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Disposition of Business - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 22, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Pre-tax gain on disposal of business |  | $ 0 | $ 0 | $ 508,810
Disposal Group, Not Discontinued Operations | eLong, Inc |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage of ownership sold | 62.40% |  |  |
Consideration of business sold | $ 671,000 |  |  |
Consideration of business sold, net of costs to sell | $ 666,000 |  |  |
Pre-tax gain on disposal of business |  |  |  | 508,810
Gain on disposal of business, after-tax |  |  |  | 395,000
Disposal Group, Not Discontinued Operations | eLong, Inc | Long-term investments and other assets |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Held in escrow |  |  |  | $ 67,000

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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