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Share-based payments - Share-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation expenses $ 9,319 $ 7,245 $ 16,631 $ 14,623
Capitalized in intangible assets 335 221 581 499
Share-based compensation expenses, Total 9,654 7,466 17,212 15,122
Selling and Marketing Expense [Member]        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation expenses 868 575 1,566 1,121
General and Administrative Expenses [Member]        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation expenses $ 8,451 $ 6,670 $ 15,065 $ 13,502