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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) mi | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2016 USD ($)
Summary Of Accounting Policies [Line Items] |  |  |  |
Number of Months to Establish ROU Asset and Liability | 12 months |  |  |
Number of Utilities that do not have cost recovery mechanism | 2 |  |  |
Delay of Revenue Recognition Due To Implementation of New Standard | $ (407) |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ (1,800) |  |  |
Maturity Period To Be Considered Cash Equivalents | 3 |  |  |
Contributions or Advances in Aid of Construction | $ 2,800 | $ 2,100 | $ 1,000 |
Property, plant and equipment in service assets under operating lease contract | 1,400 |  |  |
Annual revenue from operating lease | $ 264 |  |  |
Operating lease term | 20 years |  |  |
Accumulated depreciation, plant in service assets under operating lease | $ 720 | 652 |  |
Capital Leased Assets, Net | 1,300 | 2,100 |  |
Capital Leased Assets, Noncurrent, Fair Value Disclosure | 7,816 | 7,126 |  |
Ground Leases, Accumulated Amortization | 6,506 | 5,056 |  |
Amortization of Leased Asset | 1,451 | 1,401 | 1,353 |
Net property, plant and equipment | 1,383,972 | 1,126,027 |  |
Accumulated depreciation | 294,295 | 270,599 |  |
Depreciation and accretion reported in operations expenses | 8,500 | 8,100 | 7,300 |
Gain from a settlement | (130) | (130) | $ (130) |
Gain Contingency, Unrecorded Amount |  |  |  | $ 650
Natural Gas Operations |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Net property, plant and equipment | $ 6,670 |  |  |
Length of pipeline | mi | 16 |  |  |
Ownership interest | 45.00% |  |  |
Accumulated depreciation | $ 1,363 | $ 1,251 |  |
Minimum [Member] |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Operating Lease, Liability | 11,000 |  |  |
Operating Lease, Right-of-Use Asset | 11,000 |  |  |
Maximum |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |
Operating Lease, Liability | 13,000 |  |  |
Operating Lease, Right-of-Use Asset | $ 13,000 |  |  |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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