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Excess of Carrying Value of Equity Method Investment (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in Ctrip	$ 4,410,000	¥ 28,540,000	¥ 869,150
Ctrip.com International, Ltd
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in Ctrip	4,115,956	26,662,337
Proportionate share of net assets of Ctrip	(1,319,975)	(8,550,531)
Excess of carrying value of investment over proportionate share of net assets	2,795,981	18,111,806
The excess carrying value has been primarily assigned to:
Goodwill	2,402,533	15,563,126
Intangible assets	439,205	2,845,081
Deferred income taxes	(43,716)	(283,187)
Property, plant and equipment	8,077	52,323
Land use rights	2,082	13,487
Equity investments	(12,200)	(79,024)
Excess of carrying value of investment over proportionate share of net assets	$ 2,795,981	¥ 18,111,806

X

- Definition

This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to deferred income taxes.

+ References

No definition available.

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- Definition

This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to equity investment.

+ References

No definition available.

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- Definition

This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to goodwill.

+ References

No definition available.

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- Definition

This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to intangible assets.

+ References

No definition available.

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- Definition

This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to land use rights.

+ References

No definition available.

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- Definition

This item represents the difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee allocated to property, plant and equipment.

+ References

No definition available.

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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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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
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 2: 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

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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