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Property, plant and equipment - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Property, Plant, and Equipment Disclosure [Line Items]    
Cost of plant in service $ 559,630 $ 557,954
Accumulated depreciation related to commonly owned facilities 75,820 59,857
Expenditures 110,268 143,255
Contribution received 1,299 6,376
Generation    
Property, Plant, and Equipment Disclosure [Line Items]    
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE 111,192 114,868
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation 46,666 46,649
Depreciation expense 1,489 1,716
Regulated Services Group    
Property, Plant, and Equipment Disclosure [Line Items]    
Cost of distribution assets 3,076 3,076
Accumulated depreciation 2,041 1,665
Utility plant    
Property, Plant, and Equipment Disclosure [Line Items]    
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE 2,033,391 2,018,039
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation $ 133,644 $ 72,484