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Business Combinations - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) business	Dec. 31, 2019 USD ($) business	Dec. 31, 2018 USD ($) business
Business Acquisition [Line Items]
Number of businesses acquired | business	9	6	10
Percentage of voting equity interests acquired	100.00%
Acquisition-related costs	$ 2,800	$ 2,100	$ 2,700
Goodwill acquired expected to be tax deductible	21,000
Amortization	28,535	24,510	25,419
Income tax expense (benefit)	33,938	24,446	17,438
Combined Business Acquisitions
Business Acquisition [Line Items]
Amortization	5,400	10,200	6,200
Income tax expense (benefit)	$ 700	$ 3,000	$ 2,000

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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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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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

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