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Investment in Equity Investees (Detail) ¥ in Thousands, $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2013 CNY (¥)	Apr. 30, 2012 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 CNY (¥)
Schedule of Equity Method Investments [Line Items]
Investment in an equity investee, addition				¥ 162,176	¥ 49,000
Share equity gain, during period			$ 8,266	53,783	35,652	¥ 52,355
Cost investment					150,000	101,000	¥ 312,176
Accumulated, share equity gain (loss)					84,863	49,211	138,646
Investment in equity investee			69,290		234,863	150,211	450,822
Yizhuang Venture Investment Fund
Schedule of Equity Method Investments [Line Items]
Investment in an equity investee, addition	¥ 50,500	¥ 50,500
Share equity gain, during period				90,888	35,937
Cost investment					101,000	101,000	101,000
Accumulated, share equity gain (loss)					85,148	49,211	176,036
Investment in equity investee			42,580		186,148	¥ 150,211	277,036
Unis Tech
Schedule of Equity Method Investments [Line Items]
Investment in an equity investee, addition					49,000
Share equity gain, during period				(12,676)	(285)
Cost investment					49,000		49,000	$ 7,057	¥ 49,000
Accumulated, share equity gain (loss)					(285)		(12,961)
Investment in equity investee			5,539		¥ 48,715		36,039
Shihua DC Investment Holdings Limited
Schedule of Equity Method Investments [Line Items]
Investment in an equity investee, addition				147,176
Share equity gain, during period				(9,429)
Cost investment							147,176
Accumulated, share equity gain (loss)							(9,429)
Investment in equity investee			$ 21,171				137,747
WiFire Group Inc. ("WiFire Group")
Schedule of Equity Method Investments [Line Items]
Investment in an equity investee, addition				15,000
Share equity gain, during period				¥ (15,000)
Cost investment							15,000
Accumulated, share equity gain (loss)							¥ (15,000)

X

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Accumulated Income (Loss) from Equity Method Investments

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