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Property, plant and equipment - Schedule of Plant, Property and Equipment (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Cost | $ 8,417,772 | $ 7,406,319
Accumulated depreciation | 1,186,108 | 1,012,761
Net book value | 7,231,664 | 6,393,558
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 74,517 | 73,773
Accumulated depreciation | 0 | 0
Net book value | 74,517 | 73,773
Equipment and other |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 94,583 | 88,757
Accumulated depreciation | 47,541 | 41,295
Net book value | 47,042 | 47,462
Generation |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 2,816,611 | 2,470,279
Accumulated depreciation | 540,118 | 450,230
Net book value | 2,276,493 | 2,020,049
Generation | Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 140,235 | 104,996
Accumulated depreciation | 0 | 0
Net book value | 140,235 | 104,996
Liberty Utilities Group |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 4,988,297 | 4,455,935
Accumulated depreciation | 598,449 | 521,236
Net book value | 4,389,848 | 3,934,699
Liberty Utilities Group | Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 303,529 | 212,579
Accumulated depreciation | 0 | 0
Net book value | $ 303,529 | $ 212,579

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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 (b) -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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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