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Segment Information Reportable Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 599,030us-gaap_Revenues	$ 520,801us-gaap_Revenues	$ 371,396us-gaap_Revenues
Direct Costs By Segment	378,913jcom_DirectCostsBySegment	315,582jcom_DirectCostsBySegment	181,147jcom_DirectCostsBySegment
Operating Income (Loss)	186,206us-gaap_OperatingIncomeLoss	175,423us-gaap_OperatingIncomeLoss	162,162us-gaap_OperatingIncomeLoss
Global Operating Costs	34,170jcom_GlobalOperatingCosts	30,245jcom_GlobalOperatingCosts	28,087jcom_GlobalOperatingCosts
Business Cloud Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues	431,475	390,104	361,684
Direct Costs By Segment	241,592	191,169	174,324
Operating Income (Loss)	189,883	198,935	187,360
Digital Media Segment [Member]
Segment Reporting Information [Line Items]
Revenues	167,814	131,146	9,712
Direct Costs By Segment	137,321	124,413	6,823
Operating Income (Loss)	30,493	6,733	2,889
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(259)	(449)	0
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 220,376	$ 205,668	$ 190,249