Business Combinations - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($) segment
Business Acquisition [Line Items]
Number of businesses acquired \| segment			7	5
Acquisition-related costs	$ (300)	$ 800	$ 1,600	$ 2,000
Goodwill deduction for tax purposes	15,000		15,000
Amortization	9,224	6,974	26,798	20,378
Income tax expense	12,320	9,773	27,432	24,578
Combined Business Acquisitions
Business Acquisition [Line Items]
Amortization	300	2,900	2,200	9,700
Income tax expense	$ 200	$ 1,000	$ 1,200	$ 2,900

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The number of businesses acquired by the entity during the period.

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