Intralinks Holdings, Inc. and Summary of Significant Accounting Policies (Narrative) (Details) - Accounting Standards Update 2015-03 [Member] $ in Millions	Dec. 31, 2015 USD ($)
Other Current Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unamortized debt issuance costs	$ (0.5)
Other Non-current Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unamortized debt issuance costs	(1.0)
Current Portion of Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unamortized debt issuance costs	0.5
Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unamortized debt issuance costs	$ 1.0