Restructuring and Excess Facilities (Details Textual) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended
	Jun. 30, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2009 Facilities Charge [Member]	Dec. 31, 2008 Facilities Charge [Member]	Dec. 31, 2009 Selling, general and administrative expenses [Member]	Jun. 30, 2009 Selling, general and administrative expenses [Member]	Dec. 31, 2008 Selling, general and administrative expenses [Member]	Mar. 31, 2009 Scopus [Member] Person	Jun. 30, 2009 Scopus [Member] Employee Severance [Member]	Mar. 31, 2009 Scopus [Member] Employee Severance [Member]
Restructuring and Excess Facilities (Textual) [Abstract]
Expected sublease income		$ 131,091,000	$ 108,150,000	$ 81,138,000	$ 500,000	$ 1,200,000
Revised estimate of expected sublease income									200,000
Expenses related to activities from acquisition										7,400,000
Number of employees terminated										65
Cost of revenue										6,300,000
Research and development expense for terminated employees		102,732,000	77,197,000	61,435,000								600,000
Severance expenses for terminated employees											500,000	500,000
Excess facilities expense							3,000,000	300,000
Additional Restructuring and Excess Facilities (Textual) [Abstract]
Accrued excess facilities cost		2,600,000	2,900,000
Accrued excess facilities cost - ST		1,700,000	1,800,000
Accrued excess facilities cost - LT		900,000	1,100,000
Severance expenses for other terminated employees	$ 500,000