Condensed Consolidating Financials Condensed Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Cash and cash equivalents	$ 392,017	$ 433,663	$ 208,068	$ 207,801
Short-term investments	85,759us-gaap_ShortTermInvestments	96,206us-gaap_ShortTermInvestments
Accounts receivable, net of allowances of $3,802 and $3,685, respectively	82,572us-gaap_AccountsReceivableNetCurrent	91,699us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets	24,611	22,602
Deferred income taxes	2,146us-gaap_DeferredTaxAssetsNetCurrent	2,013us-gaap_DeferredTaxAssetsNetCurrent
Due from Affiliate, Current	0us-gaap_DueFromAffiliateCurrent	0us-gaap_DueFromAffiliateCurrent
Total current assets	587,105us-gaap_AssetsCurrent	646,183us-gaap_AssetsCurrent
Long-term investments	61,718us-gaap_LongTermInvestments	60,508us-gaap_LongTermInvestments
Property and equipment, net	36,618us-gaap_PropertyPlantAndEquipmentNet	38,217us-gaap_PropertyPlantAndEquipmentNet
Tradenames, net	105,854jcom_TradenamesNet	105,551jcom_TradenamesNet
Patent and patent licenses, net	22,968jcom_PatentAndPatentLicensesNet	24,927jcom_PatentAndPatentLicensesNet
Customer Relationships, Net	184,328jcom_CustomerRelationshipsNet	163,766jcom_CustomerRelationshipsNet
Goodwill	669,374us-gaap_Goodwill	635,675us-gaap_Goodwill
Other purchased intangibles, net	16,146us-gaap_OtherIntangibleAssetsNet	17,556us-gaap_OtherIntangibleAssetsNet
Investments in and Advances to Affiliates, Amount of Equity	0	0
Other assets	14,125us-gaap_OtherAssetsNoncurrent	12,819us-gaap_OtherAssetsNoncurrent
Total assets	1,698,236us-gaap_Assets	1,705,202us-gaap_Assets
Accounts payable and accrued expenses	81,008	95,310
Income taxes payable	2,959us-gaap_TaxesPayableCurrent	0us-gaap_TaxesPayableCurrent
Deferred revenue, current	73,278us-gaap_DeferredRevenueCurrent	63,457us-gaap_DeferredRevenueCurrent
Capital Lease Obligations, Current	441us-gaap_CapitalLeaseObligationsCurrent	258us-gaap_CapitalLeaseObligationsCurrent
Deferred Tax Liabilities, Net, Current	185us-gaap_DeferredTaxLiabilitiesCurrent	342us-gaap_DeferredTaxLiabilitiesCurrent
Due to Affiliate, Current	0us-gaap_DueToAffiliateCurrent	0us-gaap_DueToAffiliateCurrent
Total current liabilities	157,871us-gaap_LiabilitiesCurrent	159,367us-gaap_LiabilitiesCurrent
Long-term Debt	595,266us-gaap_LongTermDebt	593,350us-gaap_LongTermDebt
Capital Lease Obligations, Noncurrent	66	141
Liability for uncertain tax positions	40,145	37,551
Deferred income taxes	63,109	61,960
Deferred revenue, non-current	8,905us-gaap_DeferredRevenueNoncurrent	10,182us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities	17,915us-gaap_OtherLiabilitiesNoncurrent	22,416us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	883,277us-gaap_Liabilities	884,967us-gaap_Liabilities
Commitments and contingencies
Common Stock, Value, Issued	474us-gaap_CommonStockValue	474us-gaap_CommonStockValue
Additional paid-in capital	275,420us-gaap_AdditionalPaidInCapital	273,304us-gaap_AdditionalPaidInCapital
Retained Earnings (Accumulated Deficit)	561,049	553,584
Accumulated Other Comprehensive Income (Loss), Net of Tax	(21,984)	(7,127)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	814,959	820,235
Total liabilities and stockholders’ equity	1,698,236	1,705,202
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	199,815	226,790	0	0
Short-term investments	41,880	47,880
Accounts receivable, net of allowances of $3,802 and $3,685, respectively	326	0
Prepaid expenses and other current assets	737	776
Deferred income taxes	896	1,271
Due from Affiliate, Current	110,000	110,000
Total current assets	353,654	386,717
Long-term investments	52,619	55,452
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	839,108	826,289
Other assets	9,061	9,328
Total assets	1,254,442	1,277,786
Accounts payable and accrued expenses	4,798	2,834
Income taxes payable	2,959	0
Deferred revenue, current	0	0
Capital Lease Obligations, Current	0	0
Deferred Tax Liabilities, Net, Current	43	0
Due to Affiliate, Current	48,268	76,366
Total current liabilities	56,068	79,200
Long-term Debt	348,942	347,163
Capital Lease Obligations, Noncurrent	0	0
Liability for uncertain tax positions	0	0
Deferred income taxes	24,685	21,728
Deferred revenue, non-current	0	0
Other long-term liabilities	1,071	744
Total liabilities	430,766	448,835
Common Stock, Value, Issued	474	474
Additional paid-in capital	275,420	273,304
Retained Earnings (Accumulated Deficit)	547,697	555,158
Accumulated Other Comprehensive Income (Loss), Net of Tax	85	15
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	823,676	828,951
Total liabilities and stockholders’ equity	1,254,442	1,277,786
j2 Cloud Services, Inc. [Member]
Cash and cash equivalents	17,516	36,810	45,261	34,406
Short-term investments	43,819	48,261
Accounts receivable, net of allowances of $3,802 and $3,685, respectively	12,059	11,167
Prepaid expenses and other current assets	14,472	12,689
Deferred income taxes	0	0
Due from Affiliate, Current	91,474	74,938
Total current assets	179,340	183,865
Long-term investments	9,099	5,056
Property and equipment, net	7,567	8,011
Tradenames, net	10,199	10,231
Patent and patent licenses, net	850	886
Customer Relationships, Net	1,952	2,206
Goodwill	52,131	52,131
Other purchased intangibles, net	4,264	4,276
Investments in and Advances to Affiliates, Amount of Equity	909,081	900,681
Other assets	3,063	1,368
Total assets	1,177,546	1,168,711
Accounts payable and accrued expenses	23,185	28,414
Income taxes payable	103	0
Deferred revenue, current	20,774	23,091
Capital Lease Obligations, Current	0	0
Deferred Tax Liabilities, Net, Current	0	0
Due to Affiliate, Current	0	0
Total current liabilities	44,062	51,505
Long-term Debt	246,324	246,187
Capital Lease Obligations, Noncurrent	0	0
Liability for uncertain tax positions	40,145	37,551
Deferred income taxes	0	(1,837)
Deferred revenue, non-current	7,009	8,187
Other long-term liabilities	898	829
Total liabilities	338,438	342,422
Common Stock, Value, Issued	0	0
Additional paid-in capital	233,836	232,340
Retained Earnings (Accumulated Deficit)	595,691	584,591
Accumulated Other Comprehensive Income (Loss), Net of Tax	9,581	9,358
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	839,108	826,289
Total liabilities and stockholders’ equity	1,177,546	1,168,711
Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	174,686	170,063	162,807	173,395
Short-term investments	60	65
Accounts receivable, net of allowances of $3,802 and $3,685, respectively	70,187	80,532
Prepaid expenses and other current assets	9,505	9,137
Deferred income taxes	1,250	742
Due from Affiliate, Current	0	1,428
Total current assets	255,688	261,967
Long-term investments	0	0
Property and equipment, net	29,051	30,206
Tradenames, net	95,655	95,320
Patent and patent licenses, net	22,118	24,041
Customer Relationships, Net	182,376	161,560
Goodwill	617,243	583,544
Other purchased intangibles, net	11,882	13,280
Investments in and Advances to Affiliates, Amount of Equity	8,717	8,716
Other assets	2,001	2,123
Total assets	1,224,731	1,180,757
Accounts payable and accrued expenses	53,025	64,062
Income taxes payable	0	0
Deferred revenue, current	52,504	40,366
Capital Lease Obligations, Current	441	258
Deferred Tax Liabilities, Net, Current	142	342
Due to Affiliate, Current	153,206	110,000
Total current liabilities	259,318	215,028
Long-term Debt	0	0
Capital Lease Obligations, Noncurrent	66	141
Liability for uncertain tax positions	0	0
Deferred income taxes	38,424	42,069
Deferred revenue, non-current	1,896	1,995
Other long-term liabilities	15,946	20,843
Total liabilities	315,650	280,076
Common Stock, Value, Issued	0	0
Additional paid-in capital	421,684	421,676
Retained Earnings (Accumulated Deficit)	519,047	495,505
Accumulated Other Comprehensive Income (Loss), Net of Tax	(31,650)	(16,500)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	909,081	900,681
Total liabilities and stockholders’ equity	1,224,731	1,180,757
Consolidation, Eliminations [Member]
Cash and cash equivalents	0	0	0	0
Short-term investments	0	0
Accounts receivable, net of allowances of $3,802 and $3,685, respectively	0	0
Prepaid expenses and other current assets	(103)	0
Deferred income taxes	0	0
Due from Affiliate, Current	(201,474)	(186,366)
Total current assets	(201,577)	(186,366)
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	(1,756,906)	(1,735,686)
Other assets	0	0
Total assets	(1,958,483)	(1,922,052)
Accounts payable and accrued expenses	0	0
Income taxes payable	(103)	0
Deferred revenue, current	0	0
Capital Lease Obligations, Current	0	0
Deferred Tax Liabilities, Net, Current	0	0
Due to Affiliate, Current	(201,474)	(186,366)
Total current liabilities	(201,577)	(186,366)
Long-term Debt	0	0
Capital Lease Obligations, Noncurrent	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
Total liabilities	(201,577)	(186,366)
Common Stock, Value, Issued	0	0
Additional paid-in capital	(655,520)	(654,016)
Retained Earnings (Accumulated Deficit)	(1,101,386)	(1,081,670)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,756,906)	(1,735,686)
Total liabilities and stockholders’ equity	$ (1,958,483)	$ (1,922,052)

Gross carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

No definition available.