Quarterly report pursuant to Section 13 or 15(d)

Construction Contract and Other Service Revenues - Construction Contracts and Other Service Revenues by Compensation Arrangement and Service Type (Details)

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Construction Contract and Other Service Revenues - Construction Contracts and Other Service Revenues by Compensation Arrangement and Service Type (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues $ 16,558 $ 13,681
Construction    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 15,756 12,883
Design    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 302 542
Other    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 500 256
Cost-plus fee    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 12,486 3,309
Guaranteed maximum price    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 2,101 5,044
Firm fixed price    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 1,471 5,072
Other    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues $ 500 $ 256