Subsequent Events	12 Months Ended
Dec. 31, 2019
Subsequent Events
Subsequent Events	16. Subsequent Events Effective as of February 1, 2020, we acquired all of the issued and outstanding common stock of Starr Electric Company, Incorporated and each of its wholly-owned subsidiaries (collectively, “Starr”). Starr is headquartered in Greensboro, North Carolina, and is a leader in commercial and industrial electrical work. We expect Starr to initially contribute annualized revenues of approximately $90 million to $100 million.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration