Acquisition Reserves (Details) (USD $)		12 Months Ended	60 Months Ended		12 Months Ended	60 Months Ended		12 Months Ended	60 Months Ended		12 Months Ended			60 Months Ended		12 Months Ended	60 Months Ended		12 Months Ended	60 Months Ended		21 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Office closure, lease termination, and sublease costs [Member]	Dec. 31, 2010 Office closure, lease termination, and sublease costs [Member]	Dec. 31, 2006 Office closure, lease termination, and sublease costs [Member]	Dec. 31, 2011 Employee severance and termination benefits [Member]	Dec. 31, 2010 Employee severance and termination benefits [Member]	Dec. 31, 2006 Employee severance and termination benefits [Member]	Dec. 31, 2011 IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]	Dec. 31, 2010 IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]	Dec. 31, 2006 IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]	Dec. 31, 2011 Acquisition reserve [Member]	Dec. 31, 2010 Acquisition reserve [Member]	Dec. 31, 2009 Acquisition reserve [Member]	Dec. 31, 2010 Acquisition reserve [Member]	Dec. 31, 2006 Acquisition reserve [Member]	Dec. 31, 2011 Acquisition direct costs [Member]	Dec. 31, 2010 Acquisition direct costs [Member]	Dec. 31, 2006 Acquisition direct costs [Member]	Dec. 31, 2011 Acquistion reserve and direct costs [Member]	Dec. 31, 2010 Acquistion reserve and direct costs [Member]	Dec. 31, 2006 Acquistion reserve and direct costs [Member]	Sep. 30, 2007 Manugistics [Member] Acquisition reserve [Member]	Dec. 31, 2006 Manugistics [Member] Acquisition reserve [Member]	Dec. 31, 2011 i2 [Member] Lease agreements [Member]	Dec. 31, 2010 i2 [Member] Lease agreements [Member]
Acquisition Reserves [Roll Forward]
Initial reserve	$ 1,781,000	$ 9,574,000		$ 29,212,000	$ 0		$ 3,607,000	$ 0		$ 1,450,000	$ 9,574,000				$ 34,269,000	$ 0		$ 13,125,000	$ 9,574,000		$ 47,394,000		$ 47,400,000
Adjustments to reserves		84,000	567,000		0	(840,000)		0	222,000		84,000			(51,000)		0	6,000		84,000	(45,000)		2,900,000
Cash charges		(3,476,000)	(19,361,000)		0	(2,842,000)		0	(1,672,000)		(3,476,000)			(23,875,000)		0	(13,131,000)		(3,476,000)	(37,006,000)
Impact of changes in exchange rates		(18,000)	(844,000)		0	75,000		0	0		(18,000)			(769,000)		0	0		(18,000)	(769,000)
Reserve balance	1,781,000	6,164,000	9,574,000	29,212,000	0	0	3,607,000	0	0	1,450,000	6,164,000	9,574,000		9,574,000	34,269,000	0	0	13,125,000	6,164,000	9,574,000	47,394,000		47,400,000
Increase (decrease) in restructuring reserve												1,500,000	1,400,000
Accrued expenses and other liabilities	73,111,000										3,700,000													300,000
Accrued exit and disposal obligations	3,926,000										2,400,000													400,000
Business acquisition, purchase price allocation, unfavorable contract accrual																									$ 1,200,000