Exchange Rates Used to Translate Amounts in RMB to U.S. Dollars (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Balance sheet items, except for equity accounts	6.1787		6.1787		6.2855
Items in the statements of comprehensive income and cash flows	6.2053	6.3074	6.2416	6.3074