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Biological Asset - Summary Of Biological Asset (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in biological assets [line items]      
Biological asset $ 4,230 $ 4,405  
Change in biological asset (834) 265  
Estimated sales value - biological asset [member]      
Disclosure of reconciliation of changes in biological assets [line items]      
Biological asset 8,004 7,937  
Estimated selling costs [member]      
Disclosure of reconciliation of changes in biological assets [line items]      
Biological asset 470 489  
Actual costs [member]      
Disclosure of reconciliation of changes in biological assets [line items]      
Biological asset (2,871) (2,212)  
Fair value over cost [member]      
Disclosure of reconciliation of changes in biological assets [line items]      
Biological asset 1,359 2,193 $ 1,928
Estimated remaining costs to complete [member]      
Disclosure of reconciliation of changes in biological assets [line items]      
Biological asset $ 3,304 $ 3,043