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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 $ 569,968 $ 488,198 $ 479,605
Intersegment Revenues (1)                      
Total intersegment revenues                 569,968 488,198 479,605
Operating Income                      
Operating Income                 131,112 112,723 106,285
Other income                 1,721 3,222 (1,847)
Interest charges                 20,135 21,765 22,224
Income Before Income taxes                 112,698 94,180 82,214
Income Taxes on Continuing Operations                 29,231 23,538 21,114
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 83,467 70,642 61,100
Net Income $ 22,352 $ 9,261 $ 10,956 $ 28,930 $ 22,564 $ 5,621 $ 8,304 $ 28,663 83,466 71,498 65,153
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 (1) 686 (1,349)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax                 0 170 5,402
Depreciation and Amortization                      
Total depreciation and amortization                 62,661 58,117 45,424
Identifiable Assets                      
Total identifiable assets 2,114,869       1,932,487       2,114,869 1,932,487  
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax                 (1) 686 (1,349)
Regulated Energy                      
Operating Income                      
Operating Income                 106,064 92,124 86,584
Depreciation and Amortization                      
Total depreciation and amortization                 48,748 46,079 35,227
Payments to Acquire Productive Assets                 139,733 147,100 130,604
Unregulated Energy                      
Operating Income                      
Operating Income                 24,382 20,664 19,938
Depreciation and Amortization                      
Total depreciation and amortization                 13,869 11,988 10,130
Payments to Acquire Productive Assets                 81,651 46,295 60,034
Other                      
Operating Income                      
Operating Income                 666 (65) (237)
Depreciation and Amortization                      
Payments to Acquire Productive Assets                 6,425 2,480 8,348
Other and eliminations                      
Depreciation and Amortization                      
Total depreciation and amortization                 44 50 67
Total for Segments [Member]                      
Depreciation and Amortization                      
Payments to Acquire Productive Assets                 227,809 195,875 198,986
Operating Segments                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 569,968 488,198 479,605
Intersegment Revenues (1)                      
Total intersegment revenues                 569,968 488,198 479,605
Operating Segments | Regulated Energy                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 381,879 350,853 340,857
Intersegment Revenues (1)                      
Total intersegment revenues                 381,879 350,853 340,857
Identifiable Assets                      
Total identifiable assets 1,629,191       1,547,619       1,629,191 1,547,619  
Operating Segments | Unregulated Energy                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 188,089 137,345 138,748
Intersegment Revenues (1)                      
Total intersegment revenues                 188,089 137,345 138,748
Identifiable Assets                      
Total identifiable assets 439,114       347,665       439,114 347,665  
Intersegment Eliminations                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues [1]                 21,348 17,602 18,081
Intersegment Revenues (1)                      
Total intersegment revenues [1]                 21,348 17,602 18,081
Intersegment Eliminations | Regulated Energy                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 2,041 1,893 2,149
Intersegment Revenues (1)                      
Total intersegment revenues                 2,041 1,893 2,149
Intersegment Eliminations | Unregulated Energy                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 18,780 15,181 15,403
Intersegment Revenues (1)                      
Total intersegment revenues                 18,780 15,181 15,403
Intersegment Eliminations | Other                      
Operating Revenues, Unaffiliated Customers                      
Total intersegment revenues                 527 528 529
Intersegment Revenues (1)                      
Total intersegment revenues                 527 528 $ 529
Other And Intersegment Eliminations                      
Identifiable Assets                      
Total identifiable assets $ 46,564       $ 37,203       $ 46,564 $ 37,203  
[1] All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.