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v3.24.0.1

Organization, Business and Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) segment $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Number of business segments (segment) | segment | 2 |  |
Contract retention provision | 10.00% |  |
Contract revenues | $ 3,643,905,000 | $ 3,008,542,000 | $ 2,498,289,000
Foreign currency gain (loss) | 0 | 0 | (100,000)
Revenue recognized, related to change orders and claims included as contract price adjustments | 76,500,000 | 19,600,000 |
Increase (decrease) in operating income | 129,093,000 | 114,907,000 | 118,560,000
Increase (decrease) in net income | $ 90,990,000 | $ 83,381,000 | $ 85,010,000
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ 5.40 | $ 4.91 | $ 4.95
Advertising cost | $ 1,800,000 | $ 1,200,000 | $ 800,000
Option to extend lease term (up to) | 6 years |  |
Option to terminate leases, period | 1 year |  |
Government assistance, amount |  | $ 2,300,000 |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Nonoperating Income (Expense) |
Revenue from Contract with Customer | Top Ten Customers | Customer Concentration Risk |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Concentration risk | 37.90% | 35.40% | 34.90%
Labor employees covered by collective bargaining agreements | Labor Force Concentration Risk |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Concentration risk | 84.00% |  |
Contingencies Excluding Wildfire and Health Insurance |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Insurance coverage deductible | $ 1,000,000 |  |
Health Insurance |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Insurance coverage deductible | $ 200,000 |  |
Minimum |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Remaining lease term | 1 year |  |
Maximum |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Remaining lease term | 10 years |  |
Contracts Accounted for under Percentage of Completion |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Increase (decrease) in consolidated gross margin | (1.70%) | (0.40%) | 0.40%
Increase (decrease) in operating income | $ (62,200,000) | $ (9,800,000) | $ 9,200,000
Increase (decrease) in net income | $ (43,600,000) | $ (6,900,000) | $ 6,600,000
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ (2.59) | $ (0.41) | $ 0.39
Joint Venture |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Contract revenues | $ 33,000,000 | $ 11,300,000 | $ 26,100,000

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