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Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Fair Value | $ 20,659 | $ 27,149 | $ 39,922
Weighted Average Estimated Useful Life (yrs) | 8 years | 8 years | 8 years
Trademarks and Trade Names [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Fair Value | $ 5,286 | $ 6,075 | $ 20,667
Weighted Average Estimated Useful Life (yrs) | 15 years | 15 years | 15 years
Covenants Not-to-Compete [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Fair Value | $ 2,096 | $ 2,401 | $ 2,628
Weighted Average Estimated Useful Life (yrs) | 5 years | 5 years | 5 years
Backlog [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Fair Value |  | $ 460 | $ 13,600
Weighted Average Estimated Useful Life (yrs) |  | 2 years | 1 year 6 months

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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