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Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]    
Deposit for business acquisition $ 0 $ 371,756
Deposits 10,722 8,606
Strategic investments 4,064 18,056
Long-term forward foreign currency exchange contract assets 8,194 3,533
Other 9,835 6,693
Total other assets $ 32,815 $ 408,644