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Business Combinations - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Business	Sep. 30, 2018 USD ($) Business
Business Acquisition [Line Items]
Percentage of voting equity interests acquired	100.00%		100.00%
Goodwill acquired expected to be tax deductible	$ 9,600		$ 9,600
Amortization of intangibles	6,156	$ 5,228	18,065	$ 19,678
Income tax expense (benefit)	7,610	5,358	17,135	12,762
Administrative [Member]
Business Acquisition [Line Items]
Acquisition-related costs	300	700	$ 1,300	$ 1,900
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired | Business			4	8
Amortization of intangibles	29	1,100	$ 600	$ 3,800
Income tax expense (benefit)	$ 10	$ 500	$ 66	$ 1,200
Insignificant Tuck-in Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired | Business			4	1

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- Definition

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

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