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Acquisitions - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) acquisition | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) acquisition
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Non-contingent consideration from acquisitions | $ 91 |  | $ 91 |  | $ 900
Fair value adjustments reducing revenue | (202,997) | $ (186,588) | $ (581,977) | $ (533,732) |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Number of acquisitions | acquisition |  |  | 4,000 |  | 4,000
Acquisition and integration costs | 531 | 196 | $ 1,609 | 447 |
Goodwill from acquisition, expected tax deductible amount | 24,085 |  | 24,085 |  |
Series of Individually Immaterial Business Acquisitions | Accruals And Other Liabilities, Current |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Non-contingent consideration from acquisitions | 91 |  | 91 |  | $ 900
Series of Individually Immaterial Business Acquisitions | Acquired Support Contracts Adjustment To Revenue |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Fair value adjustments reducing revenue | $ 288 | $ 36 | $ 483 | $ 310 |

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