Exchange Rates Used to Translate Amounts in RMB to U.S. Dollars (Detail)	0 Months Ended	12 Months Ended
	Jun. 14, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance sheet items, except for equity accounts		6.2855	6.3009	6.6227
Items in the statements of income and cash flows	6.4822	6.3125	6.4588	6.7695