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Segment Information - Summary of Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Revenue $ 984,376 $ 900,663 $ 1,972,745 $ 1,816,016
Adjusted Gross Profit 373,678 368,578 778,257 769,355
Adjusted Operating Income 171,986 172,498 369,582 383,438
Adjusted EBITDA 277,002 261,417 578,340 558,978
Depreciation and amortization 102,943 93,017 204,819 198,687
Adjusted Capital Expenditures 67,187 79,092 131,886 167,410
Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 324,169 308,933 671,934 644,303
Depreciation and amortization 83,728 72,047 167,344 142,858
Adjusted Capital Expenditures 44,733 64,861 93,547 136,200
Operating Segments | Travel Network        
Segment Reporting Information [Line Items]        
Revenue 719,685 635,615 1,440,821 1,299,092
Adjusted Gross Profit 275,740 260,392 573,756 567,459
Adjusted Operating Income 196,003 183,292 407,847 412,322
Adjusted EBITDA 244,099 225,976 505,686 497,490
Depreciation and amortization 28,435 26,523 58,722 52,875
Adjusted Capital Expenditures 13,744 22,983 28,039 49,256
Operating Segments | Airline Solutions        
Segment Reporting Information [Line Items]        
Revenue 204,822 209,874 411,425 403,487
Adjusted Gross Profit 84,260 92,166 174,023 166,696
Adjusted Operating Income 22,813 35,240 53,525 54,959
Adjusted EBITDA 69,116 73,134 143,535 129,968
Depreciation and amortization 46,303 37,894 90,010 75,009
Adjusted Capital Expenditures 22,825 29,027 47,170 65,918
Operating Segments | Hospitality Solutions        
Segment Reporting Information [Line Items]        
Revenue 68,314 61,906 136,442 126,269
Adjusted Gross Profit 18,653 21,783 38,896 40,598
Adjusted Operating Income 1,964 2,193 4,101 1,871
Adjusted EBITDA 10,954 9,823 22,713 16,845
Depreciation and amortization 8,990 7,630 18,612 14,974
Adjusted Capital Expenditures 8,164 12,851 18,338 21,026
Eliminations        
Segment Reporting Information [Line Items]        
Revenue (8,445) (6,732) (15,943) (12,832)
Corporate        
Segment Reporting Information [Line Items]        
Adjusted Gross Profit (4,975) (5,763) (8,418) (5,398)
Adjusted Operating Income (48,794) (48,227) (95,891) (85,714)
Adjusted EBITDA (47,167) (47,516) (93,594) (85,325)
Depreciation and amortization 19,215 20,970 37,475 55,829
Adjusted Capital Expenditures $ 22,454 $ 14,231 $ 38,339 $ 31,210