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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Details) - 2020 Acquisitions $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items]
Estimated fair value at acquisition date	$ 96,826
Weighted average amortization period at acquisition date	6 years 6 months
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated fair value at acquisition date	$ 81,154
Weighted average amortization period at acquisition date	6 years 1 month 6 days
Backlog
Finite-Lived Intangible Assets [Line Items]
Estimated fair value at acquisition date	$ 4,022
Weighted average amortization period at acquisition date	1 year 4 months 24 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Estimated fair value at acquisition date	$ 7,654
Weighted average amortization period at acquisition date	14 years 4 months 24 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated fair value at acquisition date	$ 3,996
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://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

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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

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

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