Amortization of Intangible Assets Estimated Useful Lives (Detail)	9 Months Ended
	Sep. 30, 2013
Land use rights
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	50 years
Leasehold right
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	20 years
Licenses and permits
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	Contract Terms
Software
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	5 years