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Summary of Significant of Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 Segment | Dec. 31, 2017 CNY (¥) Item Segment | Dec. 31, 2017 USD ($) Item Segment | Dec. 31, 2016 CNY (¥) Segment | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 29, 2017 CNY (¥) | Dec. 29, 2017 USD ($) | Jan. 01, 2017 CNY (¥) | Jan. 01, 2017 USD ($) | Mar. 17, 2014 | Apr. 16, 2012 | Apr. 15, 2012
Restricted cash |  | ¥ 90,149,000 |  | ¥ 167,751,000 |  | $ 13,856,000 |  |  |  |  |  |  |
Cash pledged as collateral for a short-term bank loan |  | 65,342,000 |  | 69,370,000 |  | 10,043,000 |  |  |  |  |  |  |
Cash reserved in third-party trust account |  | ¥ 17,681,000 |  | ¥ 0 |  | 2,718,000 |  |  |  |  |  |  |
Number of reporting segment | Segment | 3 | 3 | 3 | 1 |  |  |  |  |  |  |  |  |
Number of pricing models | Item |  | 3 | 3 |  |  |  |  |  |  |  |  |  |
VAT, business taxes and surcharges |  | ¥ 114,160,000 | $ 17,546,000 | ¥ 138,105,000 | ¥ 138,088,000 |  |  |  |  |  |  |  |
VAT rate one |  | 6.00% | 6.00% |  |  |  |  |  |  |  |  |  |
VAT rate two |  | 17.00% | 17.00% |  |  |  |  |  |  |  |  |  |
Advertising and promotional expenses |  | ¥ 1,380,913,000 | $ 212,242,000 | 1,328,910,000 | 1,322,844,000 |  |  |  |  |  |  |  |
Capitalized software development costs |  | 722,000 |  | 2,505,000 | ¥ 0 | 111,000 |  |  |  |  |  |  |
Capital lease | ¥ |  | 0 |  | ¥ 0 |  |  |  |  |  |  |  |  |
Cash and cash equivalent,Restricted Cash and Short term investment |  | ¥ 3,803,331,000 |  |  |  | 584,561,000 |  |  |  |  |  |  |
Maximum ownership percentage in ICP business |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |
Maximum daily floating range of RMB trading prices against the US dollar (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.00% | 1.00% | 0.50%
Appreciation (depreciation) rate of foreign currency exchange (as a percent) |  | 6.30% | 6.30% | 6.20% | 5.80% |  |  |  |  |  |  |  |
Facebook | Total Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 11.00% | 11.00% | 20.00% | 29.00% |  |  |  |  |  |  |  |
Baidu | Total Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 11.00% | 11.00% | 12.00% | 10.00% |  |  |  |  |  |  |  |
Tencent | Total Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Google | Total Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 15.00% | 15.00% | 6.00% |  |  |  |  |  |  |  |  |
PRC |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and short term investments |  | 42.50% | 42.50% |  |  |  |  |  |  |  |  |  |
Non-PRC |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and short term investments |  | 57.50% | 57.50% |  |  |  |  |  |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment in retained earnings |  |  |  |  |  |  |  |  | ¥ 6,886,000 | $ 1,058,000 |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | ¥ 3,309,000 |  | ¥ 94,180,000 |  | $ 509,000 |  |  |  |  |  |  |
Cross Currency Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Noon buying rate |  |  |  |  |  |  | ¥ 6.5063 | $ 1.0000 |  |  |  |  |

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