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Property, plant and equipment - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Property, Plant, and Equipment Disclosure [Line Items] |  |
Cost of plant in service | $ 514,709 | $ 503,664
Accumulated depreciation related to commonly owned facilities | 31,349 | 21,697
Expenditures | 69,210 | 75,427
Contribution received | 7,137 | 6,057
Generation |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE | 109,653 | 104,107
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation | 39,638 | 34,916
Depreciation expense | 1,615 | 1,987
Distribution |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE | 1,450,946 | 1,383,960
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation | 97,080 | 69,960
Regulated Services Group |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |
Cost of distribution assets | 3,076 | 3,076
Accumulated depreciation | 1,003 | $ 669
Regulated Services Group |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |
Expansion costs | $ 1,000 |

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- Definition Capital Leased Assets and Plant Property and Equipment Owned by Consolidated VIE, Accumulated Depreciation + References No definition available. + Details
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- Definition Capital Leased Assets and Plant Property and Equipment Owned by Consolidated VIE, Gross + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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