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Business Combinations - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Business	Dec. 31, 2018 USD ($) Business	Dec. 31, 2017 USD ($) Business
Business Acquisition [Line Items]
Number of businesses acquired | Business	6	10	10
Percentage of voting equity interests acquired	100.00%
Goodwill acquired expected to be tax deductible	$ 21,200
Amortization of intangibles	24,510	$ 25,419	$ 26,857
Income tax expense (benefit)	24,446	17,438	14,680
Administrative [Member]
Business Acquisition [Line Items]
Acquisition-related costs	2,100	2,700	3,900
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Amortization of intangibles	2,100	6,200	5,900
Income tax expense (benefit)	$ 800	$ 2,000	$ 2,500

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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

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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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