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Intangible assets, net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Write-off of long-lived assets   $ 3,626
Amortization expenses $ 3,208 3,111
Software Developed for Internal Use [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets that have not started amortization $ 1,317  
Q Interactive Acquisition [Member] | Acquired Proprietary Technology and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Write-off of long-lived assets   $ 3,626