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Business Combinations - Additional Information (Detail) $ in Thousands | 12 Months Ended
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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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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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