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Related Party Transactions - Summary of Outstanding Balances with Related Parties (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Joint operations [member] | Loans [member]    
Disclosure of transactions between related parties [line items]    
Amounts owing to related parties $ 40,513 $ 55,667
Amounts owing from related parties 15,474 18,089
Associates [member] | Trade payables [member]    
Disclosure of transactions between related parties [line items]    
Amounts owing to related parties 169,773 210,716
Associates [member] | Loans [member]    
Disclosure of transactions between related parties [line items]    
Amounts owing to related parties 10,097 4,097
Amounts owing from related parties 33,486 12,939
Associates [member] | Trade receivables [member]    
Disclosure of transactions between related parties [line items]    
Amounts owing from related parties $ 3,828 $ 3,932