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Business Segment Information - People's Republic of China, including Hong Kong - Geographic Concentration Risk (Detail) - Peoples Republic Of China Including Hong Kong - Geographic Concentration Risk | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration percentage | 34.00% | 25.00% | 32.00% | 26.00% | 29.00%
Operating Income |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration percentage | 27.00% | 25.00% | 29.00% | 27.00% | 30.00%
Identifiable assets at year end |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration percentage |  |  | 14.00% | 12.00% | 14.00%
Equity |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration percentage |  |  | 6.00% | 9.00% | 8.00%

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