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Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Fair Value | $ 39,922 | $ 18,511 | $ 36,129
Weighted Average Estimated Useful Life (yrs) | 8 years | 9 years | 8 years
Trademarks and Trade Names [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Fair Value | $ 20,667 | $ 8,983 | $ 14,567
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 | $ 2,628 | $ 2,773 | $ 4,668
Weighted Average Estimated Useful Life (yrs) | 5 years | 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 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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