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Related parties' transactions - Schedule of Amounts Payable to Related Parties (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Disclosure of amount payables to related parties [line items]    
Compensation $ 4,754 $ 1,477
Compensation [member]    
Disclosure of amount payables to related parties [line items]    
Compensation 4,588 940
Pension obligation [member]    
Disclosure of amount payables to related parties [line items]    
Compensation $ 166 $ 538