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Geographical Information - Schedule of Revenues and Property and Equipment (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue ¥ 4,974,757 $ 764,606 ¥ 4,564,650 ¥ 3,773,877  
PRC          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 1,639,248 251,948 1,817,874 1,840,290  
Property and equipment, net 83,628   109,846   $ 12,853
Non-PRC.          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue [1] 3,335,509 512,658 2,746,776 1,933,587  
Property and equipment, net 5,509   7,593   $ 847
UNITED STATES          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 2,071,646 318,406 977,257 282,543  
IRELAND          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue [2] 553,028 84,999 911,154 1,086,110  
Rest of the world          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue [3] ¥ 710,835 $ 109,253 ¥ 858,365 ¥ 564,934  
[1] Non-PRC revenue refers to revenues generated by the Group's operating legal entities incorporated outside China. Such revenues are primarily attributable to customers located outside China based on customers' registered addresses.
[2] Revenues from Ireland were primarily derived from online advertising service from Facebook, which is incorporated in Ireland but operates primarily in the United States, representing 11% of the Group's total revenue for the year ended December 31, 2017.
[3] No individual country, other than disclosed above, exceeded 10% of total revenues for any period presented.