Business Combinations (Intangible Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Aug. 14, 2014	Jul. 12, 2013	Jun. 12, 2013
RelateIQ, Inc. [Member]
Business Acquisition [Line Items]
Fair Value	$ 16,200
RelateIQ, Inc. [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Fair Value	14,470
Useful Life	7 years
RelateIQ, Inc. [Member] | Customer Relationship and Other [Member]
Business Acquisition [Line Items]
Fair Value	1,730
RelateIQ, Inc. [Member] | Customer Relationship and Other [Member] | Minimum
Business Acquisition [Line Items]
Useful Life	1 year
RelateIQ, Inc. [Member] | Customer Relationship and Other [Member] | Maximum
Business Acquisition [Line Items]
Useful Life	3 years
ExactTarget [Member]
Business Acquisition [Line Items]
Fair Value		706,064
ExactTarget [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Fair Value		307,200
ExactTarget [Member] | Developed Technology [Member] | Minimum
Business Acquisition [Line Items]
Useful Life		4 years
ExactTarget [Member] | Developed Technology [Member] | Maximum
Business Acquisition [Line Items]
Useful Life		7 years
ExactTarget [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value		362,200
ExactTarget [Member] | Customer Relationships [Member] | Minimum
Business Acquisition [Line Items]
Useful Life		6 years
ExactTarget [Member] | Customer Relationships [Member] | Maximum
Business Acquisition [Line Items]
Useful Life		8 years
ExactTarget [Member] | Trade Names And Trademarks [Member]
Business Acquisition [Line Items]
Fair Value		29,400
ExactTarget [Member] | Trade Names And Trademarks [Member] | Maximum
Business Acquisition [Line Items]
Useful Life		10 years
ExactTarget [Member] | Other Purchased Intangible Assets [Member]
Business Acquisition [Line Items]
Fair Value		7,264
ExactTarget [Member] | Other Purchased Intangible Assets [Member] | Minimum
Business Acquisition [Line Items]
Useful Life		3 years
ExactTarget [Member] | Other Purchased Intangible Assets [Member] | Maximum
Business Acquisition [Line Items]
Useful Life		4 years
EdgeSpring [Member]
Business Acquisition [Line Items]
Fair Value			32,300
EdgeSpring [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Fair Value			31,030
EdgeSpring [Member] | Developed Technology [Member] | Minimum
Business Acquisition [Line Items]
Useful Life			5 years
EdgeSpring [Member] | Developed Technology [Member] | Maximum
Business Acquisition [Line Items]
Useful Life			6 years
EdgeSpring [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value			560
Useful Life			5 years
EdgeSpring [Member] | Trade Names And Trademarks [Member]
Business Acquisition [Line Items]
Fair Value			$ 710
Useful Life			5 years