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Investments in equity investees (Narrative) (Details) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2015 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2016 USD ($)
Investments in equity investees [Line Items]
Cost Method Investments		¥ 33,443		¥ 13,307		$ 4,817
Equity Method Investment, Ownership Percentage	50.00%			10.00%
Equity Method Investment Ownership Percentage Disposed				40.00%
Payments to Acquire Equity Method Investments	¥ 10,562	0		¥ 10,562
Income (Loss) from Equity Method Investments				(10,236)
Proceeds from Sale of Equity Method Investments				10,000
Equity Method Investment, Realized Gain (Loss) on Disposal				9,674
Parent Company [Member]
Investments in equity investees [Line Items]
Cost Method Investments		¥ 6,682		¥ 6,682		$ 962
Equity Method Investment, Ownership Percentage		51.00%				51.00%
Xizhong Holding Co., Ltd [Member]
Investments in equity investees [Line Items]
Equity Method Investment, Ownership Percentage		49.00%				49.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting disposed.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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Amount of gain (loss) on sale or disposal of an equity method investment.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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