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Organization, Business and Significant Accounting Policies (Details)
 12 Months Ended
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