Business Combinations - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) business	Mar. 31, 2020 USD ($) business
Business Acquisition [Line Items]
Number of businesses acquired \| business	1	2
Acquisition-related costs	$ 1,200	$ 700
Amortization	8,396	6,680
Income tax expense	6,150	5,684
Combined Business Acquisitions
Business Acquisition [Line Items]
Amortization	400	2,500
Income tax expense	$ 400	$ 600

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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