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Acquisitions - Additional information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 15, 2019 | Jul. 02, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  | $ 14,215,000 | $ 10,844,000 | $ 32,206,000 | $ 28,378,000 |
Amortization of intangible assets |  |  | 1,419,000 | $ 743,000 | 2,888,000 | $ 979,000 |
CSI Electrical Contractors, Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration paid | $ 79,720,000 |  |  |  |  |  |
Preliminary estimated net asset adjustments | 633,000 |  |  |  |  |  |
Acquisition related costs |  |  | 300,000 |  | 300,000 |  |
Revenues |  |  | 65,000,000 |  | 65,000,000 |  |
Income before income taxes |  |  | 1,700,000 |  | 1,700,000 |  |
Amortization of intangible assets |  |  | 1,100,000 |  | 1,100,000 |  |
Total consideration, net of net asset adjustments | $ 80,353,000 |  |  |  |  |  |
CSI Electrical Contractors, Inc [Member] | Revolving Credit Facility [Member] | Pro Forma [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Borrowings under line of credit |  |  |  |  |  |  | $ 79,700,000
CSI Electrical Contractors, Inc [Member] | Margin Guarantee [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | 1,100,000 |  | 1,100,000 |  |
CSI Electrical Contractors, Inc [Member] | Certain Performance Targets and Continued Employment of Key Executives [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | 0 |  | 0 |  |
Huen Electric Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration paid |  | $ 47,082,000 |  |  | 47,082,000 |  |
Preliminary estimated net asset adjustments |  | 10,749,000 |  |  | 10,834,000 |  |
Total consideration, net of net asset adjustments |  | $ 57,831,000 |  |  | 57,916,000 |  |
Huen Electric Inc [Member] | Margin Guarantee [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | 0 |  | 1,400,000 |  |
Huen Electric Inc [Member] | Certain Performance Targets and Continued Employment of Key Executives [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | $ 900,000 |  | $ 1,400,000 |  |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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