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Revenue - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Revenue From Contract With Customer [Abstract]    
Net revenue recognized from performance obligations $ 54,000,000 $ 56,000,000
Remaining performance obligations 2,603,000,000  
Impairment losses on contract assets $ 0 $ 0