Quarterly report pursuant to Section 13 or 15(d)

Remaining Performance Obligations - Remaining Performance Obligations (Details)

v3.20.2
Remaining Performance Obligations - Remaining Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Jun. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 24 months
Construction  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 56.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period 6 months
Service  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 100.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period 6 months