Business Combinations - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired			5	4
Percentage of voting equity interests acquired	100.00%	100.00%	100.00%	100.00%
Goodwill acquired expected to be tax deductible	$ 7,500		$ 7,500
Amortization of intangibles	7,322	$ 6,550	14,450	$ 12,966
Income tax expense (benefit)	5,161	5,998	7,404	9,781
Administrative [Member]
Business Acquisition [Line Items]
Acquisition-related costs	700	700	1,200	1,300
Alpha [Member]
Business Acquisition [Line Items]
Increase in goodwill			2,100
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Amortization of intangibles	16	700	200	1,500
Income tax expense (benefit)	$ 17	$ 400	$ 87	$ 1,100

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 increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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