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Summary of Significant Accounting Policies - Foreign Operations (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
item
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Foreign operations                        
Assets $ 1,255,740       $ 1,170,567       $ 1,255,740 $ 1,170,567    
Revenue 579,017 $ 608,311 $ 631,165 $ 561,502 601,863 $ 507,828 $ 456,811 $ 430,446 2,379,995 1,996,948 $ 1,929,415  
Functional currencies and foreign currency translation                        
Foreign exchange gain (loss)                 253 202 (763)  
Cash concentration                        
Cash and cash equivalents 170,385       135,823       170,385 135,823 161,122 $ 139,465
Treasury bill funds 155,400       100,500       155,400 100,500    
Cash balances with various high credit quality financial institutions 15,000       35,300       $ 15,000 35,300    
Collective bargaining agreements                        
Percentage of labor force subject to collective bargaining agreements                 52.00%      
Number of collective bargaining agreements | item                 97      
Number of collective bargaining agreements requiring renegotiation during the year | item                 75      
Number of years without work stoppages                 20 years      
Revenue recognition                        
Future gross profit on contracts due to change from accrued loss provision                 $ 0      
Reserve for estimated losses on uncompleted contracts 10,067       12,801       10,067 12,801    
Unapproved change orders and claims 67,800               67,800      
Revenue recognized                 56,700      
Accounts receivable                        
Allowance for doubtful accounts 480       1,030       480 1,030    
Estimated net impact of change in estimate                        
Revised estimates in current year that impact prior period 6,435       1,685       6,435 1,685 (1,685)  
Revised estimates in current year that impact prior period         (6,435)         (6,435) (1,540)  
Net impact to gross margin $ 6,435       $ (4,750)       $ 6,435 $ (4,750) $ (3,225)  
EPS impact to year | $ / shares $ 0.09       $ (0.05)       $ 0.09 $ (0.05) $ (0.04)  
Gross profit $ 68,477 $ 70,421 $ 84,483 $ 55,053 $ 68,616 50,129 43,285 $ 39,277 $ 278,434 $ 201,307 $ 219,873  
Texas Heavy Civil Business unit | JCG | East                        
Estimated net impact of change in estimate                        
Charge against income           37,300            
Disputed Receivables.                        
Foreign operations                        
Revenue           27,500            
Estimated net impact of change in estimate                        
Receivable related to a dispute with a customer           17,900            
Receipts related to disputed receivable           38,000            
Gross profit           $ 26,700 $ 0          
Accrued Expenses and Other Current Liabilities                        
Worker's compensation insurance                        
Self insurance reserve 18,500       18,800       18,500 18,800    
Canada                        
Foreign operations                        
Assets 12,700       11,800       12,700 11,800    
Revenue                 8,300 11,200 17,800  
Income (loss) before tax of Canadian operations                 (300) 800 $ 300  
VIEs                        
Cash concentration                        
Cash and cash equivalents $ 60,256       $ 7,045       $ 60,256 $ 7,045