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Acquisitions - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) acquisition	Dec. 31, 2019 USD ($) acquisition	Dec. 31, 2018 USD ($) acquisition
Business Combination, Separately Recognized Transactions [Line Items]
Fair value adjustments reducing revenue	$ (219,567)	$ (202,997)	$ (184,290)	$ (194,690)	$ (202,922)	$ (186,588)	$ (169,605)	$ (177,539)	$ (801,544)	$ (736,654)	$ (691,710)
Series of Individually Immaterial Business Acquisitions
Business Combination, Separately Recognized Transactions [Line Items]
Number of acquisitions | acquisition									6,000	4,000	7,000
Acquisition and integration costs	2,227				$ 950						$ 1,361
Goodwill from acquisition, expected tax deductible amount	$ 24,133								$ 24,133
Series of Individually Immaterial Business Acquisitions | Acquired Support Contracts Adjustment To Revenue
Business Combination, Separately Recognized Transactions [Line Items]
Fair value adjustments reducing revenue									$ 599	$ 553	$ 2,469

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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