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Business acquisition (Summary of Fair Values of Assets Acquired and Liabilities Assumed) (Details) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2015 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)
Fair values of the assets acquired and liabilities assumed:
Goodwill			$ 21,083	¥ 136,569
Software [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		3 years
Travel agencies [Member]
Fair values of the assets acquired and liabilities assumed:
Net liabilities				(57,032)
Goodwill				132,819
Deferred tax liability				(20,778)
Noncontrolling interest				(20,122)
Total considerations				117,997
Cash acquired		¥ 24,000
Travel agencies [Member] | Travel licenses [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets				25,100
Estimated useful lives		20 years
Travel agencies [Member] | Customer relationship [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets				13,596
Travel agencies [Member] | Customer relationship [Member] | Minimum [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		14 years 3 months
Travel agencies [Member] | Customer relationship [Member] | Maximum [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		14 years 6 months
Travel agencies [Member] | Trade names [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets				39,619
Travel agencies [Member] | Trade names [Member] | Minimum [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		7 years
Travel agencies [Member] | Trade names [Member] | Maximum [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		14 years
Travel agencies [Member] | Software [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets				3,013
Estimated useful lives		5 years
Travel agencies [Member] | Non-compete agreement [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets				¥ 1,782
Travel agencies [Member] | Non-compete agreement [Member] | Minimum [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		3 years 6 months
Travel agencies [Member] | Non-compete agreement [Member] | Maximum [Member]
Fair values of the assets acquired and liabilities assumed:
Estimated useful lives		5 years 3 months
Other acquisition [Member]
Fair values of the assets acquired and liabilities assumed:
Net liabilities	¥ (355)
Goodwill	3,750
Deferred tax liability	(1,750)
Total considerations	8,645
Other acquisition [Member] | Software [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets	¥ 5,960
Estimated useful lives	6 years
Other acquisition [Member] | Non-compete agreement [Member]
Fair values of the assets acquired and liabilities assumed:
Intangible assets	¥ 1,040
Estimated useful lives	6 years

X

- Definition

Amount of deferred tax liability attributable to taxable temporary difference, assumed at the acquisition date.

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- Definition

This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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