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Goodwill and Intangible Assets - Carrying Amounts of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Gross cost, beginning balance |  |  | $ 1,279,386 |  |
Additions due to an acquisition |  |  | 19,460 |  |
Intangible assets fully amortized |  |  | 82,384 |  |
Foreign currency translation impact |  |  | 8,121 |  |
Gross cost, ending balance | $ 1,224,583 |  | 1,224,583 |  |
Accumulated amortization | (449,104) |  | (449,104) |  | $ (472,388)
Finite-lived intangible assets, net | 775,479 |  | 775,479 |  | 806,998
Amortization of intangibles | 26,154 | $ 31,208 | 56,668 | $ 63,387 |
Customer Relationships |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Gross cost, beginning balance |  |  | 1,154,210 |  |
Additions due to an acquisition |  |  | 7,980 |  |
Intangible assets fully amortized |  |  | 17,788 |  |
Foreign currency translation impact |  |  | 7,895 |  |
Gross cost, ending balance | 1,152,297 |  | 1,152,297 |  |
Accumulated amortization | (414,460) |  | (414,460) |  | (381,776)
Finite-lived intangible assets, net | 737,837 |  | $ 737,837 |  | 772,434
Customer Relationships | Minimum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 6 years |  |
Customer Relationships | Maximum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 13 years |  |
Software |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Gross cost, beginning balance |  |  | $ 110,597 |  |
Additions due to an acquisition |  |  | 11,200 |  |
Intangible assets fully amortized |  |  | 60,631 |  |
Foreign currency translation impact |  |  | 226 |  |
Gross cost, ending balance | 61,392 |  | 61,392 |  |
Accumulated amortization | (30,394) |  | (30,394) |  | (83,320)
Finite-lived intangible assets, net | 30,998 |  | $ 30,998 |  | 27,277
Software | Minimum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 3 years |  |
Software | Maximum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 7 years |  |
Content |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Gross cost, beginning balance |  |  | $ 3,965 |  |
Additions due to an acquisition |  |  | 0 |  |
Intangible assets fully amortized |  |  | 3,965 |  |
Foreign currency translation impact |  |  | 0 |  |
Gross cost, ending balance | 0 |  | 0 |  |
Accumulated amortization | 0 |  | 0 |  | (3,595)
Finite-lived intangible assets, net | 0 |  | $ 0 |  | 370
Content | Minimum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 2 years |  |
Content | Maximum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 3 years |  |
Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Gross cost, beginning balance |  |  | $ 10,614 |  |
Additions due to an acquisition |  |  | 280 |  |
Intangible assets fully amortized |  |  | 0 |  |
Foreign currency translation impact |  |  | 0 |  |
Gross cost, ending balance | 10,894 |  | 10,894 |  |
Accumulated amortization | (4,250) |  | (4,250) |  | (3,697)
Finite-lived intangible assets, net | $ 6,644 |  | $ 6,644 |  | $ 6,917
Other | Minimum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 2 years |  |
Other | Maximum |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Finite-lived intangible assets useful life |  |  | 11 years |  |

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