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SHAREHOLDERS' EQUITY (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 $ / shares | Dec. 31, 2014 CNY (¥) shares | May. 31, 2014 $ / shares shares
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |
Ordinary shares, shares authorized | shares |  |  |  |  |  |  |  | 10,000,000,000
Preferred shares issued | shares | 0 |  |  |  | 0 |  | 0 |
Preferred shares outstanding | shares | 0 |  |  |  | 0 |  | 0 |
Retained Earnings Note Disclosure [Abstract] |  |  |  |  |  |  |  |
Allocations to general reserve as a percentage of profit after tax | 10.00% | 10.00% |  |  |  |  |  |
Threshold percentage of general reserve required to be maintained threshold percentage of general reserve required to be maintained | 50.00% | 50.00% |  |  |  |  |  |
Appropriation to statutory common reserve | 10.00% | 10.00% |  |  |  |  |  |
Threshold percentage of statutory common reserve required to be maintained | 50.00% | 50.00% |  |  |  |  |  |
PRC statutory reserve funds | $ 4,187 |  |  |  | ¥ 27,121 |  | ¥ 25,762 |
Unreserved retained earnings | 45,112 |  |  |  | 292,235 |  | 116,998 |
Total retained earnings | 49,299 |  |  |  | 319,356 |  | 142,760 |
Net assets restricted to transfer | 158,607 |  |  |  | ¥ 1,027,423 |  | ¥ 432,351 |
Accumulated other comprehensive income |  |  |  |  |  |  |  |
Balance at the beginning of the period | ¥ |  | ¥ 3,373 | ¥ 13,239 | ¥ (1,603) |  |  |  |
Other comprehensive income(loss) before reclassification | ¥ |  | 127,706 | (31,085) | 14,842 |  |  |  |
Amounts reclassified from accumulated other comprehensive income | ¥ |  | (6,814) | 21,121 |  |  |  |  |
Other comprehensive loss attribute to noncontrolling interests | ¥ |  | (470) | 98 |  |  |  |  |
Including: reclassification adjustments for gains included in the consolidated statement of comprehensive income | (1,052) | (6,814) | (21,121) |  |  |  |  |
Balance at the end of the period | 19,111 | 123,795 | 3,373 | 13,239 |  |  |  |
Other Comprehensive Income (Loss), Tax | ¥ |  | 0 | 0 |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  |  |  |  |
Balance at the beginning of the period | ¥ |  | (14,552) | (7,690) | (1,603) |  |  |  |
Other comprehensive income(loss) before reclassification | ¥ |  | 117,977 | (6,960) | (6,087) |  |  |  |
Other comprehensive loss attribute to noncontrolling interests | ¥ |  | (470) | 98 |  |  |  |  |
Balance at the end of the period | 15,894 | 102,955 | (14,552) | (7,690) |  |  |  |
Unrealized gains on available-for-sales investments |  |  |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  |  |  |  |
Balance at the beginning of the period | ¥ |  | 17,925 | 20,929 |  |  |  |  |
Other comprehensive income(loss) before reclassification | ¥ |  | 9,729 | (24,125) | 20,929 |  |  |  |
Amounts reclassified from accumulated other comprehensive income | ¥ |  | (6,814) | 21,121 |  |  |  |  |
Balance at the end of the period | $ 3,217 | ¥ 20,840 | ¥ 17,925 | ¥ 20,929 |  |  |  |
Class A Ordinary shares |  |  |  |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares | 365,961,759 |  |  |  | 365,961,759 |  | 288,988,560 |
Ordinary shares, shares outstanding | shares | 350,398,737 |  |  |  | 350,398,737 |  | 260,045,912 |
Ordinary shares, shares authorized | shares | 7,600,000,000 |  |  |  | 7,600,000,000 |  | 7,600,000,000 | 7,600,000,000
Ordinary shares, par value (in dollars per share) | $ / shares | $ 0.000025 |  |  |  |  | $ 0.000025 |  |
Class B Ordinary shares |  |  |  |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |
Ordinary shares, shares issued | shares | 1,058,514,152 |  |  |  | 1,058,514,152 |  | 1,127,614,152 | 224,905,170
Ordinary shares, shares outstanding | shares | 1,035,037,339 |  |  |  | 1,035,037,339 |  | 1,095,456,652 |
Ordinary shares, shares authorized | shares | 1,400,000,000 |  |  |  | 1,400,000,000 |  | 1,400,000,000 | 1,400,000,000
Ordinary shares, par value (in dollars per share) | $ / shares | $ 0.000025 |  |  |  |  | $ 0.000025 |  |
Shares transferred | shares | 691,000,000 | 691,000,000 | 86,330,627 |  |  |  |  |
Reserved Shares |  |  |  |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |
Ordinary shares, shares authorized | shares |  |  |  |  |  |  |  | 1,000,000,000
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.000025

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