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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of retained earnings |
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
PRC statutory reserve funds |  |  | 31,824 |  |  |  | 39,638 |  |  |  | 6,092 |
Unreserved retained earnings |  |  | 205,469 |  |  |  | 1,525,245 |  |  |  | 234,426 |
Total retained earnings |  |  | 237,293 |  |  |  | 1,564,883 |  |  |  | 240,518 |
Schedule of components of accumulated other comprehensive income |
|  | Foreign currency translation adjustments |  |  | Unrealized gains on available- for-sale securities |  |  | Total |
|  |  |  |  | RMB |  |  | RMB |
Balance at January 1,2015 |  |  | (15,726 | ) |  |  | 17,927 |  |  |  | 2,201 |
Other comprehensive income before reclassification |  |  | 115,515 |  |  |  | 9,729 |  |  |  | 125,244 |
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (6,814 | ) |  |  | (6,814 | )
Other comprehensive loss attribute to noncontrolling interests |  |  | (1,515 | ) |  |  | — |  |  |  | (1,515 | )
Balance at December 31, 2015 |  |  | 98,274 |  |  |  | 20,842 |  |  |  | 119,116 |
Other comprehensive income before reclassification |  |  | 132,450 |  |  |  | 1,241 |  |  |  | 133,691 |
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | (21,666 | ) |  |  | (21,666 | )
Other comprehensive loss attribute to noncontrolling interests |  |  | (2,996 | ) |  |  | — |  |  |  | (2,996 | )
Balance at December 31, 2016 |  |  | 227,728 |  |  |  | 417 |  |  |  | 228,145 |
Other comprehensive income before reclassification |  |  | (148,304 | ) |  |  | (433 | ) |  |  | (148,737 | )
Other comprehensive loss attribute to noncontrolling interests |  |  | 4,798 |  |  |  | — |  |  |  | 4,798 |
Balance at December 31, 2017 |  |  | 84,222 |  |  |  | (16 | ) |  |  | 84,206 |
Balance at December 31, 2017, in US$ |  |  | 12,945 |  |  |  | (2 | ) |  |  | 12,943 |

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- Definition Tabular disclosure of retain earnings. + References No definition available. + Details
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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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