Acquisition Reserves (Details) (USD $)			9 Months Ended	72 Months Ended		9 Months Ended	72 Months Ended		9 Months Ended	72 Months Ended		9 Months Ended	72 Months Ended		9 Months Ended	72 Months Ended		9 Months Ended	72 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Manugistics [Member] Office closure, lease termination, and sublease costs [Member]	Dec. 31, 2011 Manugistics [Member] Office closure, lease termination, and sublease costs [Member]	Dec. 31, 2006 Manugistics [Member] Office closure, lease termination, and sublease costs [Member]	Sep. 30, 2012 Manugistics [Member] Employee Severance [Member]	Dec. 31, 2011 Manugistics [Member] Employee Severance [Member]	Dec. 31, 2006 Manugistics [Member] Employee Severance [Member]	Sep. 30, 2012 Manugistics [Member] IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]	Dec. 31, 2011 Manugistics [Member] IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]	Dec. 31, 2006 Manugistics [Member] IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]	Sep. 30, 2012 Manugistics [Member] Acquisition Reserve [Member]	Dec. 31, 2011 Manugistics [Member] Acquisition Reserve [Member]	Dec. 31, 2006 Manugistics [Member] Acquisition Reserve [Member]	Sep. 30, 2012 Manugistics [Member] Acquisition Direct Costs [Member]	Dec. 31, 2011 Manugistics [Member] Acquisition Direct Costs [Member]	Dec. 31, 2006 Manugistics [Member] Acquisition Direct Costs [Member]	Sep. 30, 2012 Manugistics [Member] Acquistion Reserve and Direct Costs [Member]	Dec. 31, 2011 Manugistics [Member] Acquistion Reserve and Direct Costs [Member]	Dec. 31, 2006 Manugistics [Member] Acquistion Reserve and Direct Costs [Member]	Sep. 30, 2012 Manugistics [Member] Accrued expenses and other liabilities [Member]	Sep. 30, 2012 Manugistics [Member] Accrued exit and disposal obiligations [Member]	Dec. 31, 2010 i2 [Member] Lease Agreements [Member]	Sep. 30, 2012 i2 [Member] Accrued expenses and other liabilities [Member] Lease Agreements [Member]	Sep. 30, 2012 i2 [Member] Accrued exit and disposal obiligations [Member] Lease Agreements [Member]
Restructuring Cost and Reserve [Line Items]
Accrued expenses and other liabilities	$ 80,760,000	$ 73,111,000																			$ 800,000
Accrued exit and disposal obligations	2,773,000	3,926,000																				2,700,000
Acquisition Reserves [Roll Forward]
Restructuring reserve			6,164,000		29,212,000	0		3,607,000	0		1,450,000	6,164,000		34,269,000	0		13,125,000	6,164,000		47,394,000
Adjustments to reserves			(438,000)	651,000		0	(840,000)		0	222,000		(438,000)	33,000		0	6,000		(438,000)	39,000
Cash charges			(2,412,000)	(22,837,000)		0	(2,842,000)		0	(1,672,000)		(2,412,000)	(27,351,000)		0	(13,131,000)		(2,412,000)	(40,482,000)
Impact of changes in exchange rates			138,000	(862,000)		0	75,000		0	0		138,000	(787,000)		0	0		138,000	(787,000)
Restructuring reserve			3,452,000	6,164,000	29,212,000	0	0	3,607,000	0	0	1,450,000	3,452,000	6,164,000	34,269,000	0	0	13,125,000	3,452,000	6,164,000	47,394,000
Business acquisition, purchase price allocation, liabilities assumed																							1,200,000
Business acquisition, purchase price allocation, current liabilities																								300,000
Business acquistion, purchase price allocation, noncurrent liabilites																									$ 100,000