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Business Segment Information - People's Republic of China Including Hong Kong Percentage Share of the Company's Total Revenue, Net Revenue, Total Identifiable Assets or Equity (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total revenues | People's Republic of China, including Hong Kong |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 29.00% | 31.00% | 31.00%
Net revenues | People's Republic of China, including Hong Kong |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 18.00% | 18.00% | 18.00%
Identifiable assets at year end | People's Republic of China, including Hong Kong |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 14.00% | 11.00% | 15.00%
Equity | People's Republic of China, including Hong Kong |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 8.00% | 8.00% | 13.00%
Lower end | Geographic Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 10.00% | 10.00% | 10.00%

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