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Shareholders' Equity - Schedule of Retained Earnings (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
PRC statutory reserve funds | ¥ 39,638 | $ 6,092 | ¥ 31,824
Unreserved retained earnings | 1,525,245 | 234,426 | 205,469
Total retained earnings | ¥ 1,564,883 | $ 240,518 | ¥ 237,293

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