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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail) - Acquisitions 2017 $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 103,791
Weighted average amortization period at acquisition date	8 years 1 month
Customer relationships
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 76,213
Weighted average amortization period at acquisition date	6 years 9 months 18 days
Backlog
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 333
Weighted average amortization period at acquisition date	2 years
Trade names
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 18,815
Weighted average amortization period at acquisition date	15 years
Non-compete agreements
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 8,430
Weighted average amortization period at acquisition date	5 years

X

- 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

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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.

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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

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