Schedule of Intangible Assets (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012
Other Intangible Assets
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized period	27 years
Minimum | License Agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized period	20 years
Minimum | Customer Relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized period	8 years
Maximum | License Agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized period	40 years
Maximum | Customer Relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized period	20 years