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Business Combinations - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Business	Dec. 31, 2017 USD ($) Business	Dec. 31, 2016 USD ($) Business
Business Acquisition [Line Items]
Number of businesses acquired | Business	10	10	9
Percentage of voting equity interests acquired	100.00%
Goodwill acquired expected to be tax deductible	$ 17,300
Amortization of intangibles	25,419	$ 26,857	$ 11,259
Income tax expense (benefit)	17,438	14,680	21,174
Interest expense	20,496	17,381	6,177
Administrative [Member]
Business Acquisition [Line Items]
Acquisition-related costs	2,700	3,900	2,300
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Amortization of intangibles	2,800	5,900	17,500
Income tax expense (benefit)	$ 1,200	$ 2,500	3,000
Interest expense			$ 1,800

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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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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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