Unrestricted Subsidiaries Unrestricted Subsidiaries (Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash and cash equivalents	$ 207,801	$ 218,680	$ 139,359	$ 64,752
Accounts Receivable, Net	67,245	37,285
Prepaid expenses and other current assets	20,064	15,388
Deferred income taxes	3,126	1,092
Assets, Current	389,025	377,499
Property and equipment, net	31,200	19,599
Tradenames, net	83,108	71,409
Customer Relationships, Net	100,980	64,723
Goodwill	457,422	407,825	279,016
Other purchased intangibles, net	10,915	9,855
Deferred income taxes	1,845	1,852
Other assets	3,413	3,238
Assets	1,153,789	995,170
Accounts payable and accrued expenses	69,570	39,874
Income taxes payable	1,569	3,037
Deferred revenue	36,326	30,493
Deferred Tax Liabilities, Net, Current	1,892	0
Liabilities, Current	114,892	78,927
Deferred income taxes	35,833	32,393
Mandatorily redeemable financial instrument	0	8,740
Liabilities	447,371	400,575
Commitments and contingencies	0	0
Common Stock, Value, Issued	461	451
Additional paid-in capital	216,872	169,542
Retained earnings	484,850	424,790
Accumulated Other Comprehensive Income (Loss), Net of Tax	4,235	(88)
Stockholders' equity attributable to j2 Global, Inc.	706,418	594,695	554,375	431,745
Stockholders' Equity Attributable to Noncontrolling Interest	0	(100)	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	706,418	594,595	554,375	431,745
Liabilities and Equity	1,153,789	995,170
Ziff Davis, Inc [Member]
Cash and cash equivalents	16,506
Accounts Receivable, Net	47,804
Prepaid expenses and other current assets	3,090
Deferred income taxes	2,704
Assets, Current	70,104
Property and equipment, net	13,358
Tradenames, net	49,701
Customer Relationships, Net	53,169
Goodwill	140,740
Other purchased intangibles, net	3,208
Deferred income taxes	1,463
Other assets	1,543
Assets	333,286
Accounts payable and accrued expenses	23,087
Income taxes payable	3,294
Deferred revenue	2,743
Deferred Tax Liabilities, Net, Current	679
Liabilities, Current	29,803
Deferred income taxes	21,696
Liabilities	51,499
Additional paid-in capital	297,390
Retained earnings	(15,366)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(237)
Stockholders' equity attributable to j2 Global, Inc.	281,787
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	281,787
Liabilities and Equity	$ 333,286