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 | ||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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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]
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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]
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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]
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Identifiable Assets | |||||||||||
Total identifiable assets | 27,435 | 27,435 | 27,987 | ||||||||
Other and eliminations [Member]
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Operating Income | |||||||||||
Total operating income | 562 | 280 | 25 | 240 | |||||||
Operating Revenues, Unaffiliated Customers [Member]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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] | |||
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