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Total Share-Based Compensation Cost Recognized (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Capitalized as part of internal-used software | $ 31 | ¥ 214 | ¥ 1,381 | ¥ 0
Cost of revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 14,886 | 103,354 | 49,770 | 34,611
Selling, general and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 61,823 | 429,234 | 486,760 | 426,052
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | $ 176,782 | ¥ 1,227,400 | ¥ 850,588 | ¥ 502,077

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