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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  | $ 201,190 | $ 140,279 | $ 136,664 | $ 239,356 | $ 180,403 | $ 126,936 | $ 125,084 | $ 185,160 | $ 717,489 | $ 617,583 | $ 498,860
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  | 201,190 | 140,279 | 136,664 | 239,356 | 180,403 | 126,936 | 125,084 | 185,160 | 717,489 | 617,583 | 498,860
Operating Income |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  | 28,930 | 12,036 | 13,248 | 40,406 | 23,628 | 14,632 | 14,061 | 35,099 | 94,620 | 87,420 | 85,983
Other income |  |  |  |  |  |  |  |  |  | (615) | (2,342) | (2,328)
Interest charges |  |  |  |  |  |  |  |  |  | 16,431 | 12,645 | 10,639
Income Before Income taxes |  |  |  |  |  |  |  |  |  | 77,574 | 72,433 | 73,016
Income taxes |  |  |  |  |  |  |  |  |  | 20,994 | 14,309 | 28,341
Net Income |  | 17,801 | $ 5,538 | $ 6,387 | $ 26,855 | 26,101 | $ 6,833 | $ 6,046 | $ 19,144 | 56,580 | 58,124 | 44,675
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 40,802 | 36,599 | 32,159
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets |  | 1,693,671 |  |  |  | 1,414,934 |  |  |  | 1,693,671 | 1,414,934 |
Regulated Energy |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  | 79,215 | 74,584 | 71,515
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 31,876 | 28,554 | 25,677
Payments to Acquire Productive Assets |  |  |  |  |  |  |  |  |  | 235,912 | 159,011 | 139,994
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets |  | 1,345,805 |  |  |  | 1,121,673 |  |  |  | 1,345,805 | 1,121,673 |
Unregulated Energy |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  | 16,901 | 12,631 | 14,066
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 8,845 | 7,954 | 6,386
Payments to Acquire Productive Assets |  |  |  |  |  |  |  |  |  | 38,700 | 26,190 | 23,984
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets |  | 306,045 |  |  |  | 259,041 |  |  |  | 306,045 | 259,041 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  | (1,496) | 205 | 402
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  |  |  |  |  |  | 8,364 | 5,902 | 5,398
Identifiable Assets |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable assets |  | $ 41,821 |  |  |  | $ 34,220 |  |  |  | 41,821 | 34,220 |
Other and eliminations |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 81 | 91 | 96
Total for Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  |  |  |  |  |  | 282,976 | 191,103 | 169,376
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  |  | 717,489 | 617,583 | 498,860
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  |  | 717,489 | 617,583 | 498,860
Operating Segments | Regulated Energy |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  |  | 332,749 | 316,971 | 302,402
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  |  | 332,749 | 316,971 | 302,402
Operating Segments | Unregulated Energy |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  |  | 384,740 | 300,612 | 196,458
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues |  |  |  |  |  |  |  |  |  | 384,740 | 300,612 | 196,458
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 49,062 | 34,096 | 11,488
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 49,062 | 34,096 | 11,488
Intersegment Eliminations | Regulated Energy |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 9,339 | 12,532 | 3,287
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 9,339 | 12,532 | 3,287
Intersegment Eliminations | Unregulated Energy |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 23,983 | 35,877 | 7,321
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 23,983 | 35,877 | 7,321
Intersegment Eliminations | Other |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | 774 | 653 | 880
Intersegment Revenues (1) |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment revenues | [1] |  |  |  |  |  |  |  |  | $ 774 | $ 653 | $ 880
[1] | All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.

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