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CAPITAL AND TREASURY STOCK (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) shares | Sep. 30, 2016 CNY (¥) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2017 CNY (¥) shares
CAPITAL AND TREASURY STOCK |  |  |  |  |  |  |  |  |
Amount of convertible notes early converted |  |  | $ 368,221,572 | ¥ 2,395,760,015 |  | ¥ 2,604,871,611 |  | ¥ 118,973,721 |
Treasury stock delivered to the notes holders, per early conversion (in shares) | shares |  |  | 318,170 | 318,170 | 330,048 | 330,048 | 244,466 | 244,466 |
Treasury stock, shares | shares |  |  | 2,929,139 |  |  | 3,247,309 |  |  | 2,929,139
Treasury stock at cost |  |  | $ 324,427,189 |  |  | ¥ 2,235,574,510 |  |  | ¥ 2,110,820,623
Convertible Senior Notes |  |  |  |  |  |  |  |  |
CAPITAL AND TREASURY STOCK |  |  |  |  |  |  |  |  |
Amount of convertible notes early converted | $ |  |  | 19,600,000 |  | $ 21,600,000 |  | $ 16,500,000 |  |
ADS |  |  |  |  |  |  |  |  |
CAPITAL AND TREASURY STOCK |  |  |  |  |  |  |  |  |
Issuance cost | ¥ |  | ¥ 226,000,000 |  |  |  |  |  |  |
ADS | Over allotment option |  |  |  |  |  |  |  |  |
CAPITAL AND TREASURY STOCK |  |  |  |  |  |  |  |  |
Aggregate number of ADS shares | shares | 32,775,000 | 32,775,000 |  |  |  |  |  |  |
Additional number of shares | shares | 4,275,000 | 4,275,000 |  |  |  |  |  |  |
Aggregate amount of offering price | $ | $ 1,500,000,000 |  |  |  |  |  |  |  |
Baidu | ADS |  |  |  |  |  |  |  |  |
CAPITAL AND TREASURY STOCK |  |  |  |  |  |  |  |  |
Aggregate investment amount | $ |  |  | 100,000,000 |  |  |  |  |  |
Priceline Group | ADS |  |  |  |  |  |  |  |  |
CAPITAL AND TREASURY STOCK |  |  |  |  |  |  |  |  |
Aggregate investment amount | $ |  |  | $ 25,000,000 |  |  |  |  |  |

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