Exchange Rates Used to Translate Amounts in RMB to U.S. Dollars (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Balance sheet items, except for equity accounts	6.3410		6.3410		6.3009
Items in the statements of income and cash flows	6.3344	6.4176	6.3170	6.4975