Business Acquisitions - Narrative (Details) - USD ($) $ in Thousands				9 Months Ended
	Oct. 30, 2015	Apr. 06, 2015	Feb. 27, 2015	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill				$ 1,135,500	$ 1,051,294
Xerocole, Codemate A/S and Octoshape [Member]
Business Acquisition [Line Items]
Acquisition-related costs				1,100
Xerocole, Inc. [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 16,600
Goodwill			12,900
Intangible assets acquired			$ 4,900
Weighted average useful life			8 years 9 months
Octoshape [Member]
Business Acquisition [Line Items]
Total purchase consideration		$ 107,047
Goodwill		$ 69,445
Intangible assets acquired				41,950
Goodwill expected to be tax deductible				$ 69,400
Bloxx [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 18,700