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Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 3,440 | $ 28,401
Weighted Average Estimated Useful Life (yrs) | 8 years | 8 years
Trademarks and Trade Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 1,695 | $ 15,496
Weighted Average Estimated Useful Life (yrs) | 15 years | 15 years
Covenants Not-to-Compete [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 250 | $ 1,607
Weighted Average Estimated Useful Life (yrs) | 5 years | 5 years
Backlog [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value |  | $ 13,600
Weighted Average Estimated Useful Life (yrs) |  | 1 year 6 months

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 No definition available. + Details
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