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Long-term investments - Schedule of Long-Term Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Long-term investments carried at fair value $ 1,097,661 $ 814,530 $ 1,097,661
Other long-term investments      
Equity-method investees 50,486 30,492 $ 50,486
Notes receivable from equity-method investees 9,997 101,416  
Other 2,247 3,870  
Other long-term investments 62,730 135,778  
Less: current portion (1,347) (1,407)  
Other long-term investments 61,383 134,371  
Atlantica      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Long-term investments carried at fair value 1,018,837 814,530  
AYES Canada      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Long-term investments carried at fair value 78,824 0  
Amherst Island Wind Project      
Other long-term investments      
Equity-method investees 0 7,655  
San Antonio Water System      
Other long-term investments      
Equity-method investees 18,231 0  
Red Lily I Wind Facility      
Other long-term investments      
Equity-method investees 17,284 15,705  
AAGES      
Other long-term investments      
Equity-method investees 1,299 2,622  
Other      
Other long-term investments      
Equity-method investees $ 13,672 $ 4,510