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Divestitures and Held for Sale - Additional Information (Detail) - Asset Held For Sale [Member]
3 Months Ended 9 Months Ended
Dec. 31, 2019
subsidiary
Sep. 30, 2020
USD ($)
Number of subsidiaries intent to divestiture | subsidiary 2  
Gain (loss) on divestiture   $ 0
Prepaid Expense And Other Current Assets [Member]    
Consideration on disposal of assets   10,000,000
Other Assets [Member]    
Consideration on disposal of assets   $ 5,000,000