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Pro forma Summary of Operation (Detail) - Eat24, Foodler and LABite - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Revenues $ 748,810 $ 578,462
Net income $ 86,313 $ 27,318
Net income per share attributable to common shareholders:    
Basic $ 1.00 $ 0.32
Diluted $ 0.98 $ 0.32