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Revenue - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Aggregate amount of transaction price allocated to performance obligation $ 1,428,000,000  
Customers with payment terms 30 days  
Retentions receivable $ 122,000,000 $ 133,000,000
Retentions receivable within one year 22,000,000 $ 28,000,000
Impairment of contract assets $ 0  
Minimum [Member]    
Payment of invoices 30 days  
Maximum [Member]    
Payment of invoices 90 days