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Intangible Asset and Related Accumulated Amortization (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | ¥ 517,300 |  | ¥ 587,563
Accumulated amortization | (374,110) |  | (324,693)
Accumulated impairment | (72,965) |  | (35,619)
Net carrying value, finite-lived | 70,225 | $ 10,793 | 227,251
Technology |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 228,374 |  | 208,716
Accumulated amortization | (172,976) |  | (149,176)
Net carrying value, finite-lived | 55,398 | 8,514 | 59,540
Online game licenses |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 66,992 |  | 69,198
Accumulated amortization | (28,496) |  | (26,622)
Accumulated impairment | (34,608) |  | (35,619)
Net carrying value, finite-lived | 3,888 | 598 | 6,957
Customer relationship |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived |  |  | 94,160
Accumulated amortization |  |  | (31,759)
Net carrying value, finite-lived |  |  | 62,401
User base |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 74,871 |  | 79,438
Accumulated amortization | (74,871) |  | (73,368)
Net carrying value, finite-lived |  |  | 6,070
Trademarks |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 20,533 |  | 45,709
Accumulated amortization | (14,854) |  | (11,437)
Accumulated impairment | (1,198) |  |
Net carrying value, finite-lived | 4,481 | 689 | 34,272
Domain names |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 4,247 |  | 3,317
Accumulated amortization | (2,567) |  | (1,990)
Net carrying value, finite-lived | 1,680 | 258 | 1,327
Noncompete Agreements |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 1,610 |  | 8,547
Accumulated amortization | (1,610) |  | (3,633)
Net carrying value, finite-lived |  |  | 4,914
Platform |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 71,885 |  | 76,317
Accumulated amortization | (39,532) |  | (26,708)
Accumulated impairment | (32,344) |  |
Net carrying value, finite-lived | 9 | 1 | 49,609
Customer relationship |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, finite-lived | 46,627 |  |
Accumulated amortization | (39,204) |  |
Accumulated impairment | (2,654) |  |
Net carrying value, finite-lived | 4,769 | $ 733 |
Trade name and domain names |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying value, indefinite-lived | 2,161 |  | 2,161
Accumulated impairment | ¥ (2,161) |  |
Net carrying value, indefinite-lived |  |  | ¥ 2,161

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