Condensed Consolidating Financials Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 125,327us-gaap_ProfitLoss	$ 107,522us-gaap_ProfitLoss	$ 121,663us-gaap_ProfitLoss
Depreciation and amortization	62,953	39,788	22,164
Accretion (Amortization) of Discounts and Premiums, Investments	1,334	1,796	1,603
Amortization of financing costs and discounts	5,045	613	249
Share-based Compensation	8,908us-gaap_ShareBasedCompensation	9,720us-gaap_ShareBasedCompensation	9,132us-gaap_ShareBasedCompensation
Excess Tax Benefit from Share-based Compensation, Operating Activities	(5,512)	(2,695)	(961)
Provision for doubtful accounts	4,702us-gaap_ProvisionForDoubtfulAccounts	3,135us-gaap_ProvisionForDoubtfulAccounts	4,289us-gaap_ProvisionForDoubtfulAccounts
Income (Loss) from Equity Method Investments	0	0	0
Deferred income taxes	(10,033)us-gaap_DeferredIncomeTaxExpenseBenefit	250us-gaap_DeferredIncomeTaxExpenseBenefit	1,150us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on disposal of fixed assets	0us-gaap_GainLossOnDispositionOfAssets	8us-gaap_GainLossOnDispositionOfAssets	54us-gaap_GainLossOnDispositionOfAssets
(Gain) loss on available-for-sale investments	(90)	66	(266)
Loss on extinguishment of debt and related interest expense	0	14,437	0
Increase (Decrease) in Accounts Receivable	(11,078)	(9,588)	(5,417)
Increase (Decrease) in Prepaid Expense and Other Assets	(3,212)	149	(2,028)
Increase (Decrease) in Other Operating Assets	(42)	168	(243)
Accounts payable and accrued expenses	(5,447)	9,126	5,138
Income taxes payable	10,797	667	4,139
Deferred revenue	(711)	12,368	1,612
Liability for uncertain tax positions	(6,313)	6,186	7,601
Other	603	(392)	32
Net Cash Provided by (Used in) Operating Activities	177,231	193,324	169,911
Maturity of certificates of deposit	14,520	42,615	8,000
Payments to Acquire Other Investments	(65)	(22,071)	(34,673)
Sales of available-for-sale investments	110,363	140,126	138,709
Payments to Acquire Available-for-sale Securities	(138,452)	(168,901)	(151,989)
Payments to Acquire Property, Plant, and Equipment	(11,829)	(18,627)	(5,061)
Proceeds from sale of assets	608	1	156
Payments to Acquire Businesses, Net of Cash Acquired	(245,278)	(126,341)	(198,341)
Payments to Acquire Intangible Assets	(5,336)	(14,200)	(6,295)
Payments to Acquire Interest in Subsidiaries and Affiliates	0	0	0
Payments for (Proceeds from) Other Investing Activities		0	0
Payments of Distributions to Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities	(275,469)	(167,398)	(249,494)
Proceeds from Issuance of Long-term Debt	(402,500)	0	(245,000)
Debt issuance costs	(11,991)us-gaap_PaymentsOfDebtIssuanceCosts	(47)us-gaap_PaymentsOfDebtIssuanceCosts	(1,384)us-gaap_PaymentsOfDebtIssuanceCosts
Payments for Repurchase of Common Stock	(5,663)	(4,587)	(60,282)
Issuance of common stock under employee stock purchase plan	265us-gaap_ProceedsFromStockPlans	213us-gaap_ProceedsFromStockPlans	157us-gaap_ProceedsFromStockPlans
Exercise of stock options	6,621	13,604	5,646
Proceeds from noncontrolling interests	0	0	8,557
Payments of Dividends	(52,269)us-gaap_PaymentsOfDividends	(45,134)us-gaap_PaymentsOfDividends	(40,263)us-gaap_PaymentsOfDividends
Excess tax benefits from share-based compensation	5,512	2,695	961
PaymentsOfDeferredConsiderationRelatedToAcquisition	(16,512)	0	0
Proceeds from (Payments for) Other Financing Activities	(933)	(2,437)	0
Net Cash Provided by (Used in) Financing Activities	327,530	(35,693)	158,392
Effect of exchange rate changes on cash and cash equivalents	(3,430)	(1,112)	512
Cash and Cash Equivalents, Period Increase (Decrease)	225,862	(10,879)	79,321
Cash and cash equivalents	433,663	207,801	218,680
j2 Global, Inc. [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	125,327	0	0
Depreciation and amortization	0	0	0
Accretion (Amortization) of Discounts and Premiums, Investments	392	0	0
Amortization of financing costs and discounts	4,297	0	0
Share-based Compensation	2,353	0	0
Excess Tax Benefit from Share-based Compensation, Operating Activities	(86)	0	0
Provision for doubtful accounts	0	0	0
Income (Loss) from Equity Method Investments	(135,838)	0	0
Deferred income taxes	(1,392)	0	0
Loss on disposal of fixed assets	0	0	0
(Gain) loss on available-for-sale investments	26	0	0
Loss on extinguishment of debt and related interest expense		0	0
Increase (Decrease) in Accounts Receivable	0	0	0
Increase (Decrease) in Prepaid Expense and Other Assets	(776)	0	0
Increase (Decrease) in Other Operating Assets	0	0	0
Accounts payable and accrued expenses	2,835	0	0
Income taxes payable	2,055	0	0
Deferred revenue	0	0	0
Liability for uncertain tax positions	0	0	0
Other	742	0	0
Net Cash Provided by (Used in) Operating Activities	(65)	0	0
Maturity of certificates of deposit	0	0	0
Payments to Acquire Other Investments	0	0	0
Sales of available-for-sale investments	40,211	0	0
Payments to Acquire Available-for-sale Securities	(81,061)	0	0
Payments to Acquire Property, Plant, and Equipment	0	0	0
Proceeds from sale of assets	0	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	0	0
Payments to Acquire Intangible Assets	0	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0	0	0
Payments for (Proceeds from) Other Investing Activities		0	0
Payments of Distributions to Affiliates	(96,509)	0	0
Net Cash Provided by (Used in) Investing Activities	(40,850)	0	0
Proceeds from Issuance of Long-term Debt	(402,500)	0	0
Debt issuance costs	(11,991)	0	0
Payments for Repurchase of Common Stock	(930)	0	0
Issuance of common stock under employee stock purchase plan	142	0	0
Exercise of stock options	1,374	0	0
Proceeds from noncontrolling interests	0	0	0
Payments of Dividends	(26,967)	0	0
Excess tax benefits from share-based compensation	86	0	0
PaymentsOfDeferredConsiderationRelatedToAcquisition	0	0	0
Proceeds from (Payments for) Other Financing Activities	0	0	0
Net Cash Provided by (Used in) Financing Activities	267,705	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	226,790	0	0
Cash and cash equivalents	226,790	0	0
j2 Cloud Services, Inc. [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	135,838	107,522	121,580
Depreciation and amortization	6,047	9,201	8,590
Accretion (Amortization) of Discounts and Premiums, Investments	722	1,273	1,461
Amortization of financing costs and discounts	748	613	249
Share-based Compensation	5,325	9,720	9,132
Excess Tax Benefit from Share-based Compensation, Operating Activities	(4,803)	(2,695)	(961)
Provision for doubtful accounts	2,114	1,219	293
Income (Loss) from Equity Method Investments	(77,051)	(61,551)	(91,539)
Deferred income taxes	(5,767)	(495)	4,839
Loss on disposal of fixed assets	0	0	54
(Gain) loss on available-for-sale investments	(58)	(51)	(266)
Loss on extinguishment of debt and related interest expense		0	0
Increase (Decrease) in Accounts Receivable	(2,490)	(1,656)	(822)
Increase (Decrease) in Prepaid Expense and Other Assets	(8,757)	784	(1,265)
Increase (Decrease) in Other Operating Assets	0	(57)	123
Accounts payable and accrued expenses	(1,173)	(124)	10,599
Income taxes payable	17,384	(923)	2,193
Deferred revenue	(2,067)	13,415	878
Liability for uncertain tax positions	(6,311)	6,184	7,601
Other	(157)	(88)	99
Net Cash Provided by (Used in) Operating Activities	59,544	82,291	72,838
Maturity of certificates of deposit	8,210	30,270	8,000
Payments to Acquire Other Investments	0	(16,375)	(22,106)
Sales of available-for-sale investments	53,563	124,745	138,709
Payments to Acquire Available-for-sale Securities	(57,391)	(149,748)	(139,087)
Payments to Acquire Property, Plant, and Equipment	(2,866)	(6,223)	(2,677)
Proceeds from sale of assets	608	1	136
Payments to Acquire Businesses, Net of Cash Acquired	(2,083)	(4,043)	(1,811)
Payments to Acquire Intangible Assets	(2,949)	(3,034)	(4,433)
Payments to Acquire Interest in Subsidiaries and Affiliates	(23,821)	(14,920)	(171,562)
Payments for (Proceeds from) Other Investing Activities		3,281	0
Payments of Distributions to Affiliates	(10,495)	(55,295)	3,746
Net Cash Provided by (Used in) Investing Activities	(26,729)	(36,046)	(194,831)
Proceeds from Issuance of Long-term Debt	0	0	245,000
Debt issuance costs	0	(47)	(1,384)
Payments for Repurchase of Common Stock	(4,733)	(4,587)	(60,282)
Issuance of common stock under employee stock purchase plan	123	213	157
Exercise of stock options	5,193	13,604	5,646
Proceeds from noncontrolling interests	0	0	0
Payments of Dividends	(25,302)	(45,134)	(40,263)
Excess tax benefits from share-based compensation	4,803	2,695	961
PaymentsOfDeferredConsiderationRelatedToAcquisition	0	0	0
Proceeds from (Payments for) Other Financing Activities	0	0	0
Net Cash Provided by (Used in) Financing Activities	(30,411)	(88,551)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	2,404	(42,306)	31,588
Cash and cash equivalents	36,810	34,406	76,712
Non-Guarantor Subsidiaries [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	77,051	61,551	91,622
Depreciation and amortization	56,906	30,587	13,574
Accretion (Amortization) of Discounts and Premiums, Investments	220	523	142
Amortization of financing costs and discounts	0	0	0
Share-based Compensation	1,230	0	0
Excess Tax Benefit from Share-based Compensation, Operating Activities	(623)	0	0
Provision for doubtful accounts	2,588	1,916	3,996
Income (Loss) from Equity Method Investments	0	0	0
Deferred income taxes	(2,874)	745	(3,689)
Loss on disposal of fixed assets	0	8	0
(Gain) loss on available-for-sale investments	(58)	117	0
Loss on extinguishment of debt and related interest expense		14,437	0
Increase (Decrease) in Accounts Receivable	(8,588)	(7,932)	(4,595)
Increase (Decrease) in Prepaid Expense and Other Assets	6,321	(635)	(763)
Increase (Decrease) in Other Operating Assets	(42)	225	(366)
Accounts payable and accrued expenses	(7,109)	9,250	(5,461)
Income taxes payable	(8,642)	1,590	1,946
Deferred revenue	1,356	(1,047)	734
Liability for uncertain tax positions	(2)	2	0
Other	18	(304)	(67)
Net Cash Provided by (Used in) Operating Activities	117,752	111,033	97,073
Maturity of certificates of deposit	6,310	12,345	0
Payments to Acquire Other Investments	(65)	(5,696)	(12,567)
Sales of available-for-sale investments	16,589	15,381	0
Payments to Acquire Available-for-sale Securities	0	(19,153)	(12,902)
Payments to Acquire Property, Plant, and Equipment	(8,963)	(12,404)	(2,384)
Proceeds from sale of assets	0	0	20
Payments to Acquire Businesses, Net of Cash Acquired	(243,195)	(122,298)	(196,530)
Payments to Acquire Intangible Assets	(2,387)	(11,166)	(1,862)
Payments to Acquire Interest in Subsidiaries and Affiliates	0	0	0
Payments for (Proceeds from) Other Investing Activities		(3,281)	0
Payments of Distributions to Affiliates	130,825	70,215	167,816
Net Cash Provided by (Used in) Investing Activities	(231,711)	(146,272)	(226,225)
Proceeds from Issuance of Long-term Debt	0	0	0
Debt issuance costs	0	0	0
Payments for Repurchase of Common Stock	0	0	0
Issuance of common stock under employee stock purchase plan	0	0	0
Exercise of stock options	54	0	0
Proceeds from noncontrolling interests	0	0	8,557
Payments of Dividends	0	0	0
Excess tax benefits from share-based compensation	623	0	0
PaymentsOfDeferredConsiderationRelatedToAcquisition	(16,512)	0	0
Proceeds from (Payments for) Other Financing Activities	(933)	(2,437)	0
Net Cash Provided by (Used in) Financing Activities	114,057	67,778
Effect of exchange rate changes on cash and cash equivalents	(3,430)	(1,112)	512
Cash and Cash Equivalents, Period Increase (Decrease)	(3,332)	31,427	47,733
Cash and cash equivalents	170,063	173,395	141,968
Consolidation, Eliminations [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(212,889)	(61,551)	(91,539)
Depreciation and amortization	0	0	0
Accretion (Amortization) of Discounts and Premiums, Investments	0	0	0
Amortization of financing costs and discounts	0	0	0
Share-based Compensation	0	0	0
Excess Tax Benefit from Share-based Compensation, Operating Activities	0	0	0
Provision for doubtful accounts	0	0	0
Income (Loss) from Equity Method Investments	212,889	61,551	91,539
Deferred income taxes	0	0	0
Loss on disposal of fixed assets	0	0	0
Loss on extinguishment of debt and related interest expense		0	0
Increase (Decrease) in Accounts Receivable	0	0	0
Increase (Decrease) in Prepaid Expense and Other Assets	0	0	0
Increase (Decrease) in Other Operating Assets	0	0
Accounts payable and accrued expenses	0	0	0
Income taxes payable	0	0	0
Deferred revenue	0	0	0
Liability for uncertain tax positions	0	0	0
Other	0	0	0
Net Cash Provided by (Used in) Operating Activities	0	0	0
Maturity of certificates of deposit	0	0	0
Payments to Acquire Other Investments	0	0	0
Sales of available-for-sale investments	0	0	0
Payments to Acquire Available-for-sale Securities	0	0	0
Payments to Acquire Property, Plant, and Equipment	0	0	0
Proceeds from sale of assets	0	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	0	0
Payments to Acquire Intangible Assets	0	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	23,821	14,920	171,562
Payments for (Proceeds from) Other Investing Activities		0	0
Payments of Distributions to Affiliates	(23,821)	(14,920)	(171,562)
Net Cash Provided by (Used in) Investing Activities	23,821	14,920	171,562
Proceeds from Issuance of Long-term Debt	0	0	0
Debt issuance costs	0	0	0
Payments for Repurchase of Common Stock	0	0	0
Issuance of common stock under employee stock purchase plan	0	0	0
Exercise of stock options	0	0
Proceeds from noncontrolling interests	0		0
Payments of Dividends	0	0	0
Excess tax benefits from share-based compensation	0	0	0
PaymentsOfDeferredConsiderationRelatedToAcquisition	0	0	0
Proceeds from (Payments for) Other Financing Activities	0	0	0
Net Cash Provided by (Used in) Financing Activities	(23,821)	(14,920)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	0	0
Cash and cash equivalents	$ 0	$ 0	$ 0

Increase Decrease In Liability For Uncertain Tax Positions

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Cash outflow representing the payment of all, or a portion, of the deferred purchase price of a business acquisition.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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