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Principal Accounting Policies (Narrative - Goodwill, Revenue Recognition, Cost of Revenues, Leases, Share-based compensation) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2015 CNY (¥)
Revenue Recognition
Minimum maturity period for yield enhancement products	3 months	3 months
Maximum maturity period for yield enhancement products	2 years	2 years
Maximum maturity period for new yield enhancement products	1 year	1 year
Yield enhancement products purchased by the Group, current portion	$ 62,905				¥ 407,487
Yield enhancement products purchased by the Group, non-current portion	46,353				300,267
Interest revenue		¥ 8,740
Yield enhancement products held by the individual investors, current portion	90,949				589,151
Interest cost		8,082
Liabilities recorded related to membership points and cash rewards	$ 5,346		¥ 14,764		34,633
Cost of Revenues
Losses of committed tour reservations		17,780	4,134	¥ 6,682
Advertising Expenses
Advertising expense		899,015	379,205	¥ 103,142
Leases
Deferred rent ,current liabilities			4,244		16,741
Deferred rent ,non-current liabilities			¥ 22,278		¥ 18,035
Goodwill
Impairment loss		¥ 0
2008 Plan [Member]
Share-based compensation [Line Items]
Award service period	4 years	4 years
Terminate period prior to the occurrence of an exercisable event	3 months	3 months

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- Definition

Represents the carrying value as of the balance sheet date of obligations incurred and payable for customer incentive programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer).

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Represents the carrying value as of the balance sheet date of Yield enhancement products from Exchange and trust companies. Used to reflect the current portion of the assets.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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