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Segment Information - Schedule of Segment Reporting Information by Segment (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Number of Reportable Segments 2    
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers $ 222,880 $ 191,187  
Operating Income      
Total operating income 54,865 51,597  
Other expense, net 913 375  
Interest 5,339 5,105  
Income Before Income Taxes 50,439 46,867  
Income Taxes 13,506 12,401  
Net Income 36,933 34,466  
Identifiable Assets      
Total identifiable assets 2,109,629   $ 2,114,869
Regulated Energy [Member]      
Operating Income      
Total operating income 34,681 32,637  
Identifiable Assets      
Total identifiable assets 1,620,209   1,629,191
Unregulated Energy [Member]      
Operating Income      
Total operating income 20,046 18,983  
Identifiable Assets      
Total identifiable assets 440,936   439,114
Other [Member]      
Identifiable Assets      
Total identifiable assets 48,484   $ 46,564
Other and eliminations [Member]      
Operating Income      
Total operating income 138 (23)  
Operating Revenues, Unaffiliated Customers [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers 222,880 191,187  
Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers 124,058 120,721  
Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers 98,822 70,466  
Intersegment Revenues [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers [1] 6,435 4,901  
Intersegment Revenues [Member] | Regulated Energy [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers [1] 3,833 476  
Intersegment Revenues [Member] | Unregulated Energy [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers [1] 1,996 4,293  
Intersegment Revenues [Member] | Other [Member]      
Operating Revenues, Unaffiliated Customers      
Total operating revenues, unaffiliated customers [1] 606 132  
Retained Earnings [Member]      
Operating Income      
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 36,933 34,466  
Net Income $ 36,933 $ 34,466  
[1] All significant intersegment revenues are billed at market rates and have been eliminated from consolidated operating revenues.