Investment in Subsidiaries - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of subsidiaries [line items]
Profit (loss) allocated to non-controlling interests	$ (11,453)	$ (2,725)
Non-Material Subsidiaries [member]
Disclosure of subsidiaries [line items]
Profit (loss) allocated to non-controlling interests	$ (21)	$ 1,950

The profit (loss) attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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