Acquisition Reserves (Details) (USD $)	6 Months Ended	72 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2006
Acquisition Reserves [Roll Forward]
Accrued expenses and other liabilities	$ 71,381,000	$ 73,111,000
Accrued exit and disposal obligations	3,130,000	3,926,000
Manugistics [Member] | Office closure, lease termination, and sublease costs [Member]
Acquisition Reserves [Roll Forward]
Restructuring reserve			6,164,000	29,212,000
Adjustments to reserves	103,000	651,000
Cash charges	(2,235,000)	(22,837,000)
Impact of changes in exchange rates	38,000	(862,000)
Restructuring reserve	4,070,000		6,164,000	29,212,000
Manugistics [Member] | Employee Severance [Member]
Acquisition Reserves [Roll Forward]
Restructuring reserve			0	3,607,000
Adjustments to reserves	0	(840,000)
Cash charges	0	(2,842,000)
Impact of changes in exchange rates	0	75,000
Restructuring reserve	0		0	3,607,000
Manugistics [Member] | IT Projects, contract termination penalties, capital lease buy outs and other costs [Member]
Acquisition Reserves [Roll Forward]
Restructuring reserve			0	1,450,000
Adjustments to reserves	0	222,000
Cash charges	0	(1,672,000)
Impact of changes in exchange rates	0	0
Restructuring reserve	0		0	1,450,000
Manugistics [Member] | Acquisition Reserve [Member]
Acquisition Reserves [Roll Forward]
Restructuring reserve			6,164,000	34,269,000
Adjustments to reserves	103,000	33,000
Cash charges	(2,235,000)	(27,351,000)
Impact of changes in exchange rates	38,000	(787,000)
Restructuring reserve	4,070,000		6,164,000	34,269,000
Manugistics [Member] | Acquisition Direct Costs [Member]
Acquisition Reserves [Roll Forward]
Restructuring reserve			0	13,125,000
Adjustments to reserves	0	6,000
Cash charges	0	(13,131,000)
Impact of changes in exchange rates	0	0
Restructuring reserve	0		0	13,125,000
Manugistics [Member] | Acquistion Reserve and Direct Costs [Member]
Acquisition Reserves [Roll Forward]
Restructuring reserve			6,164,000	47,394,000
Adjustments to reserves	103,000	39,000
Cash charges	(2,235,000)	(40,482,000)
Impact of changes in exchange rates	38,000	(787,000)
Restructuring reserve	4,070,000		6,164,000	47,394,000
Manugistics [Member] | Accrued expenses and other liabilities [Member]
Acquisition Reserves [Roll Forward]
Accrued expenses and other liabilities	1,300,000
Manugistics [Member] | Accrued exit and disposal obiligations [Member]
Acquisition Reserves [Roll Forward]
Accrued exit and disposal obligations	2,800,000
i2 [Member] | Lease Agreements [Member]
Acquisition Reserves [Roll Forward]
Business acquisition, purchase price allocation, liabilities assumed			1,200,000
i2 [Member] | Accrued expenses and other liabilities [Member] | Lease Agreements [Member]
Acquisition Reserves [Roll Forward]
Business acquisition, purchase price allocation, current liabilities	300,000
i2 [Member] | Accrued exit and disposal obiligations [Member] | Lease Agreements [Member]
Acquisition Reserves [Roll Forward]
Business acquistion, purchase price allocation, noncurrent liabilites	$ 200,000