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Shareholders' Equity (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
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Cumulative Effect on Retained Earnings, Net of Tax [Abstract] |  |  |
PRC statutory reserve funds | $ 64,514 | ¥ 417,911 | ¥ 375,193
Unreserved retained earnings | 11,460,904 | 74,241,444 | 47,326,133
Total retained earnings | $ 11,525,418 | ¥ 74,659,355 | ¥ 47,701,326

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