Condensed Consolidating Financials Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 313,754		$ 255,530	$ 415,930	$ 433,663
Short-term investments	50,915		79,655
Accounts receivable, net of allowances of $5,542 and $4,261, respectively	106,365		114,680
Prepaid expenses and other current assets	22,472		25,722
Deferred income taxes	0		7,218
Due from Affiliate, Current	0		0
Total current assets	493,506		482,805
Long-term investments	42,537		78,563
Property and equipment, net	60,053		57,442
Trade names, net	120,678		118,965
Patent and patent licenses, net	15,918		18,841
Customer Relationships, Net	190,380		197,319
Goodwill	840,946		807,661
Other purchased intangibles, net	17,270		17,516
Investments in and Advances to Affiliates, Amount of Equity	0		0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	6,494		0
Other assets	5,369		4,607
Total assets	1,793,151		1,783,719
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	106,512		114,384
Income taxes payable	4,147		5,589
Deferred revenue, current	74,558		76,104
Capital Lease Obligations, Current	29		214
Deferred Tax Liabilities, Net, Current	0		363
Due to Affiliate, Current	0		0
Total current liabilities	185,246		196,654
Long-term Debt	596,813		592,037
Capital Lease Obligations, Noncurrent	79		148
Liability for uncertain tax positions	40,356		35,917
Deferred income taxes	42,352		43,989
Deferred revenue, non-current	4,788		6,538
Other long-term liabilities	5,124		18,228
Total liabilities	874,758		893,511
Commitments and contingencies	0		0
Common Stock, Value, Issued	481		479
Additional paid-in capital	299,349		292,064
Retained Earnings (Accumulated Deficit)	657,035		626,789
Accumulated Other Comprehensive Income (Loss), Net of Tax	(38,472)	$ (28,070)	(29,124)
Stockholders' Equity Attributable to Parent	918,393		890,208
Total liabilities and stockholders' equity	1,793,151		1,783,719
Series A Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	0		0
j2 Global, Inc. [Member]
ASSETS
Cash and cash equivalents	74,197		55,516	220,787	226,790
Short-term investments	50,853		79,595
Accounts receivable, net of allowances of $5,542 and $4,261, respectively	0		0
Prepaid expenses and other current assets	10,097		6,887
Deferred income taxes			0
Due from Affiliate, Current	144,488		117,000
Total current assets	279,635		258,998
Long-term investments	42,537		78,563
Property and equipment, net	0		0
Trade names, 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	1,118,892		1,051,927
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0		0
Other assets	0		8,219
Total assets	1,441,064		1,397,707
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	3,927		4,573
Income taxes payable	0		0
Deferred revenue, current	0		0
Capital Lease Obligations, Current	0		0
Deferred Tax Liabilities, Net, Current			511
Due to Affiliate, Current	135,078		121,263
Total current liabilities	139,005		126,347
Long-term Debt	350,609		354,437
Capital Lease Obligations, Noncurrent	0		0
Liability for uncertain tax positions	0		0
Deferred income taxes	31,569		24,936
Deferred revenue, non-current	0		0
Other long-term liabilities	1,486		1,779
Total liabilities	522,669		507,499
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	481		479
Additional paid-in capital	299,349		292,064
Retained Earnings (Accumulated Deficit)	616,226		595,216
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,339		2,449
Stockholders' Equity Attributable to Parent	918,395		890,208
Total liabilities and stockholders' equity	1,441,064		1,397,707
j2 Cloud Services, Inc. [Member]
ASSETS
Cash and cash equivalents	39,655		9,975	11,400	36,810
Short-term investments	0		0
Accounts receivable, net of allowances of $5,542 and $4,261, respectively	12,430		10,679
Prepaid expenses and other current assets	2,151		8,500
Deferred income taxes			3,316
Due from Affiliate, Current	172,564		174,127
Total current assets	226,800		206,597
Long-term investments	0		0
Property and equipment, net	7,064		6,557
Trade names, net	10,064		10,118
Patent and patent licenses, net	672		743
Customer Relationships, Net	867		1,193
Goodwill	56,296		56,296
Other purchased intangibles, net	4,223		4,218
Investments in and Advances to Affiliates, Amount of Equity	1,136,930		1,095,155
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	24,899		14,978
Other assets	345		1,167
Total assets	1,468,160		1,397,022
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	30,087		27,976
Income taxes payable	9,262		9,573
Deferred revenue, current	19,582		19,530
Capital Lease Obligations, Current	0		0
Deferred Tax Liabilities, Net, Current			0
Due to Affiliate, Current	0		0
Total current liabilities	58,931		57,079
Long-term Debt	246,204		246,749
Capital Lease Obligations, Noncurrent	0		0
Liability for uncertain tax positions	40,356		35,917
Deferred income taxes	0		0
Deferred revenue, non-current	3,120		4,667
Other long-term liabilities	657		683
Total liabilities	349,268		345,095
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	0		0
Additional paid-in capital	242,319		238,631
Retained Earnings (Accumulated Deficit)	876,575		813,058
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2)		238
Stockholders' Equity Attributable to Parent	1,118,892		1,051,927
Total liabilities and stockholders' equity	1,468,160		1,397,022
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	199,902		190,039	183,743	170,063
Short-term investments	62		60
Accounts receivable, net of allowances of $5,542 and $4,261, respectively	93,941		104,131
Prepaid expenses and other current assets	15,340		14,319
Deferred income taxes			4,413
Due from Affiliate, Current	0		0
Total current assets	309,245		312,962
Long-term investments	0		0
Property and equipment, net	52,989		50,885
Trade names, net	110,614		108,847
Patent and patent licenses, net	15,246		18,098
Customer Relationships, Net	189,513		196,126
Goodwill	784,650		751,365
Other purchased intangibles, net	13,047		13,298
Investments in and Advances to Affiliates, Amount of Equity	2		0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2,125		(14,978)
Other assets	5,024		4,370
Total assets	1,482,455		1,440,973
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	72,504		81,965
Income taxes payable	0		0
Deferred revenue, current	54,976		56,574
Capital Lease Obligations, Current	29		214
Deferred Tax Liabilities, Net, Current			363
Due to Affiliate, Current	181,974		169,864
Total current liabilities	309,483		308,980
Long-term Debt	0		0
Capital Lease Obligations, Noncurrent	79		148
Liability for uncertain tax positions	0		0
Deferred income taxes	31,314		19,053
Deferred revenue, non-current	1,668		1,871
Other long-term liabilities	2,981		15,766
Total liabilities	345,525		345,818
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	0		0
Additional paid-in capital	526,323		524,031
Retained Earnings (Accumulated Deficit)	651,416		602,935
Accumulated Other Comprehensive Income (Loss), Net of Tax	(40,809)		(31,811)
Stockholders' Equity Attributable to Parent	1,136,930		1,095,155
Total liabilities and stockholders' equity	1,482,455		1,440,973
Consolidation, Eliminations [Member]
ASSETS
Cash and cash equivalents	0		0	$ 0	$ 0
Short-term investments	0		0
Accounts receivable, net of allowances of $5,542 and $4,261, respectively	(6)		(130)
Prepaid expenses and other current assets	(5,116)		(3,984)
Deferred income taxes			(511)
Due from Affiliate, Current	(317,052)		(291,127)
Total current assets	(322,174)		(295,752)
Long-term investments	0		0
Property and equipment, net	0		0
Trade names, 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	(2,255,824)		(2,147,082)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	(20,530)		0
Other assets	0		(9,149)
Total assets	(2,598,528)		(2,451,983)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(6)		(130)
Income taxes payable	(5,115)		(3,984)
Deferred revenue, current	0		0
Capital Lease Obligations, Current	0		0
Deferred Tax Liabilities, Net, Current			(511)
Due to Affiliate, Current	(317,052)		(291,127)
Total current liabilities	(322,173)		(295,752)
Long-term Debt	0		(9,149)
Capital Lease Obligations, Noncurrent	0		0
Liability for uncertain tax positions	0		0
Deferred income taxes	(20,531)		0
Deferred revenue, non-current	0		0
Other long-term liabilities	0		0
Total liabilities	(342,704)		(304,901)
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	0		0
Additional paid-in capital	(768,642)		(762,662)
Retained Earnings (Accumulated Deficit)	(1,487,182)		(1,384,420)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Stockholders' Equity Attributable to Parent	(2,255,824)		(2,147,082)
Total liabilities and stockholders' equity	$ (2,598,528)		$ (2,451,983)