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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail) - Acquisitions $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items] |
Estimated fair value at acquisition date | $ 103,791
Weighted average amortization period at acquisition dates (in years) | 8 years 1 month
Customer relationships |
Finite-Lived Intangible Assets [Line Items] |
Estimated fair value at acquisition date | $ 76,213
Weighted average amortization period at acquisition dates (in years) | 6 years 9 months 18 days
Backlog |
Finite-Lived Intangible Assets [Line Items] |
Estimated fair value at acquisition date | $ 333
Weighted average amortization period at acquisition dates (in years) | 2 years
Trade names |
Finite-Lived Intangible Assets [Line Items] |
Estimated fair value at acquisition date | $ 18,815
Weighted average amortization period at acquisition dates (in years) | 15 years
Non-compete agreements |
Finite-Lived Intangible Assets [Line Items] |
Estimated fair value at acquisition date | $ 8,430
Weighted average amortization period at acquisition dates (in years) | 5 years

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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 The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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