Disposition of Business - Carrying Amounts of Assets and Liabilities Disposed Of (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	May 22, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-redeemable noncontrolling interest divested	$ 1,560,802	$ 65,373
Disposal Group, Not Discontinued Operations | eLong, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets			$ 350,196
Total long-term assets			137,709
Total assets divested			487,905
Total current liabilities			187,296
Total long-term liabilities			5,782
Total liabilities divested			193,078
Components of accumulated other comprehensive income divested			45,259
Non-redeemable noncontrolling interest divested			92,550
Net carrying value divested			157,018
Cash and cash equivalents			$ 74,000