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Segment Information - Summary of Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Revenue $ 915,353 $ 859,543
Adjusted Gross Profit 400,777 388,196
Adjusted EBITDA 297,561 287,480
Depreciation and amortization 105,670 96,283
Adjusted Capital Expenditures 105,414 95,429
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 375,739 356,112
Depreciation and amortization 59,245 54,323
Adjusted Capital Expenditures 88,435 83,390
Operating Segments [Member] | Travel Network [Member]    
Segment Reporting Information [Line Items]    
Revenue 663,477 625,476
Adjusted Gross Profit 319,018 304,914
Adjusted EBITDA 290,222 273,174
Depreciation and amortization 20,468 18,530
Adjusted Capital Expenditures 26,273 22,970
Operating Segments [Member] | Airline And Hospitality Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue 257,976 238,380
Adjusted Gross Profit 105,348 100,876
Adjusted EBITDA 85,517 82,938
Depreciation and amortization 38,777 35,793
Adjusted Capital Expenditures 62,162 60,420
Eliminations [Member]    
Segment Reporting Information [Line Items]    
Revenue (6,100) (4,313)
Corporate [Member]    
Segment Reporting Information [Line Items]    
Adjusted Gross Profit (23,589) (17,594)
Adjusted EBITDA (78,178) (68,632)
Depreciation and amortization 46,425 41,960
Adjusted Capital Expenditures $ 16,979 $ 12,039