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Reconciliation of Available-For-Sale Debt Investments at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Detail) - 12 months ended Dec. 31, 2015 - Fair Value, Inputs, Level 3 - Available For Sale Debt Securities - Fair Value, Measurements, Recurring ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Schedule of Available-for-sale Securities [Line Items]
Balance as of January 1, 2015	$ 42,095	¥ 272,680
Reclassification as a cost method investment	$ (42,095)	¥ (272,680)

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- Definition

Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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+ References

No definition available.

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