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Goodwill and Intangible Assets, Net - Components of Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 2,436,088 | $ 2,285,209
Accumulated Amortization | (1,606,281) | (1,295,629)
Net | 829,807 | 989,580
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 665,027 | 622,117
Accumulated Amortization | (304,130) | (185,468)
Net | 360,897 | 436,649
Supplier relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 655,467 | 618,543
Accumulated Amortization | (367,609) | (289,834)
Net | 287,858 | 328,709
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 531,735 | 480,823
Accumulated Amortization | (440,852) | (355,471)
Net | 90,883 | 125,352
Domain names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 131,944 | 117,109
Accumulated Amortization | (70,203) | (53,607)
Net | 61,741 | 63,502
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 451,915 | 446,617
Accumulated Amortization | (423,487) | (411,249)
Net | $ 28,428 | $ 35,368

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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