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Geographical Information - Schedule of Revenues and Property and Equipment (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
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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.

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