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Business Segment Information - Additional Information (Detail) - People's Republic of China, including Hong Kong - Geographic Concentration Risk
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues        
Concentration Risk [Line Items]        
Concentration percentage 37.00% 26.00% 31.00% 26.00%
Operating Income        
Concentration Risk [Line Items]        
Concentration percentage 38.00% 28.00% 33.00% 28.00%