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v3.21.1

Organization, Business and Basis of Presentation (Details) | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) segment $ / shares | Mar. 31, 2020 USD ($) $ / shares
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Number of business segments (segment) | segment | 2 |
Foreign currency gains (losses) | $ 0 | $ 0
Capital contributions to joint venture | 0 |
Revenue recognized, related to change orders and claims included as contract price adjustments | 14,000,000.0 | 36,400,000
Increase (decrease) in operating income | 27,411,000 | 16,408,000
Increase (decrease) in net income | $ 19,928,000 | $ 9,932,000
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ 1.17 | $ 0.59
Contracts Accounted for under Percentage of Completion |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Increase (decrease) in consolidated gross margin | 0.10% | 0.10%
Increase (decrease) in operating income | $ 600,000 | $ 0
Increase (decrease) in net income | $ 400,000 | $ 0
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ 0.02 | $ 0
Huen Electric Inc |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |
Distributions to partners | $ 0 |

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