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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
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Sep. 30, 2011 | Jul. 31, 2011 | Dec. 31, 2012 Y | Dec. 31, 2011 | Dec. 31, 2010
Summary Of Accounting Policies [Line Items] |  |  |  |  |
Non-refundable contributions for construction received |  |  | $ 1,100,000 | $ 286,000.0 |
Allowed funds used during construction |  |  | 111,000 | 25,000 |
Property, plant and equipment in service assets under operating lease contract |  |  | 1,400,000 |  |
Annual revenue from operating lease |  |  | 264,000 |  |
Operating lease term |  |  | 20 |  |
Accumulated depreciation, plant in service assets under operating lease |  |  | 291,000 | 218,000 |
Operating lease contract date |  |  | Jan. 01, 2009 |  |
Net property, plant and equipment |  |  | 541,781,000 | 487,704,000 |
Accumulated depreciation |  |  | 155,378,000 | 137,784,000 |
Proceeds from sale of Internet Protocol address asset |  | 553,000 |  |  |
Non-operating pre-tax gain on sale of Internet Protocol address asset |  | 553,000 | (93,000) | 453,000 | (113,000)
Agreement for sale of office building | 2,200,000 |  | 2,279,000 | 937,000 | 113,000
Purchase price allocated to parcel |  |  | 600,000 |  |
Depreciation and accretion reported in operations expenses |  |  | 5,500,000 | 5,100,000 | 4,400,000
Deferred revenue refund payment, period |  |  | 1 year |  |
Investment with an original maturity period |  |  | Three months or less |  |
Pension benefit [Member] |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |
Percentage of change in discount rate |  |  | 0.25% |  |
Estimated increase in annual pension and postretirement costs |  |  | 11,000 |  |
Estimated decrease in annual pension and postretirement costs |  |  | 13,000 |  |
Pensions and other employee benefits [Member] |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |
Percentage of change in rate of return |  |  | 0.25% |  |
Estimated change in annual post retirement and supplemental executive retirement plans |  |  | 124,000 |  |
Natural gas transmission operation [Member] |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |
Net property, plant and equipment |  |  | 6,700,000 |  |
Length of pipeline |  |  | 16 |  |
Ownership interest |  |  | 45.00% |  |
Accumulated depreciation |  |  | $ 28,000 |  |

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- Definition The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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