Total Number Of Directors Elected By Holders Of Common Stock, Voting As Single Class, Percentage

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Number Of Voting Rights To Each Preferred Shareholder

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Face amount or stated value per share of common stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 02
-Paragraph 30
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
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The month and year (YYYY-MM) that the dividend to be paid was declared.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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

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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 02
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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Stockholders Equity - Additional Information (Detail)		12 Months Ended
Stockholders Equity - Additional Information (Detail)	Feb. 10, 2016 $ / shares	Dec. 31, 2015 Vote / shares $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2012 shares	Dec. 31, 2010 shares	Dec. 31, 2006 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and remaining under the repurchase program		11,200,000
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized		400,000,000	400,000,000
Common stock, par value \| $ / shares		$ 0.0001	$ 0.0001
Number of voting rights to each shareholder, per share \| Vote / shares		10
Series A Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock outstanding		0	0
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized		1,600,000,000	1,600,000,000
Common stock, par value \| $ / shares		$ 0.0001	$ 0.0001
Number of voting rights to each shareholder, per share \| Vote / shares		1
Total number of directors elected by holders of common stock, voting as single class, percentage		25.00%
eLong, Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership interest percentage			64.00%
AirAsia Expedia
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Owned equity investments percentage		75.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized share repurchase		10,000,000		20,000,000	20,000,000	20,000,000
Fiscal Year 2015, 2012, 2010, and 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized share repurchase		70,000,000
Subsequent Event \| Dividend Declared
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration Date	2016-02
Dividend Per Share \| $ / shares	$ 0.24
Payment Date	Mar. 30, 2016
Record Date	Mar. 10, 2016