Condensed Consolidating Financials Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 242,755	$ 255,530	$ 392,017	$ 433,663
Short-term investments	69,821	79,655
Accounts receivable, net of allowances of $5,267 and $4,261, respectively	98,329	114,680
Prepaid expenses and other current assets	19,706	25,722
Deferred income taxes	0	7,218
Due from Affiliate, Current	0	0
Total current assets	430,611	482,805
Long-term investments	81,896	78,563
Property and equipment, net	56,370	57,442
Tradenames, net	124,754	118,965
Patent and patent licenses, net	17,344	18,841
Customer Relationships, Net	202,352	197,319
Goodwill	829,012	807,661
Other purchased intangibles, net	18,239	17,516
Investments in and Advances to Affiliates, Amount of Equity	0	0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	5,884	0
Other assets	5,372	4,607
Total assets	1,771,834	1,783,719
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	82,813	114,384
Income taxes payable	5,729	5,589
Deferred revenue, current	78,975	76,104
Capital Lease Obligations, Current	198	214
Deferred Tax Liabilities, Net, Current	0	363
Due to Affiliate, Current	0	0
Total current liabilities	167,715	196,654
Long-term Debt	594,406	592,037
Capital Lease Obligations, Noncurrent	139	148
Liability for uncertain tax positions	37,658	35,917
Deferred income taxes	40,637	43,989
Deferred revenue, non-current	5,688	6,538
Other long-term liabilities	17,547	18,228
Total liabilities	$ 863,790	$ 893,511
Commitments and contingencies
Common Stock, Value, Issued	$ 480	$ 479
Additional paid-in capital	295,633	292,064
Retained Earnings (Accumulated Deficit)	640,001	626,789
Accumulated Other Comprehensive Income (Loss), Net of Tax	(28,070)	(29,124)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	908,044	890,208
Total liabilities and stockholders' equity	1,771,834	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	36,637	55,516	199,815	226,790
Short-term investments	69,758	79,595
Accounts receivable, net of allowances of $5,267 and $4,261, respectively	0	0
Prepaid expenses and other current assets	6,556	6,887
Deferred income taxes	0	0
Due from Affiliate, Current	144,488	117,000
Total current assets	257,439	258,998
Long-term investments	81,896	78,563
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	1,091,470	1,051,927
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0	0
Other assets	0	8,219
Total assets	1,430,805	1,397,707
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	8,042	4,573
Income taxes payable	0	0
Deferred revenue, current	0	0
Capital Lease Obligations, Current	0	0
Deferred Tax Liabilities, Net, Current	0	511
Due to Affiliate, Current	135,424	121,263
Total current liabilities	143,466	126,347
Long-term Debt	348,396	354,437
Capital Lease Obligations, Noncurrent	0	0
Liability for uncertain tax positions	0	0
Deferred income taxes	29,447	24,936
Deferred revenue, non-current	0	0
Other long-term liabilities	1,450	1,779
Total liabilities	522,759	507,499
Commitments and contingencies	0	0
Preferred stock, $0.01 par value	0	0
Common Stock, Value, Issued	480	479
Additional paid-in capital	295,633	292,064
Retained Earnings (Accumulated Deficit)	611,845	595,216
Accumulated Other Comprehensive Income (Loss), Net of Tax	88	2,449
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	908,046	890,208
Total liabilities and stockholders' equity	1,430,805	1,397,707
j2 Cloud Services, Inc. [Member]
ASSETS
Cash and cash equivalents	4,536	9,975	17,516	36,810
Short-term investments	0	0
Accounts receivable, net of allowances of $5,267 and $4,261, respectively	12,922	10,679
Prepaid expenses and other current assets	1,977	8,500
Deferred income taxes	0	3,316
Due from Affiliate, Current	178,787	174,127
Total current assets	198,222	206,597
Long-term investments	0	0
Property and equipment, net	6,063	6,557
Tradenames, net	10,091	10,118
Patent and patent licenses, net	708	743
Customer Relationships, Net	1,005	1,193
Goodwill	56,296	56,296
Other purchased intangibles, net	4,205	4,218
Investments in and Advances to Affiliates, Amount of Equity	1,127,997	1,095,155
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	25,105	14,978
Other assets	162	1,167
Total assets	1,429,854	1,397,022
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	21,664	27,976
Income taxes payable	8,579	9,573
Deferred revenue, current	19,848	19,530
Capital Lease Obligations, Current	0	0
Deferred Tax Liabilities, Net, Current	0	0
Due to Affiliate, Current	0	0
Total current liabilities	50,091	57,079
Long-term Debt	246,010	246,749
Capital Lease Obligations, Noncurrent	0	0
Liability for uncertain tax positions	37,658	35,917
Deferred income taxes	0	0
Deferred revenue, non-current	3,888	4,667
Other long-term liabilities	737	683
Total liabilities	338,384	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	240,262	238,631
Retained Earnings (Accumulated Deficit)	851,000	813,058
Accumulated Other Comprehensive Income (Loss), Net of Tax	208	238
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,091,470	1,051,927
Total liabilities and stockholders' equity	1,429,854	1,397,022
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	201,582	190,039	174,686	170,063
Short-term investments	63	60
Accounts receivable, net of allowances of $5,267 and $4,261, respectively	85,539	104,131
Prepaid expenses and other current assets	14,023	14,319
Deferred income taxes	0	4,413
Due from Affiliate, Current	0	0
Total current assets	301,207	312,962
Long-term investments	0	0
Property and equipment, net	50,307	50,885
Tradenames, net	114,663	108,847
Patent and patent licenses, net	16,636	18,098
Customer Relationships, Net	201,347	196,126
Goodwill	772,716	751,365
Other purchased intangibles, net	14,034	13,298
Investments in and Advances to Affiliates, Amount of Equity	2	0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	2,176	(14,978)
Other assets	5,210	4,370
Total assets	1,478,298	1,440,973
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	53,239	81,965
Income taxes payable	0	0
Deferred revenue, current	59,127	56,574
Capital Lease Obligations, Current	198	214
Deferred Tax Liabilities, Net, Current	0	363
Due to Affiliate, Current	187,851	169,864
Total current liabilities	300,415	308,980
Long-term Debt	0	0
Capital Lease Obligations, Noncurrent	139	148
Liability for uncertain tax positions	0	0
Deferred income taxes	32,587	19,053
Deferred revenue, non-current	1,800	1,871
Other long-term liabilities	15,360	15,766
Total liabilities	350,301	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	525,732	524,031
Retained Earnings (Accumulated Deficit)	630,631	602,935
Accumulated Other Comprehensive Income (Loss), Net of Tax	(28,366)	(31,811)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,127,997	1,095,155
Total liabilities and stockholders' equity	1,478,298	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 $5,267 and $4,261, respectively	(132)	(130)
Prepaid expenses and other current assets	(2,850)	(3,984)
Deferred income taxes	0	(511)
Due from Affiliate, Current	(323,275)	(291,127)
Total current assets	(326,257)	(295,752)
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	(2,219,469)	(2,147,082)
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	(21,397)	0
Other assets	0	(9,149)
Total assets	(2,567,123)	(2,451,983)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(132)	(130)
Income taxes payable	(2,850)	(3,984)
Deferred revenue, current	0	0
Capital Lease Obligations, Current	0	0
Deferred Tax Liabilities, Net, Current	0	(511)
Due to Affiliate, Current	(323,275)	(291,127)
Total current liabilities	(326,257)	(295,752)
Long-term Debt	0	(9,149)
Capital Lease Obligations, Noncurrent	0	0
Liability for uncertain tax positions	0	0
Deferred income taxes	(21,397)	0
Deferred revenue, non-current	0	0
Other long-term liabilities	0	0
Total liabilities	(347,654)	(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	(765,994)	(762,662)
Retained Earnings (Accumulated Deficit)	(1,453,475)	(1,384,420)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(2,219,469)	(2,147,082)
Total liabilities and stockholders' equity	$ (2,567,123)	$ (2,451,983)