Condensed Consolidating Financials Condensed Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 591,881		$ 207,801	$ 214,926	$ 218,680
Short-term investments	61,687		90,789
Accounts Receivable, Net, Current	70,830		67,245
Prepaid expenses and other current assets	33,841		20,064
Deferred income taxes	3,232		3,126
Due from Affiliate, Current	0		0
Assets, Current	761,471		389,025
Long-term investments	54,934		47,351
Property and equipment, net	40,662		31,200
Tradenames, net	82,045		83,108
Patent and patent licenses, net	28,257		28,530
Customer Relationships, Net	133,629		100,980
Goodwill	514,539		457,422
Other purchased intangibles, net	10,902		10,915
Investments in and Advances to Affiliates, Amount of Equity	0		0
Other assets	13,378		3,413
Deferred income taxes	0		1,845
Assets	1,639,817		1,153,789
Accounts payable and accrued expenses	65,586		69,570
Income taxes payable	4,727		1,569
Deferred revenue, current	57,315		36,326
Liability for Uncertain Tax Positions, Current	0		5,535
Deferred Tax Liabilities, Net, Current	1,683		1,892
Other Liabilities, Current	909		0
Due to Affiliate, Current	0		0
Liabilities, Current	130,220		114,892
Long-term Debt	589,603		245,670
Liability for uncertain tax positions	42,650		38,329
Deferred income taxes	66,095		35,833
Deferred revenue, non-current	11,742		11,189
Other long-term liabilities	5,915		1,458
Liabilities	846,225		447,371
Commitments and contingencies	0		0
Common Stock, Value, Issued	468		461
Additional paid-in capital	266,122		216,872
Retained Earnings (Accumulated Deficit)	520,351		484,850
Accumulated Other Comprehensive Income (Loss), Net of Tax	6,651	2,432	4,235
Stockholders' Equity Attributable to Parent	793,592		706,418
Stockholders' Equity Attributable to Noncontrolling Interest			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	793,592		706,418
Liabilities and Equity	1,639,817		1,153,789
Series A Preferred Stock [Member]
Preferred stock, $0.01 par value	0		0
Series B Preferred Stock [Member]
Preferred stock, $0.01 par value	0		0
j2 Global, Inc. [Member]
Cash and cash equivalents	391,483		0	0	0
Short-term investments	0		0
Accounts Receivable, Net, Current	0		0
Prepaid expenses and other current assets	220		0
Deferred income taxes	100		0
Due from Affiliate, Current	387		0
Assets, Current	392,190		0
Long-term investments	0		0
Property and equipment, net	0		0
Tradenames, net	0		0
Patent and patent licenses, net	0		0
Customer Relationships, Net	0		0
Goodwill	0		0
Other purchased intangibles, net	0		0
Investments in and Advances to Affiliates, Amount of Equity	230,131		0
Other assets	9,956		0
Deferred income taxes			0
Assets	632,277		0
Accounts payable and accrued expenses	1,839		0
Income taxes payable	0		0
Deferred revenue, current	0		0
Liability for Uncertain Tax Positions, Current			0
Deferred Tax Liabilities, Net, Current	7		0
Other Liabilities, Current	0
Due to Affiliate, Current	0		0
Liabilities, Current	1,846		0
Long-term Debt	343,680		0
Liability for uncertain tax positions	0		0
Deferred income taxes	20,832		0
Deferred revenue, non-current	0		0
Other long-term liabilities	0		0
Liabilities	366,358		0
Common Stock, Value, Issued	468		0
Additional paid-in capital	266,122		0
Retained Earnings (Accumulated Deficit)	(671)		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Stockholders' Equity Attributable to Parent	265,919		0
Stockholders' Equity Attributable to Noncontrolling Interest			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	265,919		0
Liabilities and Equity	632,277		0
j2 Cloud Services, Inc. [Member]
Cash and cash equivalents	29,968		34,406	30,994	76,712
Short-term investments	56,667		67,848
Accounts Receivable, Net, Current	11,069		11,541
Prepaid expenses and other current assets	30,043		16,662
Deferred income taxes	0		0
Due from Affiliate, Current	545		4,433
Assets, Current	128,292		134,890
Long-term investments	54,934		47,351
Property and equipment, net	8,416		11,232
Tradenames, net	10,315		12,119
Patent and patent licenses, net	8,922		15,107
Customer Relationships, Net	1,188		6,125
Goodwill	61,524		86,025
Other purchased intangibles, net	4,311		5,306
Investments in and Advances to Affiliates, Amount of Equity	407,984		357,057
Other assets	1,444		1,576
Deferred income taxes			202
Assets	687,330		676,990
Accounts payable and accrued expenses	24,778		29,419
Income taxes payable	0		0
Deferred revenue, current	23,324		23,762
Liability for Uncertain Tax Positions, Current			5,532
Deferred Tax Liabilities, Net, Current	2,502		906
Other Liabilities, Current	0
Due to Affiliate, Current	0		0
Liabilities, Current	50,604		59,619
Long-term Debt	245,923		245,670
Liability for uncertain tax positions	42,650		38,329
Deferred income taxes	9,503		0
Deferred revenue, non-current	9,552		10,753
Other long-term liabilities	940		989
Liabilities	359,172		355,360
Common Stock, Value, Issued	0		461
Additional paid-in capital	230,131		216,871
Retained Earnings (Accumulated Deficit)	91,890		97,754
Accumulated Other Comprehensive Income (Loss), Net of Tax	6,137		6,544
Stockholders' Equity Attributable to Parent	328,158		321,630
Stockholders' Equity Attributable to Noncontrolling Interest			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	328,158		321,630
Liabilities and Equity	687,330		676,990
Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	170,430		173,395	183,932	141,968
Short-term investments	5,020		22,941
Accounts Receivable, Net, Current	59,761		55,704
Prepaid expenses and other current assets	3,578		3,402
Deferred income taxes	3,132		3,126
Due from Affiliate, Current	(1)		0
Assets, Current	241,920		258,568
Long-term investments	0		0
Property and equipment, net	32,246		19,968
Tradenames, net	71,730		70,989
Patent and patent licenses, net	19,335		13,423
Customer Relationships, Net	132,441		94,855
Goodwill	453,015		371,397
Other purchased intangibles, net	6,591		5,609
Investments in and Advances to Affiliates, Amount of Equity	1,076		0
Other assets	1,978		1,837
Deferred income taxes			1,643
Assets	960,332		838,289
Accounts payable and accrued expenses	38,969		40,151
Income taxes payable	4,727		1,569
Deferred revenue, current	33,991		12,564
Liability for Uncertain Tax Positions, Current			3
Deferred Tax Liabilities, Net, Current	(826)		986
Other Liabilities, Current	909
Due to Affiliate, Current	931		4,433
Liabilities, Current	78,701		59,706
Long-term Debt	0		0
Liability for uncertain tax positions	0		0
Deferred income taxes	35,760		35,833
Deferred revenue, non-current	2,190		436
Other long-term liabilities	4,975		469
Liabilities	121,626		96,444
Common Stock, Value, Issued	34		34
Additional paid-in capital	378,986		326,984
Retained Earnings (Accumulated Deficit)	459,172		417,136
Accumulated Other Comprehensive Income (Loss), Net of Tax	514		(2,309)
Stockholders' Equity Attributable to Parent	838,706		741,845
Stockholders' Equity Attributable to Noncontrolling Interest			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	838,706		741,845
Liabilities and Equity	960,332		838,289
Consolidation, Eliminations [Member]
Cash and cash equivalents	0		0	0	0
Short-term investments	0		0
Accounts Receivable, Net, Current	0		0
Prepaid expenses and other current assets	0		0
Deferred income taxes	0		0
Due from Affiliate, Current	(931)		(4,433)
Assets, Current	(931)		(4,433)
Long-term investments	0		0
Property and equipment, net	0		0
Tradenames, net	0		0
Patent and patent licenses, net	0		0
Customer Relationships, Net	0		0
Goodwill	0		0
Other purchased intangibles, net	0		0
Investments in and Advances to Affiliates, Amount of Equity	(639,191)		(357,057)
Other assets	0		0
Deferred income taxes			0
Assets	(640,122)		(361,490)
Accounts payable and accrued expenses	0		0
Income taxes payable	0		0
Deferred revenue, current	0		0
Liability for Uncertain Tax Positions, Current			0
Deferred Tax Liabilities, Net, Current	0		0
Other Liabilities, Current	0
Due to Affiliate, Current	(931)		(4,433)
Liabilities, Current	(931)		(4,433)
Long-term Debt	0		0
Liability for uncertain tax positions	0		0
Deferred income taxes	0		0
Deferred revenue, non-current	0		0
Other long-term liabilities	0		0
Liabilities	(931)		(4,433)
Common Stock, Value, Issued	(34)		(34)
Additional paid-in capital	(609,117)		(326,983)
Retained Earnings (Accumulated Deficit)	(30,040)		(30,040)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Stockholders' Equity Attributable to Parent	(639,191)		(357,057)
Stockholders' Equity Attributable to Noncontrolling Interest			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(639,191)		(357,057)
Liabilities and Equity	$ (640,122)		$ (361,490)