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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers $ 91,619 $ 86,545 $ 378,454 $ 321,419  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 91,619 86,545 378,454 321,419  
Operating Income          
Total operating income 7,792 8,720 49,872 44,422  
Other income, net of other expenses (32) 101 380 413  
Interest 2,495 2,026 6,954 6,114  
Income Before Income Taxes 5,265 6,795 43,298 38,721  
Income taxes 2,085 2,916 17,303 15,617  
Net Income 3,180 3,879 25,995 23,104 32,787
Identifiable Assets          
Total identifiable assets 847,550   847,550   837,522
Regulated Energy [Member]
         
Operating Income          
Total operating income 9,202 10,243 41,004 36,169  
Identifiable Assets          
Total identifiable assets 744,142   744,142   708,950
Unregulated Energy [Member]
         
Operating Income          
Total operating income (1,972) (1,803) 8,843 8,013  
Identifiable Assets          
Total identifiable assets 75,973   75,973   100,585
Other [Member]
         
Identifiable Assets          
Total identifiable assets 27,435   27,435   27,987
Other and eliminations [Member]
         
Operating Income          
Total operating income 562 280 25 240  
Operating Revenues, Unaffiliated Customers [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 91,619 86,545 378,454 321,419  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 91,619 86,545 378,454 321,419  
Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 59,086 55,387 222,308 191,666  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 59,086 55,387 222,308 191,666  
Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 27,041 26,103 141,215 115,367  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 27,041 26,103 141,215 115,367  
Operating Revenues, Unaffiliated Customers [Member] | Other [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 5,492 5,055 14,931 14,386  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 5,492 5,055 14,931 14,386  
Intersegment Revenues [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 558 [1] 2,726 [1] 1,770 5,451  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 558 [1] 2,726 [1] 1,770 5,451  
Intersegment Revenues [Member] | Regulated Energy [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 270 [1] 293 [1] 860 [1] 797 [1]  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 270 [1] 293 [1] 860 [1] 797 [1]  
Intersegment Revenues [Member] | Unregulated Energy [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 30 [1] 2,159 [1] 150 [1] 3,911 [1]  
Intersegment Revenues          
Total operating revenues, unaffiliated customers 30 [1] 2,159 [1] 150 [1] 3,911 [1]  
Intersegment Revenues [Member] | Other [Member]
         
Operating Revenues, Unaffiliated Customers          
Total operating revenues, unaffiliated customers 258 [1] 274 [1] 760 [1] 743 [1]  
Intersegment Revenues          
Total operating revenues, unaffiliated customers $ 258 [1] $ 274 [1] $ 760 [1] $ 743 [1]  
[1] (1) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated operating revenues.