Restructuring and Acquisition-Related Charges - Activity For Restructuring Program (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended							9 Months Ended		9 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Workforce reductions	Dec. 31, 2010 Workforce reductions	Dec. 31, 2011 Consolidation of excess facilities and other contractual obligations	Dec. 31, 2010 Consolidation of excess facilities and other contractual obligations	Sep. 30, 2012 Restructuring 2012 programs	Dec. 31, 2012 Restructuring 2012 programs	Sep. 30, 2012 Restructuring 2012 programs Workforce reductions	Dec. 31, 2012 Restructuring 2012 programs Workforce reductions	Sep. 30, 2012 Restructuring 2012 programs Consolidation of excess facilities and other contractual obligations	Dec. 31, 2012 Restructuring 2012 programs Consolidation of excess facilities and other contractual obligations	Dec. 31, 2012 Restructuring other programs	Dec. 31, 2012 Restructuring other programs Workforce reductions	Dec. 31, 2012 Restructuring other programs Consolidation of excess facilities and other contractual obligations
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 79,975	$ 81,764	$ 105,760	$ 53,946	$ 87,238	$ 27,818	$ 18,522	$ 0	$ 60,527	$ 0	$ 52,540	$ 0	$ 7,987	$ 79,975	$ 49,863	$ 30,112
Charges/Adjustments to the Provision	100,900	86,019	76,662	59,962	45,055	26,057	31,607	108,573		89,869		18,704		(7,683)	(9,755)	2,072
Utilization		(87,808)	(100,658)	(64,045)	(78,347)	(23,763)	(22,311)	(48,046)		(37,329)		(10,717)		(41,430)	(29,686)	(11,744)
Ending Balance		$ 79,975	$ 81,764	$ 49,863	$ 53,946	$ 30,112	$ 27,818		$ 60,527		$ 52,540		$ 7,987	$ 30,862	$ 10,422	$ 20,440