Non-controlling interests - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of subsidiaries [line items]
Profit (loss) allocated to non-controlling interests	$ (17,747)	$ (11,453)
Carrying amount of NCI	63,414	79,940
Non-Material Subsidiaries [member]
Disclosure of subsidiaries [line items]
Profit (loss) allocated to non-controlling interests	84	21
Carrying amount of NCI	$ 1,626	$ 1,289

The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]]

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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