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Schedule of Prepayments and Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments	$ 147,015	$ 131,642
Prepaid taxes	13,404	9,646
Prepaid maintenance and other services	7,703	8,487
Other prepayments	16,111	12,744
Total prepayments	$ 184,233	$ 162,519

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