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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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