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Property, plant and equipment - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Property, Plant, and Equipment Disclosure [Line Items]      
U.S. Tax reform $ 159,568    
Contribution received   $ 238 $ 1,299
Generation      
Property, Plant, and Equipment Disclosure [Line Items]      
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE 111,192 117,556 111,192
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation 46,666 52,506 46,666
Depreciation expense   537 1,489
Regulated Services Group      
Property, Plant, and Equipment Disclosure [Line Items]      
Cost of distribution assets 3,076 3,270 3,076
Accumulated depreciation 2,041 2,455 2,041
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 1,922,844 2,033,391
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation 133,644 $ 141,466 $ 133,644
Maximum      
Property, Plant, and Equipment Disclosure [Line Items]      
U.S. Tax reform 259,942    
Minimum      
Property, Plant, and Equipment Disclosure [Line Items]      
U.S. Tax reform $ 100,374