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Organization, Business and Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) segment $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Number of business segments (segment) | segment | 2 |  |
Contract retention provision | 10.00% |  |
Foreign currency gain (loss) | $ (100,000) |  |
Revenue recognized, related to change orders and claims included as contract price adjustments | 2,400,000 | $ 14,700,000 |
Increase (decrease) in operating income | 118,560,000 | 86,545,000 | $ 57,178,000
Increase (decrease) in net income | $ 85,010,000 | $ 58,759,000 | $ 37,690,000
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ 4.95 | $ 3.48 | $ 2.26
Advertising cost | $ 800,000 | $ 700,000 | $ 800,000
Option to extend lease term (up to) | 5 years |  |
Option to terminate leases, period | 1 year |  |
Revenue from Contract with Customer | Top Ten Customers | Customer Concentration Risk |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Concentration risk | 34.90% | 32.70% | 30.80%
Labor employees covered by collective bargaining agreements | Labor Force Concentration Risk |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Concentration risk | 92.00% |  |
Contingencies Excluding Wildfire and Health Insurance |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Insurance coverage deductible | $ 1,000,000 |  |
Wildfire |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Insurance coverage deductible | 2,000,000 |  |
Contingency Umbrella Exposure Limit |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Insurance coverage deductible | 3,800,000 |  |
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 | 6 years |  |
Contracts Accounted for under Percentage of Completion |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Increase (decrease) in consolidated gross margin | 0.40% | (0.80%) | (0.80%)
Increase (decrease) in operating income | $ 9,200,000 | $ (18,000,000) | $ (11,700,000)
Increase (decrease) in net income | $ 6,600,000 | $ (12,800,000) | $ (7,500,000)
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares | $ 0.39 | $ (0.76) | $ (0.45)
Joint Venture |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Proportionate share of joint venture revenues | $ 26,100,000 | $ 27,200,000 | $ 20,300,000

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