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Investments - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) Item | Dec. 31, 2017 USD ($) Item | Dec. 31, 2016 CNY (¥) Item | Dec. 31, 2015 CNY (¥) Item Investment | Dec. 31, 2017 USD ($)
Investment [Line Items] |  |  |  |  |
Time deposits and constructive notes | ¥ 1,395,694 |  | ¥ 361,499 |  | $ 214,514
Impairment loss of cost method investments | 268,432 | $ 41,258 | 129,616 | ¥ 6,031 |
Dividends received from a cost method investee | 58,741 | 9,028 | 123 | 700 |
Gain on disposal of cost method investments | 947,069 | 145,561 | 721 | 0 |
Consideration paid for equity method investments | 54,516 | 8,379 | 6,542 | 107,131 |
Aggregate consideration for equity method investments | 14,516 |  | 3,277 |  | 2,231
(Losses) gains from equity method investments | 495 | 76 | (11,363) | (12,144) |
Impairment loss of equity method investments | 0 | 0 | 11,453 | 2,806 |
Available for sale equity security, impairment loss | 6,594 | 1,013 | 0 | 25,891 |
Beijing OrionStar |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment | 403,400 |  |  |  | 62,000
Musical.ly [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Gain on disposal of cost method investments | 797,607 | $ 122,590 |  |  |
Third party mobile app developer |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment |  |  | ¥ 130,432 | ¥ 171,531 |
Cost method investment ownership percentage |  |  | 2.80% | 2.80% |
Third party mobile technique provider |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment |  |  | ¥ 80,000 |  |
Cost method investment ownership percentage |  |  | 4.60% |  |
12 internet companies |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment |  |  | ¥ 94,133 |  |
Number of equity interests acquired | Item |  |  | 12 |  |
Third party mobile advertising software provider |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment |  |  |  | ¥ 122,896 |
Cost method investment ownership percentage |  |  |  | 9.60% |
Third party e-commerce company |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment |  |  |  | ¥ 107,452 |
Cost method investment ownership percentage |  |  |  | 35.00% |
Eleven internet companies |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment |  |  |  | ¥ 72,800 |
Number of equity interests acquired | Item |  |  |  | 11 |
Dianjing |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Consideration paid for equity method investments |  |  |  | ¥ 45,000 |
Equity interest ownership percentage |  |  |  | 51.73% |
Eight internet companies |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment | ¥ 65,130 |  |  |  | 10,010
Number of equity interests acquired | Item | 8 | 8 |  |  |
Number of investments | Investment |  |  |  | 8 |
Three limited partnerships |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of investments | Investment |  |  |  | 3 |
Eight internet companies and three limited partnerships |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Consideration paid for equity method investments |  |  |  | ¥ 65,317 |
Eight internet companies and three limited partnerships | Minimum [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity interest ownership percentage |  |  |  | 5.00% |
Eight internet companies and three limited partnerships | Maximum [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity interest ownership percentage |  |  |  | 50.00% |
Bytedance Ltd. |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment | ¥ 329,710 |  |  |  | 50,000
Artificial Intelligence Technologies | Preferred Stock [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in cost method investment | ¥ 264,768 |  |  |  | $ 40,694
Cost method investment ownership percentage | 29.55% |  |  |  | 29.55%
Ziniu Fund L.P. |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Consideration paid for equity method investments | ¥ 40,000 | $ 6,148 |  |  |
Short-term Investments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Interest income, net | 16,929 | 2,602 | ¥ 6,563 | ¥ 9,877 |
Realized gain (loss) on disposal of available-for-sale equity securities | 0 | 0 | 30,625 | 13,626 |
Deemed disposal gain on equity method investments | 6,276 | $ 965 | 0 | 30,857 |
Short-term Investments [Member] | Other Income [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Realized gain (loss) on disposal of available-for-sale equity securities | 0 |  | 0 | (202) |
Impairment of investment | ¥ 0 |  | ¥ 0 | ¥ 0 |

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