218 |
Net Income |  | 6,294 |  | 5,134 |  | 27,403 | 22,815 | $ 36,092
Identifiable Assets |  |  |  |  |  |  |  |
Total identifiable assets |  | 970,636 |  |  |  | 970,636 |  | 904,469
Regulated Energy [Member] |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |
Total operating income |  | 13,605 |  | 10,711 |  | 35,788 | 31,802 |
Identifiable Assets |  |  |  |  |  |  |  |
Total identifiable assets |  | 800,719 |  |  |  | 800,719 |  | 796,021
Unregulated Energy [Member] |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |
Total operating income |  | (540) |  | (43) |  | 14,689 | 10,815 |
Identifiable Assets |  |  |  |  |  |  |  |
Total identifiable assets |  | 147,102 |  |  |  | 147,102 |  | 84,732
Other [Member] |  |  |  |  |  |  |  |
Identifiable Assets |  |  |  |  |  |  |  |
Total identifiable assets |  | 22,815 |  |  |  | 22,815 |  | $ 23,716
Other and eliminations [Member] |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |
Total operating income |  | 105 |  | (211) |  | 201 | (538) |
Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 92,682 |  | 100,497 |  | 262,763 | 286,834 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 92,682 |  | 100,497 |  | 262,763 | 286,834 |
Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 61,790 |  | 61,348 |  | 171,082 | 163,222 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 61,790 |  | 61,348 |  | 171,082 | 163,222 |
Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 30,892 |  | 34,299 |  | 91,681 | 114,173 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 30,892 |  | 34,299 |  | 91,681 | 114,173 |
Operating Revenues, Unaffiliated Customers [Member] | Other [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 0 |  | 4,850 |  | 0 | 9,439 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 0 |  | 4,850 |  | 0 | 9,439 |
Intersegment Revenues [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 2,156 | [1] | 568 | [1] | 2,873 | 1,213 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers |  | 2,156 | [1] | 568 | [1] | 2,873 | 1,213 |
Intersegment Revenues [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 270 |  | 298 |  | 560 | 590 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 270 |  | 298 |  | 560 | 590 |
Intersegment Revenues [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 1,666 |  | 22 |  | 1,873 | 121 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 1,666 |  | 22 |  | 1,873 | 121 |
Intersegment Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | 220 |  | 248 |  | 440 | 502 |
Intersegment Revenues |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | [1] | $ 220 |  | $ 248 |  | $ 440 | $ 502 |
[1] | (1) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated operating revenues.

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