Business Segment Information - People's Republic of China Including Hong Kong Percentage Share of the Company's Total Revenue, Net Revenue, total Operating Income, Total Identifiable Assets or Equity (Detail) - People's Republic of China, including Hong Kong - Geographic Concentration Risk

3 Months Ended

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Revenues

Concentration Risk [Line Items]

Concentration percentage

25.00%

31.00%