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Share-based compensation - Share-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses $ 2,593 $ 11,071 $ 27,568 $ 27,702
Share-based compensation capitalized in intangible assets     364 373
Share-based compensation expenses, Total 2,674 11,492 28,113 28,704
Selling and Marketing Expense        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 728 1,024 2,203 2,428
General and Administrative Expenses        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 1,865 9,484 4,243 23,028
Spin-off Transaction Costs        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 0 0 5,409 0
Discontinued Operations        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation expenses 0 563 15,713 2,246
Share-based compensation capitalized in intangible assets 0 236 181 629
Continuing Operations        
Share Based Compensation Expense Recognized [Line Items]        
Share-based compensation capitalized in intangible assets $ 81 $ 185 $ 364 $ 373