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Certain risks and concentration (Narrative) (Details) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) item | Dec. 31, 2015 CNY (¥) item | Dec. 31, 2014 CNY (¥)
Certain risks and concentration [Line Items] |  |  |
Maximum foreign ownership in internet information provider or other value-added telecommunication service provider's business allowed under PRC laws and regulations | 50.00% |  |
Number of VIEs or their shareholders entitled to terminate the contracts prior to the expiration date | 0 |  |
Number of VIEs have accumulated losses since inception | 0 |  |
Minimum [Member] |  |  |
Certain risks and concentration [Line Items] |  |  |
Term of contractual agreements | 10 years |  |
Maximum [Member] |  |  |
Certain risks and concentration [Line Items] |  |  |
Term of contractual agreements | 30 years |  |
Guangzhou Huaduo [Member] |  |  |
Certain risks and concentration [Line Items] |  |  |
Equity interests ownership (as a percent) | 100.00% |  |
Guangzhou Huaduo [Member] | Guangzhou Huanju Shidai and Beijing Huanju Shidai [Member] |  |  |
Certain risks and concentration [Line Items] |  |  |
Service fees | ¥ | ¥ 305,792 | ¥ 274,285 | ¥ 363,117
Beijing Tuda and Guangzhou Huaduo [Member] | Beijing Huanju Shidai [Member] |  |  |
Certain risks and concentration [Line Items] |  |  |
Maximum percentage of the income of VIEs which may be charged as service fees | 100.00% |  |
Maximum percentage of the profits payable by VIEs | 100.00% |  |
Accounts receivable [Member] | Credit concentration [Member] | Top 10 accounts receivable [Member] |  |  |
Certain risks and concentration [Line Items] |  |  |
Number of top accounts receivable | item | 10 | 10 |
Concentration percentage | 75.00% | 82.00% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64801991&loc=SL6759159-111685 + Details
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