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Significant Segment Financial Data (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Operating Revenue – Non-Regulated |  |  |  |  |  |  |  |  |  | $ 900 | $ 4,700
Total Operating Revenues | $ 116,900 | $ 87,400 | $ 83,900 | $ 130,400 | $ 116,400 | $ 85,300 | $ 84,400 | $ 152,100 | $ 418,600 | 438,200 | 444,100
Interest Income |  |  |  |  |  |  |  |  | 2,600 | 2,900 | 2,400
Interest Expense |  |  |  |  |  |  |  |  | 26,400 | 26,600 | 26,400
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 54,500 | 52,000 | 50,400
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 10,249 | 13,808 | 8,393
Segment Profit | 13,600 | $ 300 | $ 3,100 | $ 15,200 | 11,400 | $ 2,300 | $ 4,000 | $ 26,500 | 32,200 | 44,200 | 33,000
Segment Assets | 1,477,900 |  |  |  | 1,370,800 |  |  |  | 1,477,900 | 1,370,800 | 1,298,300
Capital Expenditures |  |  |  |  |  |  |  |  | 122,600 | 119,200 | 102,400
Billed and Unbilled Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 411,900 | 435,200 | 439,400
Rate Adjustment Mechanism Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 6,700 | 2,100 |
Gas Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 191,400 | 203,400 | 216,100
Interest Income |  |  |  |  |  |  |  |  | 1,100 | 1,200 | 800
Interest Expense |  |  |  |  |  |  |  |  | 14,200 | 14,400 | 14,200
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 29,800 | 28,500 | 24,900
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 7,300 | 7,200 | 7,100
Segment Profit |  |  |  |  |  |  |  |  | 19,300 | 19,100 | 18,800
Segment Assets | 886,300 |  |  |  | 823,300 |  |  |  | 886,300 | 823,300 | 764,100
Capital Expenditures |  |  |  |  |  |  |  |  | 71,100 | 74,000 | 70,800
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 185,200 | 212,100 | 210,700
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 6,200 | (8,700) | 5,400
Electric |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 227,200 | 233,900 | 223,300
Interest Income |  |  |  |  |  |  |  |  | 1,100 | 900 | 800
Interest Expense |  |  |  |  |  |  |  |  | 8,700 | 9,400 | 9,000
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 23,800 | 22,600 | 23,100
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 4,700 | 4,200 | 4,200
Segment Profit |  |  |  |  |  |  |  |  | 12,900 | 11,500 | 11,400
Segment Assets | 571,800 |  |  |  | 529,300 |  |  |  | 571,800 | 529,300 | 484,200
Capital Expenditures |  |  |  |  |  |  |  |  | 45,500 | 39,600 | 28,400
Electric | Billed and Unbilled Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 226,700 | 223,100 | 228,700
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  |  |  |  |  |  |  |  | 500 | 10,800 | (5,400)
All Other Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Income |  |  |  |  |  |  |  |  | 400 | 600 | 600
Interest Expense |  |  |  |  |  |  |  |  | 3,500 | 2,800 | 3,200
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  | 900 | 900 | 2,300
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,800) | (1,400) | (3,400)
Segment Profit |  |  |  |  |  |  |  |  | 0 | 3,400 | 1,500
Segment Assets | $ 19,800 |  |  |  | 17,900 |  |  |  | 19,800 | 17,900 | 43,100
Capital Expenditures |  |  |  |  |  |  |  |  | $ 6,000 | 5,600 | 3,200
Unregulated Operation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Operating Revenue – Non-Regulated |  |  |  |  |  |  |  |  |  | 900 | 4,700
Total Operating Revenues |  |  |  |  |  |  |  |  |  | 900 | 4,700
Interest Income |  |  |  |  |  |  |  |  |  | 200 | 200
Depreciation & Amortization Expense |  |  |  |  |  |  |  |  |  |  | 100
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 3,800 | 500
Segment Profit |  |  |  |  |  |  |  |  |  | 10,200 | 1,300
Segment Assets |  |  |  |  | $ 300 |  |  |  |  | $ 300 | $ 6,900

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