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Certain risks and concentration - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) | Dec. 31, 2015
Concentration Risk [Line Items] |  |  |  |
Maximum foreign ownership in internet information provider or other value-added telecommunication service provider's business allowed under PRC laws and regulations | [1] | 50.00% |  |
Retained earnings and distributable reserves |  | $ (74,526) | $ (36,704) |
Number of top customers accounted for net revenues | Customer |  | 10 |  |
Accounts Payable,Inter-companies Balance, Current |  | $ 18,704,000 | 9,360,000 |
Accrued Liabilities and Other Liabilities, Inter-companies Balance |  | $ 74,394,000 | $ 91,477,000 |
Net revenues [Member] | Customer concentration risk [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of net revenues accounted from customers |  | 27.00% | 18.00% | 26.00%
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Retained earnings and distributable reserves |  | $ 32,222,000 |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Retained earnings and distributable reserves |  |  | $ 2,541,000 |
[1] | In June 2017, the Group disposed of entire interests (10%) in Kushiduo with a carrying value of USD 383,000 at a consideration of approximately USD 191,500. As a result of the disposal, the Group recognized in a disposal loss of USD 191,500 in the other income, net (Note 23).

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