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)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total Revenues [Member] | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	34.00%	37.00%	34.00%
Net Revenues [Member] | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	19.00%	19.00%	17.00%
Identifiable assets at year end [Member] | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	14.00%	13.00%	13.00%
Equity [Member] | People's Republic of China, including Hong Kong
Concentration Risk [Line Items]
Concentration percentage	13.00%	10.00%	10.00%
Minimum [Member] | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	10.00%