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Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite Lived Intangible Assets [Line Items]
Amortization Expenses	$ 5.7	$ 3.9
Bianchi Company Inc
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	$ 9.4
Weighted average useful lives of the acquired assets	8 years 2 months 12 days
Bianchi Company Inc | Customer Relationships
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	$ 7.9
Weighted average useful lives of the acquired assets	9 years 3 months 18 days
Bianchi Company Inc | Subcontractor Relationships
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	$ 0.7
Weighted average useful lives of the acquired assets	3 years
Bianchi Company Inc | Trade Names
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	$ 0.7
Weighted average useful lives of the acquired assets	3 years
Bianchi Company Inc | Non-compete Agreements
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	$ 0.1
Weighted average useful lives of the acquired assets	3 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

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-Topic 350
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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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