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Acquisition - Additional information (Details) - CSI Electrical Contractors, Inc [Member] $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Business Acquisition [Line Items]
Preliminary estimated net asset adjustments	$ 1.0
Total consideration, net of net asset adjustments	80.7
Margin Guarantee [Member]
Business Acquisition [Line Items]
Change in contingent consideration	1.0
Certain Performance Targets and Continued Employment of Key Executives [Member]
Business Acquisition [Line Items]
Change in contingent consideration	$ 0.4

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Amount of preliminary estimated net asset adjustments consisting of acquisition-date fair value.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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