Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts	$ 3,800,000	$ 2,500,000
Retirement of property and equipment	5,300,000	33,100,000
Gross carrying amount	1,066,633,000	747,398,000
Estimated useful lives of intangible assets	6 years 3 months 15 days	6 years 2 months 12 days
Amount capitalized related to internal use software	51,500,000	43,300,000
Amount expensed related to internal use software	44,500,000	37,200,000	24,700,000
Licensing agreement with subscription bundle, term	1 year
Allowance for estimated product returns	2,600,000	1,400,000
Remeasurement and foreign currency transaction gains (losses)	3,300,000	4,700,000	3,500,000
Advertising costs	137,500,000	130,800,000	123,000,000
Foreign Postretirement Benefit Plans [Member]
Termination indemnities	9,800,000	5,100,000
Termination indemnities, compensation expense	1,500,000	1,800,000	1,100,000
Patents [Member]
Estimated useful lives of intangible assets	10 years
Product Related Intangible Assets [Member]
Gross carrying amount	620,032,000	472,582,000
Estimated useful lives of intangible assets	5 years 7 months 6 days	5 years 9 months 29 days
CloudStack [Member]
Gross carrying amount	0
Impairment of intangible assets	$ 5,200,000
Computer Equipment [Member]
Estimated useful lives of property and equipment (in years)	3 years
Office Equipment and Furniture [Member]
Estimated useful lives of property and equipment (in years)	3 years
Enterprise Resource Planning System [Member]
Estimated useful lives of property and equipment (in years)	7 years
Buildings [Member]
Estimated useful lives of property and equipment (in years)	40 years
License Update [Member]
Revenue recognition period, minimum (in months)	12 months
Revenue recognition period, maximum (in months)	24 months
Online Service Agreements [Member]
Revenue recognition, period for recognition, average	12 months
Minimum [Member]
Estimated useful lives of property and equipment (in years)	3 years
Estimated useful lives of intangible assets	3 years
Licensing agreement term	1 year
Minimum [Member] | Software [Member]
Estimated useful lives of property and equipment (in years)	3 years
Maximum [Member]
Estimated useful lives of intangible assets	7 years
Licensing agreement term	5 years
Maximum [Member] | Software [Member]
Estimated useful lives of property and equipment (in years)	7 years
Maximum [Member] | Leasehold Improvements [Member]
Estimated useful lives of property and equipment (in years)	5 years
Ingram Micro [Member] | Accounts Receivable [Member]
Percentage of gross accounts receivable related to one customer	11.00%	14.00%