Restructuring and Acquisition-Related Charges - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring and Related Cost [Line Items]
Restructuring and acquisition-related charges	$ 97,334,000	$ 84,375,000	$ 107,490,000
Restructuring charges	86,000,000	76,662,000	88,424,000
Acquisition-related charges	11,300,000	7,700,000	19,100,000
Date of completion of workforce reduction and/or consolidation of facilities	2015
Lease termination costs for facilities vacated	26,100,000	31,600,000	27,100,000
Restructuring Programs 2012
Restructuring and Related Cost [Line Items]
Remaining cash portion of restructure balance	62,000,000
Restructuring Programs 2013 And Beyond
Restructuring and Related Cost [Line Items]
Remaining cash portion of restructure balance	19,700,000
Restructuring - 2008 Program
Restructuring and Related Cost [Line Items]
Restructuring charges			69,300,000
Restructuring - 2010 Program
Restructuring and Related Cost [Line Items]
Restructuring charges		37,800,000
Elimination of positions		400
Date of completion of workforce reduction and/or consolidation of facilities		2011
Restructuring - 2011 Programs
Restructuring and Related Cost [Line Items]
Restructuring charges	$ 63,200,000
Elimination of positions	787
Date of completion of workforce reduction and/or consolidation of facilities	2012