Ziff Davis (ZD) 10-K 3 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 25, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Entity Registrant Name	'J2 GLOBAL, INC.	'	'
Entity Central Index Key	'0001084048	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	47,306,782	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$1,094,593,306

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
ASSETS	'	'
Cash and cash equivalents	$207,801,000	$218,680,000
Short-term investments	90,789,000	105,054,000
Accounts receivable, net of allowances of $4,105 and $3,213, respectively	67,245,000	37,285,000
Prepaid expenses and other current assets	20,064,000	15,388,000
Deferred income taxes	3,126,000	1,092,000
Total current assets	389,025,000	377,499,000
Long-term investments	47,351,000	19,841,000
Property and equipment, net	31,200,000	19,599,000
Tradenames, net	83,108,000	71,409,000
Patent and patent licenses, net	28,530,000	19,329,000
Customer relationships, net	100,980,000	64,723,000
Goodwill	457,422,000	407,825,000
Other purchased intangibles, net	10,915,000	9,855,000
Deferred income taxes	1,845,000	1,852,000
Other assets	3,413,000	3,238,000
Total assets	1,153,789,000	995,170,000
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'
Accounts payable and accrued expenses	69,570,000	39,874,000
Income taxes payable	1,569,000	3,037,000
Deferred revenue	36,326,000	30,493,000
Liability for uncertain tax positions	5,535,000	5,523,000
Deferred income taxes	1,892,000	0
Total current liabilities	114,892,000	78,927,000
Total long-term debt, less current portion	245,670,000	'
Long-term Debt	245,670,000	245,194,000
Liability for uncertain tax positions	38,329,000	32,155,000
Deferred income taxes	35,833,000	32,393,000
Deferred Revenue, Noncurrent	11,189,000	1,609,000
Other long-term liabilities	1,458,000	1,557,000
Mandatorily redeemable financial instrument	0	8,740,000
Total liabilities	447,371,000	400,575,000
Commitments and contingencies	0	0
Preferred stock, $0.01 par value	5,064,000	'
Common stock, $0.01 par value. Authorized 95,000,000 at December 31, 2013 and 2012; total issued and outstanding 46,105,076 and 45,094,191 shares at December 31, 2013 and 2012, respectively;	461,000	451,000
Additional paid-in capital	216,872,000	169,542,000
Retained earnings	484,850,000	424,790,000
Accumulated other comprehensive loss	4,235,000	-88,000
Stockholders' equity attributable to j2 Global, Inc.	706,418,000	594,695,000
Stockholders' Equity Attributable to Noncontrolling Interest	0	-100,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	706,418,000	594,595,000
Total liabilities and stockholders' equity	1,153,789,000	995,170,000
Series A Preferred Stock [Member]	'	'
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'
Preferred stock, $0.01 par value	0	0
Series B Preferred Stock [Member]	'	'
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'
Preferred stock, $0.01 par value	$0	$0

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) Statement (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Allowance for Doubtful Accounts Receivable, Current	$4,105	$3,213
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	95,000,000	95,000,000
Common Stock, Shares, Issued	46,105,076	45,094,191
Common Stock, Shares, Outstanding	46,105,076	45,094,191
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Treasury Stock, Shares	0	0
Series A Preferred Stock [Member]	'	'
Preferred Stock, Shares Authorized	6,000	0
Preferred Stock, Shares Issued	5,064	0
Preferred Stock, Shares Outstanding	5,064	0
Series B Preferred Stock [Member]	'	'
Preferred Stock, Shares Authorized	20,000	0
Preferred Stock, Shares Issued	4,155	'
Preferred Stock, Shares Outstanding	4,155	0

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:	'	'	'
Revenues	$520,801	$371,396	$330,159
Cost of revenues (including share-based compensation of $756, $844 and $982 in 2013, 2012 and 2011, respectively)	86,893	67,013	60,613
Gross profit	433,908	304,383	269,546
Operating expenses:	'	'	'
Sales and marketing (including share-based compensation of $1,855, $1,543 and $1,431 in 2013, 2012 and 2011, respectively)	131,317	62,825	59,066
Research, development and engineering (including share-based compensation of $434, $459 and $477 in 2013, 2012 and 2011, respectively)	25,485	18,624	16,373
General and administrative (including share-based compensation of $6,675, $6,286, $6,103 in 2013, 2012 and 2011, respectively)	101,683	60,772	58,157
Total operating expenses	258,485	142,221	133,596
Operating earnings	175,423	162,162	135,950
Interest expense (income), net	21,254	7,650	-629
Other expense (income), net	11,472	-410	-537
Income before income taxes	142,697	154,922	137,116
Income tax expense	35,175	33,259	22,350
Net earnings attributable to j2 Global, Inc. common shareholders	107,522	121,580	114,766
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	107,522	121,663	114,766
Net Income (Loss) Attributable to Noncontrolling Interest	$0	$83	$0
Net earnings per common share:	'	'	'
Basic	$2.31	$2.63	$2.46
Diluted	$2.28	$2.61	$2.43
Weighted average shares outstanding:	'	'	'
Basic	45,548,767	45,459,712	45,799,615
Diluted	46,140,019	45,781,658	46,384,848
Cash dividends paid per common share	$0.98	$0.87	$0.41

Recovered_Sheet1

Consolidated Statements of Income (Parenthetical) Statement (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allocated Share-based Compensation Expense	$9,720	$9,132	$8,993
Cost of Sales [Member]	'	'	'
Allocated Share-based Compensation Expense	756	844	982
Selling and Marketing Expense [Member]	'	'	'
Allocated Share-based Compensation Expense	1,855	1,543	1,431
Research and Development Expense [Member]	'	'	'
Allocated Share-based Compensation Expense	434	459	477
General and Administrative Expense [Member]	'	'	'
Allocated Share-based Compensation Expense	$6,675	$6,286	$6,103

Consolidated_Statement_Of_Comp

Consolidated Statement Of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$107,522	$121,663	$114,766
Foreign currency translation adjustment, net of tax (benefit) of ($122), $196 and ($198) for the year ended 2013, 2012 and 2011, respectively	78	1,435	-840
Unrealized gain on available-for-sale investments, net of tax (benefit) of $2,447, $646 and ($142) for the year ended 2013, 2012 and 2011, respectively	4,245	1,954	-602
Other Comprehensive Income, net of tax	4,323	3,389	-1,442
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	111,845	125,052	113,324
Net Income (Loss) Attributable to Noncontrolling Interest	0	83	0
Comprehensive income attributable to j2 Global, Inc.	$111,845	$124,969	$113,324

Recovered_Sheet2

Consolidated Statement of Comprehensive Income (Parenthetical) Statement (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	($122)	$196	($198)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$2,447	$646	($142)

Consolidated_Statement_Of_Cash

Consolidated Statement Of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$107,522	$121,663	$114,766
Adjustments to reconcile net earnings to net cash provided by operating activities:	'	'	'
Depreciation and amortization	39,788	22,164	19,756
Amortization of discount or premium of investments	-1,796	-1,603	-941
Amortization of financing costs and discounts	613	249	0
Share-based compensation	9,720	9,132	8,968
Excess tax benefits from share-based compensation	2,695	961	13,561
Provision for doubtful accounts	3,135	4,289	6,900
Deferred income taxes	250	1,150	6,822
Loss on disposal of fixed assets	8	54	117
(Gain) loss on available-for-sale investments	66	-266	-552
Loss on extinguishment of debt and related interest expense	14,437	0	0
Decrease (increase) in:	'	'	'
Accounts receivable	9,588	5,417	9,509
Prepaid expenses and other current assets	-149	2,028	-4,261
Other assets	-168	243	-204
(Decrease) increase in:	'	'	'
Accounts payable and accrued expenses	9,126	5,138	847
Income taxes payable	667	4,139	9,679
Deferred revenue	12,368	1,612	8,664
Liability for uncertain tax positions	6,186	7,601	-7,786
Other	-392	32	231
Net cash provided by operating activities	193,324	169,911	150,748
Cash flows from investing activities:	'	'	'
Maturity of certificates of deposit	42,615	8,000	0
Purchase of certificates of deposit	-22,071	-34,673	-8,000
Sales of available-for-sale investments	140,126	138,709	29,777
Purchase of available-for-sale investments	-168,901	-151,989	-82,879
Purchases of property and equipment	-18,627	-5,061	-6,844
Proceeds from sale of assets	1	156	4
Acquisition of businesses, net of cash received	-126,341	-198,341	-3,926
Purchases of intangible assets	-14,200	-6,295	-4,312
Net cash used in investing activities	-167,398	-249,494	-76,180
Cash flows from financing activities:	'	'	'
Issuance of long-term debt	0	245,000	0
Debt issuance costs	-47	-1,384	0
Repurchases of common stock and restricted stock	-4,587	-60,282	-1,281
Issuance of common stock under employee stock purchase plan	213	157	142
Exercise of stock options	13,604	5,646	7,090
Proceeds from noncontrolling interests	0	8,557	0
Dividends paid	-45,134	-40,263	-19,174
Excess tax benefits from share-based compensation	2,695	961	13,561
Proceeds from (Payments for) Other Financing Activities	-2,437	0	0
Net cash (used in) provided by financing activities	-35,693	158,392	338
Effect of exchange rate changes on cash and cash equivalents	-1,112	512	-299
Net change in cash and cash equivalents	-10,879	79,321	74,607
Cash and cash equivalents at beginning of period	218,680	139,359	64,752
Cash and cash equivalents at end of period	$207,801	$218,680	$139,359

Consolidated_Statements_Of_Sto

Consolidated Statements Of Stockholders' Equity Statement (USD $)	3 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' equity attributable to j2 Global, Inc.	$706,418	$594,695	$706,418	$594,695	$554,375	$431,745
Stockholders' Equity Attributable to Noncontrolling Interest	0	-100	0	-100	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	706,418	594,595	706,418	594,595	554,375	431,745
Net earnings attributable to j2 Global, Inc. common shareholders	20,754	30,203	107,522	121,580	114,766	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	0	83	0	'
Comprehensive income attributable to j2 Global, Inc.	'	'	111,845	124,969	113,324	'
Preferred Stock, Accretion of Redemption Discount	'	'	0	-183	'	'
Additional paid-in capital	216,872	169,542	216,872	169,542	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	100	'	'	'
Common Stock, Shares, Issued	46,105,076	45,094,191	46,105,076	45,094,191	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	'	'	-569,204	-357,234	-1,820,678	'
Common Stock [Member]	'	'	'	'	'	'
Shares, Outstanding	46,105,076	45,094,191	46,105,076	45,094,191	55,389,636	53,700,629
Stockholders' equity attributable to j2 Global, Inc.	461	451	461	451	554	537
Stock Issued During Period, Shares, New Issues	'	'	234,025	'	'	'
Stock Issued During Period, Value, New Issues	'	'	2	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	'	'	569,204	357,234	1,820,678	'
Stock Issued During Period, Value, Stock Options Exercised	'	'	6	4	18	'
Stock Issued During Period, Shares, Employee Stock Purchase Plans	'	'	5,402	5,797	5,235	'
Stock Issued During Period, Value, Employee Stock Purchase Plan	'	'	0	0	0	'
Stock Issued During Period, Shares, Restricted Stock Award, Gross	'	'	308,082	204,052	155,024	'
Stock Issued During Period, Value, Restricted Stock Award, Gross	'	'	3	2	1	'
Common Shares Repurchased And Retired During Period Shares	'	'	-29,950	-10,806,648	-248,152	'
Common Shares Repurchased And Retired During Period Value	'	'	0	-108	-2	'
Stock Repurchased and Retired During Period, Shares	'	'	-75,878	-55,880	-43,778	'
Stock Repurchased and Retired During Period, Value	'	'	-1	-1	0	'
Series A Preferred Stock [Member]	'	'	'	'	'	'
Stock Issued During Period, Shares, New Issues	'	'	5,064	'	'	'
Stock Issued During Period, Value, New Issues	'	'	0	'	'	'
Additional paid-in capital	4,774	'	4,774	'	'	'
Series B Preferred Stock [Member]	'	'	'	'	'	'
Stock Issued During Period, Shares, New Issues	'	'	4,155	'	'	'
Stock Issued During Period, Value, New Issues	'	'	0	'	'	'
Additional paid-in capital	6,575	'	6,575	'	'	'
Additional Paid-in Capital [Member]	'	'	'	'	'	'
Stockholders' equity attributable to j2 Global, Inc.	216,872	169,542	216,872	169,542	197,374	164,769
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	22,900	'	'	'
Stock Issued During Period, Value, Stock Options Exercised	'	'	13,598	5,642	14,404	'
Stock Issued During Period, Value, Employee Stock Purchase Plan	'	'	213	157	142	'
Stock Issued During Period, Value, Restricted Stock Award, Gross	'	'	-3	-2	-1	'
Common Shares Repurchased And Retired During Period Value	'	'	-684	-42,580	-3,616	'
Stock Repurchased and Retired During Period, Value	'	'	-1,506	-1,093	-853	'
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	'	'	9,585	9,083	8,968	'
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	'	'	3,227	961	13,561	'
Treasury Stock [Member]	'	'	'	'	'	'
Shares, Outstanding	0	0	0	0	-8,680,568	-8,680,568
Stockholders' equity attributable to j2 Global, Inc.	0	0	0	0	-112,671	-112,671
Common Shares Repurchased And Retired During Period Shares	'	'	0	8,680,568	'	'
Common Shares Repurchased And Retired During Period Value	'	'	0	112,671	'	'
Retained Earnings [Member]	'	'	'	'	'	'
Stockholders' equity attributable to j2 Global, Inc.	484,850	424,790	484,850	424,790	472,595	381,145
Net earnings attributable to j2 Global, Inc. common shareholders	'	'	107,522	121,580	114,766	'
Dividends, Common Stock, Cash	'	'	-45,135	-40,263	-19,199	'
Common Shares Repurchased And Retired During Period Value	'	'	-2,395	-129,171	-4,142	'
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	'	'	68	49	25	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'	'	'
Stockholders' equity attributable to j2 Global, Inc.	4,235	-88	4,235	-88	-3,477	-2,035
Comprehensive income attributable to j2 Global, Inc.	'	'	$4,323	$3,389	($1,442)	'

The_Company

The Company	12 Months Ended
	Dec. 31, 2013
The Company [Abstract]	'
Nature of Operations [Text Block]	'
	The Company
	j2 Global, Inc., together with its subsidiaries (“j2 Global” or the "Company"), is a global provider of Internet services. Through our Business Cloud Services Division, the Company provides cloud services to businesses of all sizes, from individuals to enterprises, and license our intellectual property ("IP") to third parties. The Digital Media Division operates a portfolio of web properties providing technology, gaming and lifestyle content, and an innovative data-driven platform connecting advertisers with visitors to those properties and to visitors of third party websites that are part of the Division's advertising network.

Basis_Of_Presentation

Basis Of Presentation	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Significant Accounting Policies [Text Block]	'
	Basis of Presentation and Summary of Significant Accounting Policies
	(a)	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of j2 Global and its direct and indirect wholly-owned and less-than-wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
	(b)	Use of Estimates
	The preparation of consolidated financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, including judgments about investment classifications, and the reported amounts of net revenue and expenses during the reporting period. On an ongoing basis, management evaluates its estimates based on historical experience and on various other factors that the Company believes to be reasonable under the circumstances. Actual results could differ from those estimates.
	In the first quarter of 2011, the Company made a change in estimate regarding the remaining service obligations to its annual eFax® subscribers. As a result of system upgrades, the Company is now basing the estimate on the actual remaining service obligations to these customers. Due to this change, the Company recorded a one-time, non-cash increase to deferred revenues of $10.3 million with an equal offset to revenues. This change in estimate reduced net income by approximately $7.6 million, net of tax, and reduced basic and diluted earnings per share for the year ended December 31, 2011 by $0.17 and $0.16, respectively.
	(c)	Allowances for Doubtful Accounts
	j2 Global reserves for receivables it may not be able to collect. These reserves for the Company's Business Cloud Services are typically driven by the volume of credit card declines and past due invoices and are based on historical experience as well as an evaluation of current market conditions. These reserves for the Company's Digital Media segment are typically driven by past due invoices and are based on historical experience. On an ongoing basis, management evaluates the adequacy of these reserves.
	(d)	Revenue Recognition
	Business Cloud Services
	The Company's Business Cloud Services revenues substantially consist of monthly recurring subscription and usage-based fees, which are primarily paid in advance by credit card. In accordance with GAAP, the Company defers the portions of monthly, quarterly, semi-annually and annually recurring subscription and usage-based fees collected in advance and recognizes them in the period earned. Additionally, the Company defers and recognizes subscriber activation fees and related direct incremental costs over a subscriber's estimated useful life.
	j2 Global's Business Cloud Services also include patent license revenues generated under license agreements that provide for the payment of contractually determined fully paid-up or royalty-bearing license fees to j2 Global in exchange for the grant of non-exclusive, retroactive and future licenses to our intellectual property, including patented technology. Patent revenues may also consist of revenues generated from the sale of patents. Patent license revenues are recognized when earned over the term of the license agreements. With regard to fully paid-up license arrangements, the Company recognizes as revenue in the period the license agreement is executed the portion of the payment attributable to past use of the intellectual property and amortizes the remaining portion of such payments on a straight-line basis over the life of the licensed patent(s). With regard to royalty-bearing license arrangements, the Company recognizes revenues of license fees earned during the applicable period. With regard to patent sales, the Company recognizes as revenue in the period of the sale the amount of the purchase price over the carrying value of the patent(s) sold.
	The Business Cloud Services business also generates revenues by licensing certain technology to third parties. These licensing revenues are recognized when earned in accordance with the terms of the underlying agreement. Generally, revenue is recognized as the third party uses the licensed technology over the period.
	Digital Media
	The Company's Digital Media revenues primarily consist of revenues generated from the sale of advertising campaigns that are targeted to the Company's proprietary websites and to those websites operated by third parties that are part of the Digital Media business's advertising network. Revenues for these advertising campaigns are recognized as earned either when an ad is placed for viewing by a visitor to the appropriate web page or when the visitor "clicks through" on the ad, depending upon the terms with the individual advertiser.
	Revenues for Digital Media business-to-business operations consist of lead-generation campaigns for IT vendors and are recognized as earned when the Company delivers the qualified leads to the customer.
	j2 Global also generates Digital Media revenues through the license of certain assets to clients, for the clients' use in their own promotional materials or otherwise. Such assets may include logos, editorial reviews, or other copyrighted material. Revenues under such license agreements are recognized when the assets are delivered to the client. The Digital Media business also generates other types of revenues, including business listing fees, subscriptions to online publications, and from other sources. Such other revenues are recognized as earned.
	(e)	Fair Value Measurements
	j2 Global complies with the provisions of Financial Accounting Standards Board (“FASB”) ASC Topic No. 820, Fair Value Measurements and Disclosures (“ASC 820”), in measuring fair value and in disclosing fair value measurements. ASC 820 provides a framework for measuring fair value and expands the disclosures required for fair value measurements of financial and non-financial assets and liabilities.
	As of December 31, 2013 and December 31, 2012, the carrying value of cash and cash equivalents, short-term investments, accounts receivable, interest receivable, accounts payable, accrued expenses, interest payable, customer deposits and long-term debt are reflected in the financial statements at cost. With the exception of long-term debt, cost approximates fair value due to the short-term nature of such instruments. The fair value of the Company's senior unsecured notes was determined using the quoted market prices of debt instruments with similar terms and maturities. As of the same dates, the carrying value of other long-term liabilities approximated fair value as the related interest rates approximate rates currently available to j2 Global.
	(f)	Cash and Cash Equivalents
	j2 Global considers cash equivalents to be only those investments that are highly liquid, readily convertible to cash and with maturities of three months or less at the purchase date.
	(g)	Investments
	j2 Global accounts for its investments in debt and equity securities in accordance with FASB ASC Topic No. 320, Investments - Debt and Equity Securities (“ASC 320”). Debt investments are typically comprised of corporate and governmental debt securities. Equity securities recorded as available-for-sale represent strategic equity investments. j2 Global determines the appropriate classification of its investments at the time of acquisition and evaluates such determination at each balance sheet date. Held-to-maturity securities are those investments which the Company has the ability and intent to hold until maturity and are recorded at amortized cost. Available-for-sale securities are those investments j2 Global does not intend to hold to maturity and can be sold. Available-for-sale securities are carried at fair value with unrealized gains and losses included in other comprehensive income. Trading securities are carried at fair value, with unrealized gains and losses included in investment income. All securities are accounted for on a specific identification basis.
	(h)	Debt Issuance Costs and Debt Discount
	j2 Global capitalizes costs incurred with borrowing and issuance of debt securities and records debt discounts as a reduction to the debt amount. j2 Global capitalized costs incurred in connection with its sale of senior unsecured notes within long-term other assets and recorded the original purchase discount as a reduction to such notes (See Note 8 - Long Term Debt). These costs and discounts are amortized and included in interest expense over the life of the borrowing or term of the credit facility using the interest method.
	(i)	Concentration of Credit Risk
	All of the Company’s cash, cash equivalents and marketable securities are invested at major financial institutions primarily within the United States, United Kingdom and Ireland. These institutions are required to invest the Company’s cash in accordance with the Company’s investment policy with the principal objectives being preservation of capital, fulfillment of liquidity needs and above market returns commensurate with preservation of capital. The Company’s investment policy also requires that investments in marketable securities be in only highly rated instruments, with limitations on investing in securities of any single issuer. However, these investments are not insured against the possibility of a total or near complete loss of earnings or principal and are inherently subject to the credit risk related to the continued credit worthiness of the underlying issuer and general credit market risks. At December 31, 2013 and December 31, 2012, the Company’s cash and cash equivalents were maintained in accounts that are insured up to the limit determined by the applicable governmental agency. The Company's deposits held in qualifying financial institutions in Ireland are fully insured through March 28, 2018 to the extent on deposit prior to March 28, 2013. With respect to the Company's deposits with financial institutions in other jurisdictions, the insured amount held in other institutions is immaterial in comparison to the total amount of the Company’s cash and cash equivalents held by these institutions which is not insured. These institutions are primarily in the United States and United Kingdom, however, the Company has accounts within several other countries including Australia, Austria, China, France, Germany, Italy, Japan, New Zealand, the Netherlands and Poland.
	(j)	Foreign Currency
	Some of j2 Global's foreign subsidiaries use the local currency of their respective countries as their functional currency. Assets and liabilities are translated at exchange rates prevailing at the balance sheet dates. Revenues, costs and expenses are translated into U.S. Dollars at average exchange rates for the period. Gains and losses resulting from translation are recorded as a component of accumulated other comprehensive income/(loss). Net translation gain/ (loss) were $0.1 million, $1.4 million and $(0.8) million for the years ended December 31, 2013, 2012 and 2011, respectively. Realized gains and losses from foreign currency transactions are recognized within other expense (income)net.  Net transaction gain/ (loss) was $0.4 million, $(0.1) million and zero for the years ended December 31, 2013, 2012 and 2011, respectively.
	(k)	Property and Equipment
	Property and equipment are stated at cost. Equipment under capital leases is stated at the present value of the minimum lease payments. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives of property and equipment range from one to 10 years. Fixtures, which are comprised primarily of leasehold improvements and equipment under capital leases, are amortized on a straight-line basis over their estimated useful lives or for leasehold improvements, the related lease term, if less. The Company has capitalized certain internal use software and website development costs which are included in property and equipment. The estimated useful life of costs capitalized is evaluated for each specific project and ranges from 1 to 5 years.
	(l)	Long-Lived Assets
	j2 Global accounts for long-lived assets, which include property and equipment and identifiable intangible assets with finite useful lives (subject to amortization), in accordance with the provisions of FASB ASC Topic No. 360, Property, Plant, and Equipment (“ASC 360”), which requires that long-lived assets be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by comparing the carrying amount of an asset to the expected future net cash flows generated by the asset. If it is determined that the asset may not be recoverable, and if the carrying amount of an asset exceeds its estimated fair value, an impairment charge is recognized to the extent of the difference.
	j2 Global assessed whether events or changes in circumstances have occurred that potentially indicate the carrying amount of long-lived assets may not be recoverable. No impairment was recorded in fiscal year 2013, 2012 and 2011.
	(m)	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. Intangible assets resulting from the acquisitions of entities accounted for using the purchase method of accounting are recorded at the estimated fair value of the assets acquired. Identifiable intangible assets are comprised of purchased customer relationships, trademarks and trade names, developed technologies and other intangible assets. Intangible assets subject to amortization are amortized over the period of estimated economic benefit ranging from 1 to 20 years. In accordance with FASB ASC Topic No. 350, Intangibles - Goodwill and Other (“ASC 350”), goodwill and other intangible assets with indefinite lives are not amortized but tested annually for impairment or more frequently if j2 Global believes indicators of impairment exist. In connection with the annual impairment test for goodwill, the Company has the option to perform a qualitative assessment in determining whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company determines that it was more likely than not that the fair value of the reporting unit is less than its carrying amount, then it performs the impairment test upon goodwill. In connection with the annual impairment test for intangible assets, we have the option to perform a qualitative assessment in determining whether it is more likely than not that the fair value is less than its carrying amount, then we perform the impairment test upon intangible assets. The impairment test involves a two-step process. The first step involves comparing the fair values of the applicable reporting units with their aggregate carrying values, including goodwill. The Company generally determines the fair value of its reporting units using the income approach methodology of valuation. If the carrying value of a reporting unit exceeds the reporting unit's fair value, j2 Global performs the second step of the test to determine the amount of impairment loss. The second step involves measuring the impairment by comparing the implied fair values of the affected reporting unit's goodwill and intangible assets with the respective carrying values. j2 Global completed the required impairment review at the end of 2013, 2012 and 2011 and concluded that there were no impairments. Consequently, no impairment charges were recorded.
	(n)	Income Taxes
	j2 Global's income is subject to taxation in both the U.S. and numerous foreign jurisdictions. Significant judgment is required in evaluating the Company's tax positions and determining its provision for income taxes. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. j2 Global establishes reserves for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. These reserves for tax contingencies are established when the Company believes that certain positions might be challenged despite the Company's belief that its tax return positions are fully supportable. j2 Global adjusts these reserves in light of changing facts and circumstances, such as the outcome of a tax audit or lapse of a statute of limitations. The provision for income taxes includes the impact of reserve provisions and changes to reserves that are considered appropriate.
	j2 Global accounts for income taxes in accordance with FASB ASC Topic No. 740, Income Taxes (“ASC 740”), which requires that deferred tax assets and liabilities be recognized using enacted tax rates for the effect of temporary differences between the book and tax basis of recorded assets and liabilities. ASC 740 also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that some or all of the net deferred tax assets will not be realized. The valuation allowance is reviewed quarterly based upon the facts and circumstances known at the time. In assessing this valuation allowance, j2 Global reviews historical and future expected operating results and other factors, including its recent cumulative earnings experience, expectations of future taxable income by taxing jurisdiction and the carryforward periods available for tax reporting purposes, to determine whether it is more likely than not that deferred tax assets are realizable.
	ASC 740 provides guidance on the minimum threshold that an uncertain income tax benefit is required to meet before it can be recognized in the financial statements and applies to all income tax positions taken by a company. ASC 740 contains a two-step approach to recognizing and measuring uncertain income tax positions. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. If it is not more likely than not that the benefit will be sustained on its technical merits, no benefit will be recorded. Uncertain income tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold. j2 Global recognized accrued interest and penalties related to uncertain income tax positions in income tax expense on its consolidated statement of income.
	(o)	Share-Based Compensation
	j2 Global accounts for share-based awards in accordance with the provisions of FASB ASC Topic No. 718, Compensation - Stock Compensation (“ASC 718”). Accordingly, j2 Global measures share-based compensation expense at the grant date, based on the fair value of the award, and recognizes the expense over the employee's requisite service period using the straight-line method. The measurement of share-based compensation expense is based on several criteria, including but not limited to the valuation model used and associated input factors, such as expected term of the award, stock price volatility, risk free interest rate, dividend rate and award cancellation rate. These inputs are subjective and are determined using management's judgment. If differences arise between the assumptions used in determining share-based compensation expense and the actual factors, which become known over time, j2 Global may change the input factors used in determining future share-based compensation expense. Any such changes could materially impact the Company's results of operations in the period in which the changes are made and in periods thereafter. Beginning in the first quarter 2012, the Company estimates the expected term based upon the historical exercise behavior of our employees. Previously, the Company elected to use the simplified method for estimating the expected term. Under the simplified method, the expected term is equal to the midpoint between the vesting period and the contractual term of the stock option.
	j2 Global accounts for option grants to non-employees in accordance with FASB ASC Topic No. 505, Equity, whereby the fair value of such options is determined using the Black-Scholes option pricing model at the earlier of the date at which the non-employee's performance is complete or a performance commitment is reached.
	(p)	Earnings Per Common Share
	EPS is calculated pursuant to the two-class method as defined in ASC Topic No. 260, Earnings per Share (“ASC 260”), which specifies that all outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends or dividend equivalents are considered participating securities and should be included in the computation of EPS pursuant to the two-class method.
	Basic EPS is calculated by dividing net distributed and undistributed earnings allocated to common shareholders, excluding participating securities and the net income attributable to noncontrolling interest, by the weighted-average number of common shares outstanding. The Company's participating securities consist of its unvested share-based payment awards that contain rights to nonforfeitable dividends or dividend equivalents. Diluted EPS includes the determinants of basic EPS and, in addition, reflects the impact of other potentially dilutive shares outstanding during the period.  The dilutive effect of participating securities is calculated under the more dilutive of either the treasury method or the two-class method.
	(q)	Research, Development and Engineering
	Research, development and engineering costs are expensed as incurred. Costs for software development incurred subsequent to establishing technological feasibility, in the form of a working model, are capitalized and amortized over their estimated useful lives. To date, software development costs incurred after technological feasibility has been established have not been material.
	(r)	Segment Reporting
	FASB ASC Topic No. 280, Segment Reporting (“ASC 280”), establishes standards for the way that public business enterprises report information about operating segments in annual consolidated financial statements and requires that those enterprises report selected information about operating segments in interim financial reports. ASC 280 also establishes standards for related disclosures about products and services, geographic areas and major customers. As a result of the acquisition of Ziff Davis, Inc. as described in Note 3 - Business Acquisitions, the Company operates as two segments: (1) Business Cloud Services and (2) Digital Media.
	(s)	Advertising Costs
	Advertising costs are expensed as incurred. Advertising costs for the year ended December 31, 2013, 2012 and 2011 was $55.4 million, $48.1 million and $45.4 million, respectively.
	(t)	Sales Taxes
	The Company may collect sales taxes from certain customers which are remitted to governmental authorities as required and are excluded from revenues.
	(u)	Recent Accounting Pronouncements
	In July 2012, the FASB issued ASU No. 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment, which simplifies how entities test indefinite-lived intangible assets other than goodwill for impairment and permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of the indefinite-lived intangible asset is less than its carrying amount as a basis for determining whether it is necessary to perform a quantitative impairment test. This ASU is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012 (early adoption is permitted). The Company adopted this guidance and did not have a significant impact on the Company's consolidated financial position or results of operations.
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, which provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This ASU is effective for fiscal years beginning after December 15, 2013. The Company is currently assessing the impact, if any, from this update with the principal potential impact expected to be related to the presentation of unrecognized tax benefits on the condensed consolidated balance sheet.
	Reclassifications
	Certain prior year reported amounts have been reclassified to conform with the 2013 presentation.

Business_Acquisition

Business Acquisition	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Acquisition	'
	Business Acquisitions
	The Company acquired the following companies during fiscal 2013, in each case for cash: (a) IGN Entertainment, Inc. ("IGN"), an online publisher of video games, entertainment and men's lifestyle content; (b) MetroFax, Inc., a provider of online faxing services and advanced features; (c) Backup Connect BV, an online backup provider based in the Netherlands; (d) NetShelter, the largest community of technology publishers dedicated to consumer electronics, computing and mobile communications; (e) Email Protection Agency Limited, a UK-based provider of email security, email management and network security services; (f) TechBargains.com, the leading deal aggregation website for electronic products; and (g) other immaterial share and asset acquisitions in the Business Cloud Services segment.
	The consolidated statement of income, since the date of each acquisition, and balance sheet, as of December 31, 2013, reflect the results of operations of all 2013 acquisitions. For the year ended December 31, 2013, these acquisitions contributed $98.1 million to the Company's revenues. Net income contributed by these acquisitions was not separately identifiable due to j2 Global's integration activities. Total consideration for these transactions was $163.5 million, net of cash acquired and including $15.7 million in assumed liabilities consisting primarily of deferred revenues, trade accounts payable, other accrued liabilities and net deferred tax liabilities.
	The following table summarizes the allocation of the purchase consideration for these acquisitions (in thousands):
	Asset	Valuation
	Accounts Receivable	$	24,658
	Property and Equipment		3,274
	Other Assets		2,703
	Deferred Tax Asset		2,058
	Software		3,031
	Content		2,460
	Trade Name		18,581
	Customer Relationship		40,275
	Advertiser Relationship		11,770
	Other Intangibles		168
	Goodwill		54,472
	Total	$	163,450
	The initial accounting for these acquisitions is incomplete and subject to change, which may be significant. j2 Global has recorded provisional amounts for certain property and equipment, intangible assets (including trade names and software), preliminary working capital and related tax items with a corresponding net decrease to goodwill in the amount of $2.0 million related to IGN. The Company also recorded an adjustment to initial working capital related to the acquisition of Ziff Davis, Inc., which increased assumed liabilities with a corresponding increase to goodwill in the amount of $1.7 million. Actual amounts recorded upon finalization of the purchase accounting may differ materially from the information presented in this Annual Report on Form 10-K.
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired and represents intangible assets that do not qualify for separate recognition. Goodwill recognized associated with these acquisitions during the year ended December 31, 2013 is $54.5 million, of which $36.6 million is expected to be deductible for income tax purposes.
	Pro Forma Financial Information for 2013 Acquisitions
	The following unaudited pro forma supplemental information is based on estimates and assumptions, which j2 Global believes are reasonable. However, this information is not necessarily indicative of the Company's consolidated financial position or results of income in future periods or the results that actually would have been realized had j2 Global and the acquired businesses been combined companies during the periods presented. These pro forma results exclude any savings or synergies that would have resulted from these business acquisitions had they occurred on January 1, 2012 and do not take into consideration the exiting of any acquired lines of business. This unaudited pro forma supplemental information includes incremental intangible asset amortization and other charges as a result of the acquisitions, net of the related tax effects.
	The supplemental information on an unaudited pro forma financial basis presents the combined results of j2 Global and its 2013 acquisitions as if each acquisition had occurred on January 1, 2012 (in thousands, except per share amounts):
		Year ended
		December 31,		December 31,
		2013		2012
		(unaudited)		(unaudited)
	Revenues	$	545,952	$	470,190
	Net Income	$	108,600	$	122,187
	EPS - Basic	$	2.34	$	2.64
	EPS - Diluted	$	2.31	$	2.62
	2012
	Ziff Davis
	The Company acquired substantially all of the outstanding capital stock of Ziff Davis on November 9, 2012 for a cash purchase price of approximately $163.1 million, net of cash acquired and assumed liabilities of $28.8 million and subject to certain post-closing adjustments.
	The consolidated statement of income, since the date of the acquisition, and balance sheet as of December 31, 2012 reflect the results of operations of Ziff Davis. For the year ended December 31, 2012, Ziff Davis contributed $9.7 million to the Company's revenues and $1.6 million to its net income.
	The following table summarizes the allocation of the purchase consideration (including the portion allocable to the minority interest) as follows (in thousands):
	Asset	Valuation
	Accounts Receivable	$	14,450
	Property and Equipment		842
	Software		4,780
	Other Assets		1,283
	Deferred Tax Asset		1,139
	Trade Name		37,730
	Customer Relationship		5,380
	Advertiser Relationship		14,500
	Licensing Relationship		4,910
	Other Intangibles		2,540
	Goodwill		112,882
	Total	$	200,436
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired and represents intangible assets that do not qualify for separate recognition. Goodwill recognized associated with the acquisition of Ziff Davis during the year ended December 31, 2012 is 112.9 million, of which $12.9 million is expected to be deductible for income tax purposes.
	Other 2012 Acquisitions
	The consolidated statement of income, since the date of the applicable acquisitions, and balance sheet as of December 31, 2012 reflect the results of operations of all six 2012 acquisitions, including Ziff Davis as noted above. For the year ended December 31, 2012, the five acquisitions other than Ziff Davis (the "other acquisitions") contributed $16.9 million to the Company's revenues. Net income contributed by the other acquisitions was not separately identifiable due to j2 Global's integration activities.  Total consideration for the other acquisitions was $32.9 million, net of cash acquired. The financial impact to j2 Global for each of the other acquisitions, individually and in the aggregate, is immaterial as of the date of each acquisition.
	Pro Forma Financial Information for 2012 Acquisitions
	The following unaudited pro forma supplemental information is based on estimates and assumptions, which j2 Global believes are reasonable. However, this information is not necessarily indicative of the Company's consolidated financial position or results of income in future periods or the results that actually would have been realized had j2 Global and the acquired businesses been combined companies during the period presented. These pro forma results exclude any savings or synergies that would have resulted from these business acquisitions had they occurred on January 1 for the year ended December 31, 2011 and do not take into consideration the exiting of any acquired lines of business. This unaudited pro forma supplemental information includes incremental intangible asset amortization and other charges as a result of the acquisitions, net of the related tax effects.
	The supplemental information on an unaudited pro forma financial basis presents the combined results of j2 Global and its 2012 acquisitions as if each acquisition had occurred on January 1, 2011 (in thousands, except per share amounts):
		Year ended
		December 31,		December 31,
		2012		2011
		(unaudited)		(unaudited)
	Revenues	$	417,250	$	385,974
	Net Income	$	120,210	$	114,889
	EPS - Basic	$	2.6	$	2.47
	EPS - Diluted	$	2.58	$	2.44
	2011
In July 2011, the Company purchased for cash Data Haven Limited, an Ireland-based provider of online data backup services for businesses, and certain assets of the virtual PBX business of Buzz Networks Limited, a UK-based provider of voice services. In October 2011, the Company purchased for cash C Infinity, an Ireland-based provider of online data backup and hosting services for businesses. The financial impact to j2 Global for these transactions is immaterial as of the date of each acquisition. The consolidated statement of income, since the date of the applicable acquisition, and balance sheet as of December 31, 2011 reflect the results of operations of the acquisitions closed in 2011. Total consideration for these 2011 transactions was $3.8 million, net of cash acquired.

Investments

Investments	12 Months Ended
	Dec. 31, 2013
Investments [Abstract]	'
Investments	'
	Investments
	Short-term investments consist generally of corporate and governmental debt securities and certificates of deposits which are stated at fair market value. Realized gains and losses of short and long-term investments are recorded using the specific identification method.
	The following table summarizes j2 Global’s debt securities designated as available-for-sale, classified by the contractual maturity date of the security (in thousands):
		December 31,		December 31, 2012
		2013
	Due within 1 year	$	46,339	$	46,681
	Due within more than 1 year but less than 5 years	44,865		17,209
	Due within more than 5 years but less than 10 years	—		—
	Due 10 years or after	2,486		2,633
	Total	$	93,690	$	66,523
	The following table summarizes the Company’s investments designated as trading and available-for-sale (in thousands):
		December 31,		December 31, 2012
		2013
	Trading	$	—	$	3
	Available-for-sale	123,737		90,017
	Total	$	123,737	$	90,020
	The following table summarizes the gross unrealized gains and losses and fair values for investments as of December 31, 2013 and December 31, 2012 aggregated by major security type (in thousands):
		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
	December 31, 2013
	Debt Securities	$	93,569	$	158	$	(37	)	$	93,690
	Equity Securities	20,610		9,558		(121		)	30,047
	Total	$	114,179	$	9,716	$	(158	)	$	123,737
	December 31, 2012
	Debt Securities	$	66,541	$	149	$	(167	)	$	66,523
	Equity Securities	$	20,610	$	3,251	$	(367	)	$	23,494
	Total	$	87,151	$	3,400	$	(534	)	$	90,017
	At December 31, 2013 and 2012, corporate and governmental debt securities were recorded as available-for-sale. These debt securities have a fixed interest rate. There have been no significant changes in the maturity dates and average interest rates for the Company’s debt investment portfolio and debt obligations subsequent to December 31, 2013. At December 31, 2013, equity securities were recorded as available-for-sale and primarily represent a strategic investment in Carbonite, Inc. On August 31, 2012, j2 Global submitted a preliminary non-binding proposal to acquire all outstanding shares for cash consideration of $10.50 per fully diluted share, representing a substantial premium to the market trading price of the shares on such date.  At December 31, 2013, the Company’s available-for-sale securities are carried at fair value, with the unrealized gains and losses reported as a component of stockholders’ equity. Short-term investments include restricted balances which the Company may not liquidate until maturity, generally within 12 months. Restricted balances included in short-term investments were $8.2 million at December 31, 2013. For the year ended December 31, 2013, the Company recorded gain from the sale of investments of approximately $0.1 million. For the year ended December 31, 2012, the Company recorded gain from the sale of investments of approximately $0.3 million, which included a reversal of unrealized gains from accumulated other comprehensive income of approximately $0.1 million.
	Investments that have been in an unrealized loss position as of December 31, 2013 and December 31, 2012 had a fair value of $37.3 million and $31.8 million, respectively, and have been in a continuous unrealized loss for less than 12 months. Investments in a continuous unrealized loss for 12 months and longer as of December 31, 2013 and December 31, 2012 had a fair value of $2.0 million and $2.2 million, respectively, which are determined to be temporary in nature.
	Recognition and Measurement of Other-Than-Temporary Impairment
	j2 Global regularly reviews and evaluates each investment that has an unrealized loss. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Unrealized losses that are determined to be temporary in nature are recorded, net of tax, in accumulated other comprehensive income for available-for-sale securities, while such losses related to held-to-maturity securities are not recorded, as these investments are carried at their amortized cost.
	Regardless of the classification of the securities as available-for-sale or held-to-maturity, the Company has assessed each position for impairment.
	Factors considered in determining whether a loss is temporary include:
	•	the length of time and the extent to which fair value has been below cost;
	•	the severity of the impairment;
	•	the cause of the impairment and the financial condition and near-term prospects of the issuer;
	•	activity in the market of the issuer which may indicate adverse credit conditions; and
	•	the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery.
	j2 Global’s review for impairment generally entails:
	•	identification and evaluation of investments that have indications of possible impairment;
	•	analysis of individual investments that have fair values less than amortized cost, including consideration of the length of time the investment has been in an unrealized loss position and the expected recovery period;
	•	discussion of evidential matter, including an evaluation of factors or triggers that could cause individual investments to qualify as having an other-than-temporary impairment and those that would not support an other-than-temporary impairment;
	•	documentation of the results of these analyses, as required under business policies; and
	•	information provided by third-party valuation experts.
	For these securities, a critical component of the evaluation for other-than-temporary impairments is the identification of credit impairment, where management does not expect to receive cash flows sufficient to recover the entire amortized cost basis of the security. Credit impairment is assessed using a combination of a discounted cash flow model that estimates the cash flows on the underlying securities and a market comparables method, where the security is valued based upon indications from the secondary market of what discounts buyers demand when purchasing similar securities. The cash flow model incorporates actual cash flows from the securities through the current period and then projects the remaining cash flows using relevant interest rate curves over the remaining term. These cash flows are discounted using a number of assumptions, some of which include prevailing implied credit risk premiums, incremental credit spreads and illiquidity risk premiums, among others.
	Securities that have been identified as other-than-temporarily impaired are written down to their current fair value. For debt securities that are intended to be sold or that management believes it more-likely-than-not that will be required to sell prior to recovery, the full impairment is recognized immediately in earnings.
	For available-for-sale and held-to-maturity securities that management has no intent to sell and believes that it more-likely-than-not that it will not be required to sell prior to recovery, only the credit loss component of the impairment is recognized in earnings, while the rest of the fair value impairment is recognized in other comprehensive income. The credit loss component recognized in earnings is identified as the amount of principal cash flows not expected to be received over the remaining term of the security.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	Fair Value Measurements
	j2 Global complies with the provisions of ASC 820, which defines fair value, provides a framework for measuring fair value and expands the disclosures required for fair value measurements of financial and non-financial assets and liabilities. ASC 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or a liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier value hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:
		§	Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
		§	Level 2 – Include other inputs that are directly or indirectly observable in the marketplace.
		§	Level 3 – Unobservable inputs which are supported by little or no market activity.
	The fair value hierarchy also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.
	The Company measures its cash equivalents and investments at fair value. j2 Global’s cash equivalents, short-term investments and other debt securities are primarily classified within Level 1. Cash equivalents and marketable securities are valued primarily using quoted market prices utilizing market observable inputs. The fair value of the senior unsecured notes (See Note 8 - Long-Term Debt) was determined using the quoted market prices of debt instruments with similar terms, credit rating and maturities, which are considered Level 2 inputs. The total carrying value of long-term debt was $245.7 million and $245.2 million, and the corresponding fair value was approximately $283.3 million and $275.5 million, at December 31, 2013 and December 31, 2012, respectively.
	The following tables present the fair values of the Company’s financial instruments that are measured at fair value on a recurring basis (in thousands):
	December 31, 2013	Level 1		Level 2		Level 3		Fair Value
	Cash equivalents:
	Money market and other funds	101,232		—		—		101,232
	Time deposits	22,773		—		—		22,773
	Certificates of Deposit	14,402		—		—		14,402
	Equity securities	30,047		—		—		30,047
	Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	23,702		—		—		23,702
	Debt securities issued by states of the United States and political subdivisions of the states	3,296		—		—		3,296
	Debt securities issued by foreign governments	—		—		—		—
	Corporate debt securities	66,692		—		—		66,692
	Total	$	262,144	$	—	$	—	$	262,144
	December 31, 2012	Level 1		Level 2		Level 3		Fair Value
	Cash equivalents:
	Money market and other funds	99,351		—		—		99,351
	Time deposits	22,093		—		—		22,093
	Certificates of Deposit	34,876		—		—		34,876
	Equity securities	23,497		—		—		23,497
	Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	6,450		—		—		6,450
	Debt securities issued by states of the United States and political subdivisions of the states	11,658		—		—		11,658
	Debt securities issued by foreign governments	3,589		—		—		3,589
	Corporate debt securities	44,826		—		—		44,826
	Total	$	246,340	$	—	$	—	$	246,340
	Losses associated with other-than-temporary impairments are recorded as a component of other income (expenses). Gains and losses not associated with other-than-temporary impairments are recorded as a component of other comprehensive income.

Property_And_Equipment

Property And Equipment	12 Months Ended
	Dec. 31, 2013
Property And Equipment [Abstract]	'
Property, Plant and Equipment Disclosure [Text Block]	'
	Property and Equipment
	Property and equipment, stated at cost, at December 31, 2013 and 2012 consisted of the following (in thousands):
		2013			2012
	Computers and related equipment	$	79,576		$	61,471
	Furniture and equipment	1,405			1,300
	Leasehold improvements	5,718			3,938
		86,699			66,709
	Less: Accumulated depreciation and amortization	(55,499		)	(47,110		)
	Total property and equipment, net	$	31,200		$	19,599
	Depreciation and amortization expense was $9.6 million, $6.2 million and $6.3 million for the year ended December 31, 2013, 2012 and 2011, respectively.
	Total disposals of long-lived assets for the year ended December 31, 2013, 2012 and 2011 was $0.9 million, $0.9 million and $0.3 million, respectively.

Goodwill_And_Intangible_Assets

Goodwill And Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill And Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. Identifiable intangible assets are comprised of purchased customer relationships, trademarks and trade names, developed technologies and other intangible assets. Intangible assets resulting from the acquisitions of entities accounted for using the purchase method of accounting are recorded at the estimated fair value of the assets acquired. The fair values of these identified intangible assets are based upon expected future cash flows or income, which take into consideration certain assumptions such as customer turnover, trade names and patent lives. These determinations are primarily based upon the Company’s historical experience and expected benefit of each intangible asset. If it is determined that such assumptions are not accurate, then the resulting change will impact the fair value of the intangible asset. Identifiable intangible assets are amortized over the period of estimated economic benefit, which ranges from one to 20 years.
	The changes in carrying amounts of goodwill for the year ended December 31, 2013 and 2012 are as follows (in thousands):
	Balance as of January 1, 2012	$	279,016
	Goodwill acquired	128,532
	Foreign Exchange Translation	277
	Balance as of December 31, 2012	$	407,825
	Goodwill acquired	54,472
	Purchase Accounting Adjustments	(5,324		)
	Foreign exchange translation	449
	Balance as of December 31, 2013	$	457,422
	See Note 3 - Business Acquisitions - for a discussion related to purchase accounting adjustments.
	Intangible assets are summarized as of December 31, 2013 and 2012 as follows (in thousands):
	Intangible Assets with Indefinite Lives:
		2013				2012
	Trade name	$	27,379			$	27,379
	Other	5,432				5,433
	Total	$	32,811			$	32,812
	In accordance with ASC 350, the Company performed the annual impairment test for goodwill for fiscal year 2013 using a qualitative assessment primarily taking into consideration macroeconomic, industry and market conditions, overall financial performance and any other relevant company-specific events. The Company performed the annual impairment test for intangible assets with indefinite lives for fiscal 2013 using a quantitative assessment primarily taking into consideration a discounted cash flow analysis of the relief of royalty payments. j2 Global concluded that there were no impairments in 2013, 2012 and 2011. The Company determined that a certain trade name no longer had an indefinite life as of the second quarter 2012. Accordingly, the Company reclassified $0.9 million from intangible assets with indefinite lives to intangible assets subject to amortization during fiscal year 2012. The Company has determined that this intangible asset had a remaining useful life of 1.5 years and is being amortized accordingly.
	Intangible Assets Subject to Amortization:
	As of December 31, 2013, intangible assets subject to amortization relate primarily to the following (in thousands):
		Weighted-Average		Historical				Accumulated		Net
		Amortization		Cost				Amortization
		Period
	Trade names	17.0 years		$	66,911			$	11,182	$	55,729
	Patent and patent licenses	8.1 years		58,446				29,916		28,530
	Customer relationships	8.1 years		139,362				38,382		100,980
	Other purchased intangibles	5.0 years		18,149				12,666		5,483
	Total			$	282,868			$	92,146	$	190,722
	As of December 31, 2012, intangible assets subject to amortization relate primarily to the following (in thousands):
		Weighted-Average		Historical				Accumulated		Net
		Amortization		Cost				Amortization
		Period
	Trade names	17.7 years		$	50,257			$	6,227	$	44,030
	Patent and patent licenses	8.2 years		44,048				24,719		19,329
	Customer relationships	7.0 years		86,473				21,750		64,723
	Other purchased intangibles	4.4 years		13,322				8,900		4,422
	Total			$	194,100			$	61,596	$	132,504
	Expected amortization expense for intangible assets subject to amortization at December 31, 2013 are as follows (in thousands):
	Fiscal Year:
	2014	$	34,743
	2015	30,186
	2016	26,506
	2017	23,023
	2018	16,118
	Thereafter	60,146
	Total expected amortization expense	$	190,722
	Amortization expense was $30.2 million, $16.0 million and $13.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Long_Term_Debt

Long Term Debt	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Debt Disclosure [Text Block]	'
	Long-Term Debt
	On July 26, 2012, j2 Global issued in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended, $250 million aggregate principal amount of 8.0% senior unsecured notes (the “Notes”) due August 1, 2020. j2 Global received proceeds of $245 million in cash, net of initial purchaser's discounts and commissions of $5 million. As of December 31, 2013, the unamortized discount on long-term debt was approximately $4.3 million. Other fees of approximately $1.2 million were incurred in connection with the issuance of the Notes and recorded in long-term other assets. The net proceeds were available for general corporate purposes, including acquisitions. Interest is payable semi-annually on February 1 and August 1 of each year beginning on February 1, 2013. j2 Global has the option to call the Notes in whole or in part after August 1, 2016, subject to certain premiums as defined in the indenture governing the Notes plus accrued and unpaid interest. In addition, at any time before August 1, 2016, j2 Global may redeem the Notes in whole or in part at a "make-whole" redemption price specified in the indenture plus accrued and unpaid interest, if any, to (but not including) the redemption date. Also, j2 Global may redeem up to 35% of the aggregate principal amount of the Notes using proceeds from certain public offerings of its equity securities at a price equal to 108% of the principal amount plus accrued and unpaid interest, if any, prior to August 1, 2015. Upon a change in control, the holders may put the Notes at 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the repurchase date. The Notes are not guaranteed by any of the j2 Global's subsidiaries as of December 31, 2013, because, as of such date, all of j2 Global's existing domestic restricted subsidiaries are deemed insignificant subsidiaries (as that term is defined in the indenture). If j2 Global or any of its restricted subsidiaries acquires or creates a domestic restricted subsidiary, other than an insignificant subsidiary, after the issue date, or any insignificant subsidiary ceases to fit within the definition of insignificant subsidiary, such restricted subsidiary is required to unconditionally guarantee, jointly and severally, on an unsecured basis, j2 Global's obligations under the Notes.
	The indenture to the Notes contain certain restrictive and other covenants applicable to j2 Global and subsidiaries designated as restricted subsidiaries including, but not limited to, limitations on debt and disqualified or preferred stock, restricted payments, liens, sale and leaseback transactions, dividends and other payment restrictions, asset sales and transactions with affiliates. As of December 31, 2013, j2 Global was in compliance with all such covenants. Violation of these covenants could result in a default which could result in the acceleration of outstanding amounts if such default is not cured or waived within the time periods outlined in the indenture agreement.
	The amount recorded in long-term debt in the consolidated balance sheet for the Notes is equal to the aggregate principal amount of the Notes, net of initial purchaser's discounts. The estimated fair value of the Notes was $283.3 million as of December 31, 2013 and was based on the quoted market prices of debt instruments with similar terms, credit rating and maturities of the Notes as of December 31, 2013.
	Long-term debt as of December 31, 2013 consists of the following (in thousands):
	Notes	$	245,670
	Total long-term debt	$	245,670
	Less: Current portion	—
	Total long-term debt, less current portion	$	245,670
	At December 31, 2013, future principal payments for debt were as follows (in thousands):
	Year Ended December 31,
	2014	$	—
	2015	—
	2016	—
	2017	—
	2018	—
	Thereafter	250,000
		$	250,000

Mandatorily_Redeemable_Financi

Mandatorily Redeemable Financial Instrument (Notes)	12 Months Ended
	Dec. 31, 2013
Mandatorily Redeemable Financial Instrument [Abstract]	'
Mandatorily Redeemable Financial Instrument [Text Block]	'
	Mandatorily Redeemable Financial Instrument
	On November 9, 2012, the Company acquired substantially all of the issued and outstanding capital stock of Ziff Davis, Inc. ("Ziff Davis"). In connection with the acquisition, the issued and outstanding capital stock was exchanged for shares of Series A Cumulative Participating Preferred Stock ("Series A Stock") of Ziff Davis. Ziff Davis is accounted for as a consolidated subsidiary as of the date of acquisition. Certain minority interest holders received an ownership in Series A Stock which has been accounted for as a non-controlling interest. On December 31, 2013, in connection with a reorganization of Ziff Davis, Inc. to Ziff Davis, LLC (the "Reorganization"), the Company acquired all of the minority interest holders' equity interests, including their Series A Stock.
	The Series A Stock bore a 15% annual cumulative dividend, compounded quarterly, whether or not earned or declared and whether or not there are funds legally available for payment of dividends. The Series A Stock was subject to mandatory repayment or redemption on November 9, 2017, which Ziff Davis could repay or redeem the Series A at its option prior to the mandatory repayment or redemption date. The repayment amount represented $1,000 for each share of Series A Stock and all accrued but unpaid dividends, subject to certain reduction when repaid. The redemption amount represented $1,000 for each share of Series A Stock and all accrued but unpaid dividends plus the fair market value of a notional number of shares of Ziff Davis common stock on a basis of 485 5/7 common shares per share of Series A Stock.
	The Series A Stock met the definition of a mandatorily redeemable financial instrument which requires liability classification and remeasurement at each reporting period on the consolidated subsidiaries financial statements. As the fair value of the Series A Stock was less than the mandatory redemption amount at issuance, periodic accretions using the interest method were made so that the carrying amount equaled the redemption amount on the mandatory redemption date.
	In connection with Reorganization, the Company issued to the minority holders shares of j2 common stock, j2 Series A Preferred Stock and j2 Series B Preferred Stock equal to the fair market value of the minority holders' Series A Stock (see Note 12 - Stockholders' Equity). As a result of the Reorganization, the Series A Stock was extinguished, resulting in loss on extinguishment of debt and related interest expense of $14.4 million within the consolidated statement of income, in accordance with ASC 480, Distinguishing Liabilities from Equity.

Commitments_And_Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	Commitments and Contingencies
	Litigation
	From time-to-time, j2 Global is involved in litigation and other disputes or regulatory inquiries that arise in the ordinary course of its business. Many of these actions involve or are filed in response to patent actions filed by j2 Global against others. The number and significance of these disputes and inquiries has increased as our business has expanded and j2 Global has grown. Any claims or regulatory actions against j2 Global, whether meritorious or not, could be time-consuming, result in costly litigation, require significant management time and result in diversion of significant operational resources.
	As part of the Company’s continuing effort to prevent the unauthorized use of its intellectual property, j2 Global has brought claims against several companies for infringing its patents relating to online fax, voice and other messaging technologies, including, among others, Nextiva, Inc. (“Nextiva”), Vitelity Communications, Inc. (“Vitelity”), EC Data Systems, Inc. (“EC Data”) and Integrated Global Concepts, Inc. (“IGC”).
	On August 5, 2011, j2 Global and one of its affiliates filed suit in the United States District Court for the Central District of California (the “Central District of California”) against Nextiva, alleging infringement of U.S. Patents Nos. 6,208,638 (the “‘638 Patent”), 6,350,066 (the “‘066 Patent”) and 7,020,132 (the “’132 Patent”). On July 23, 2013, j2 Global filed an amended complaint, adding a claim for infringement of U.S. Patent No. 6,020,980 (the “‘980 Patent”). On November 15, 2013, Nextiva filed its second amended answer and counterclaims for non-infringement and invalidity of the ‘638, ‘066, ‘132 and ‘980 Patents; unenforceability of the ‘980 Patent; unfair competition in violation of California’s Business & Professions Code § 17200, et. seq.; and prohibited restraints on competition and unfair practices in violation of California’s Business & Professions Code §§ 16720, et. seq. and 17000, et. seq. On December 6, 2013, j2 Global and its affiliate moved to dismiss Nextiva’s counterclaims for prohibited restraints on competition and unfair practices. On February 7, 2014, this action was dismissed pursuant to a settlement agreement.
	On September 23, 2011, j2 Global and one of its affiliates filed suit against Vitelity in the Central District of California, alleging infringement of the ‘638 and ‘066 Patents. On June 15, 2012, Vitelity filed counterclaims for invalidity and non-infringement of the ‘638 and ‘066 Patents. On September 13, 2013, the Court entered its Claim Construction Order. Discovery is ongoing. The fact discovery cutoff is currently set for February 28, 2014 and trial is set for October 14, 2014.
	On February 21, 2012, EC Data filed a complaint against j2 Global and one of its affiliates in the United District Court for the District of Colorado, seeking declaratory judgment of non-infringement of the ‘638 and ‘066 Patents. On April 9, 2012, j2 Global filed an answer to the complaint and counterclaims asserting that EC Data infringes these and other patents. On October 25, 2013, EC Data filed an amended complaint asserting claims for declaratory judgments of non-infringement and invalidity of the ‘638, ‘132, and ‘066 Patents, and U.S. Patent No. 6,597,688 (the “‘688 Patent”). On August 29, 2012, the Court granted j2 Global’s motion to transfer the case to the Central District of California. On September 13, 2013, the Court entered its Claim Construction Order. Discovery is ongoing. The fact discovery cutoff is currently set for February 28, 2014 and trial is set for November 18, 2014. On May 31, 2012, EC Data submitted a request to the United States Patent and Trademark Office (“USPTO”) to submit the ‘132 Patent into inter-partes reexamination proceedings. On April 25, 2013, the USPTO issued an Action Closing Prosecution and on July 26, 2013 a second Action Closing Prosecution. On November 27, 2013, j2 filed a Notice of Appeal. On January 27, 2014, j2 filed its brief in support of its appeal with the Patent Trial and Appeal Board.
	On June 28, 2013, j2 Global filed suit against EC Data in the Central District of California, alleging infringement of the ‘980 Patent. On October 4, 2013, EC Data filed its amended answer and counterclaims for non-infringement and invalidity of the ‘980 Patent.
	On October 16, 2013, one of j2 Global’s affiliates entered its appearance as a plaintiff in a multi-district litigation proceeding entitled In re: Unified Messaging Solutions LLC and Advanced Messaging Technologies, Inc. Patent Litigation (N.D. Ill. Master Docket No. 12 C 6286). In that litigation, a company with certain rights to assert patents owned by the j2 Global affiliate has asserted those patents against a number of defendants, and those defendants have filed counterclaims for, inter alia, non-infringement, unenforceability, and invalidity of U.S. Patent Nos. 6,857,074; 7,836,141; 7,895,306; 7,895,313 and 7,934,148.
	On August 28, 2013, Phyllis A. Huster (“Huster”) filed suit in the United States District Court for the Northern District of Illinois against Unified Messaging Solutions, LLC, Acacia Patent Acquisition LLC (“Acacia”), Charles R. Bobo, II (“Bobo”), j2 Global, and one of j2 Global’s affiliates for correction of inventorship of the ‘066 Patent and U.S. Patents Nos. 5,675,507; 5,870,549; 6,564,321; 6,857,074; 7,895,306; 7,836,141; 7,895,313 and 7,934,148. Huster seeks a declaration that she was the inventor of the patents at issue, an order directing the USPTO to substitute or add Huster as inventor of the patents at issue, an order that the defendants pay to Huster at least half of all earnings from licensing and sales of rights in the patents at issue, and costs and attorneys’ fees. On October 28, 2013, j2 Global, the j2 Global affiliate, and the other defendants in the case filed a motion to dismiss Huster’s action on the basis of improper venue and on the basis that Huster’s action is barred by laches. The defendants also filed a motion to strike certain portions of Huster’s prayer for relief. On the same day, j2 Global filed a motion to dismiss on the basis that it is not a proper party to Huster’s action; Bobo filed a motion to dismiss for lack of personal jurisdiction; and Acacia filed a motion to dismiss on the basis of lack of subject matter jurisdiction. Those motions remain pending.
	On September 15, 2006, one of j2 Global’s affiliates filed a patent infringement suit against IGC in the United States District Court for the Northern District of Georgia (the “Northern District of Georgia”). On May 13, 2008, IGC filed counterclaims alleging violations of Section 2 of the Sherman Act and breach of contract. IGC is seeking damages, including treble and punitive damages, an injunction against further violations, divestiture of certain assets, and attorneys’ fees and costs. On February 18, 2009, the Court granted the j2 Global affiliate’s motion to stay the case pending the conclusion of the j2 Global affiliate’s appeal of a summary judgment ruling of non-infringement in another case involving the same patents and issues as this action. On January 22, 2010, the United States Court of Appeals for the Federal Circuit affirmed the non-infringement ruling in the other case and on June 7, 2010 the Court lifted the stay. On September 2, 2011, the Northern District of Georgia Court granted the j2 Global affiliate’s motion to dismiss IGC’s breach of contract counterclaim and one portion of IGC’s antitrust counterclaim. On October 21, 2011, IGC filed a motion to strike certain of the affirmative defenses asserted by the j2 Global affiliate, which the Northern District of Georgia Court granted in part on July 26, 2012, striking certain of the affirmative defenses at issue. Following additional discovery, on June 20, 2012, the j2 Global affiliate filed a motion to dismiss its infringement claims and IGC's counterclaims for declaratory relief. On July 27, 2012, the Northern District of Georgia Court granted the j2 Global affiliate’s motion to dismiss, dismissing the j2 Global affiliate’s infringement claims and IGC’s related declaratory judgment counterclaims. On June 28, 2013, the Court bifurcated discovery, with the first stage of discovery limited to the issue of whether the j2 Global affiliate’s infringement claims were objectively baseless. The period for discovery into that issue ended on February 3, 2014. Also on February 3, 2014, IGC moved for leave to file amended counterclaims to assert a breach of contract claim. That motion remains pending.
	On July 2, 2012, IGC filed suit against j2 Global and one of its affiliates in the United States District Court for the Northern District of California (“Northern District of California”), alleging that j2 Global - through filing suit in the Central District of California - breached a contract not to sue IGC. IGC seeks monetary damages, attorneys' fees, costs, injunctive relief and specific performance of the alleged covenant not to sue IGC. On August 24, 2012, j2 Global filed a motion to dismiss or alternatively to transfer the case to the Central District of California. The motion was heard on October 26, 2012; the Court denied the motion on March 29, 2013. On April 12, 2013, j2 Global filed its answer and asserted counterclaims for infringement of the ‘638, ‘066, ‘688, and ‘132 Patents. On May 3, 2013, IGC asserted counterclaims seeking declaratory judgments of invalidity, unenforceability and non-infringement of the ‘638, ‘066, ‘688, and ‘132 Patents, implied license and exhaustion, punitive damages, attorneys’ fees and costs. On June 28, 2013, the Court granted in part and denied in part j2 Global’s motion to dismiss certain of IGC’s counterclaims, dismissing the claims for declaratory judgment of exhaustion and punitive damages. Discovery is underway, and the Court has set a trial date of April 21, 2014 on the issue of interpretation of the contract that IGC alleges j2 Global breached. On January 31, 2014, j2 moved for summary judgment on IGC’s breach of contract claim. That motion remains pending.
	On June 27, 2013, j2 Global filed suit against IGC in the Northern District of California, alleging infringement of the ‘980 Patent. On August 29, 2013, IGC filed counterclaims for declarations of invalidity, unenforceability, and non-infringement of the ‘980 Patent; an implied license to the ‘980 Patent; and breach and specific enforcement of an alleged covenant not to sue IGC. On September 26, 2013, j2 moved to dismiss IGC’s counterclaims for unenforceability and an implied license of the ‘980 Patent and for breach and specific performance of the contract not to sue. That motion remains pending. On October 18, 2013, the Court consolidated IGC’s breach of contract counterclaim with the other case pending in the Northern District of California and stayed j2 Global's patent infringement claims pending resolution of the breach of contract claims.
	On February 17, 2011, Emmanuel Pantelakis (“Pantelakis”) filed suit against j2 Global Canada, Inc., carrying on business as Protus IP Solutions (“j2 Canada”), in the Ontario Superior Court of Justice, alleging that Protus breached a contract with Pantelakis in connection with Protus’s e-mail marketing services. Pantelakis is seeking damages, attorneys’ fees, interest, and costs. j2 Canada filed a responsive pleading on March 23, 2011. On July 16, 2012, j2 Canada filed its responses to undertakings. On July 24, 2012, Pantelakis moved for an order granting him leave to file a second amended statement of claim re-framing his lawsuit as a negligence action. On September 27, 2012, the Court granted in part Pantelakis’s motion, permitting him to plead claims for negligence and breach of contract, but limited the scope of discovery, awarded j2 Canada its costs associated with its amended statement of defence and reserved a further award of costs for the trial court. On November 6, 2012, Pantelakis filed his second amended statement of claim. j2 Canada filed its amended statement of defence on April 8, 2013. A pre-trial was held on October 23, 2013, at which time the Court allowed additional discovery and set a new time table. Following the pre-trial, Pantelakis expressed a desire to bring a motion seeking to remove Ontario counsel for j2 Canada due to an alleged conflict of interest. The Court has ordered a timeline for the motion which will be argued on June 24, 2014. The proceedings are suspended pending determination of this motion.
	On January 18, 2013, Paldo Sign and Display Company (“Paldo”), filed an amended complaint adding j2 Global, j2 Canada, and a former j2 Canada employee, Tyler Eyamie (“Eyamie”), as additional defendants in an existing purported class action pending in the United States District Court for the Northern District of Illinois. The amended complaint alleged violations of the Telephone Consumer Protection Act (“TCPA”), the Illinois Consumer Fraud and Deceptive Business Practices Act (“ICFA”), and common law conversion, arising from a customer’s alleged use of the j2 Canada system to send unsolicited facsimile transmissions. On August 23, 2013, Paldo filed a second amended complaint to add a second plaintiff, Sabon, Inc. (“Sabon”). j2 Global and j2 Canada filed a motion to dismiss the ICFA and conversion claims, which was granted. Paldo and Sabon seek statutory damages, costs, attorneys’ fees and injunctive relief for the remaining TCPA claims. Eyamie has filed a motion to dismiss for lack of personal jurisdiction, which motion is pending. Discovery will not commence until the Eyamie motion is resolved.
	On February 19, 2013, Asher & Simons, P.A. (“Simons”) and Dr. Stuart T. Zaller, LLC (“Zaller”) filed suit against j2 Global and j2 Canada in the Circuit Court for Baltimore County, Maryland, alleging violations of the TCPA. On April 10, 2014, Simons and Zaller filed an amended complaint, adding a cause of action for violation of the Maryland Consumer Protection Act. Simons and Zaller seek statutory damages, costs, attorney’s fees and injunctive relief. j2 Canada removed the case to the United States District Court for the District of Maryland and j2 Global was dismissed from the lawsuit for lack of personal jurisdiction. In February 2014 this action was dismissed pursuant to a settlement agreement.
	On December 16, 2013, Anthony Jenkins (“Jenkins”) filed a purported class action against j2 Global, carrying on business as eFax, in the Central District of California. The complaint includes causes of action for breach of contract, state statutory violations, unjust enrichment and conversion. As the potential class representative, Jenkins is seeking damages, statutory damages, restitution, attorneys’ fees, interest, costs and injunctive relief on behalf of himself and a purported nationwide class of persons allegedly similarly situated. j2 Global has yet to file a responsive pleading to the complaint.
	j2 Global does not believe, based on current knowledge, that the foregoing legal proceedings or claims, including those where an unfavorable outcome is reasonably possible, after giving effect to existing reserves, are likely to have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. However, depending on the amount and the timing, an unfavorable resolution of some or all of these matters could materially affect j2 Global’s consolidated financial position, results of operations or cash flows in a particular period. The Company has not accrued for a loss contingency relating to these legal proceedings because unfavorable outcomes are not considered by management to be probable or the amount of any losses reasonably estimable.
	Credit Agreement
	On January 5, 2009, the Company entered into a Credit Agreement with Union Bank, N.A. in order to further enhance its liquidity in the event of potential acquisitions or other corporate purposes (the "Credit Agreement"). The Credit Agreement was amended on August 16, 2010, July 13, 2012, November 9, 2012 and November 19, 2013. The July 13, 2012 amendment was entered into in connection with the issuance of senior unsecured notes as discussed in Note 8 - Long-Term Debt - and extended the Revolving Credit Commitment Termination Date (as defined in the Credit Agreement) to November 14, 2013. The November 9, 2012 amendment was entered into in connection with the acquisition of Ziff Davis, Inc. as discussed in Note 3 - Business Acquisitions. The November 19, 2013 amendment extended the revolving credit commitment termination date to November 14, 2016 and amended certain definitions and covenants. The Credit Agreement provides for a $40.0 million revolving line of credit with a $10.0 million letter of credit sublimit. The facility is unsecured (except to the limited extent described below) and has never been drawn upon. Revolving loans may be borrowed, repaid and re-borrowed until November 14, 2016, on which date all outstanding principal of, together with accrued interest on, any revolving loans will be due. j2 Global may prepay the loans and terminate the commitments at any time, with generally no premium or penalty.
	Loans will bear interest at the election of j2 Global at either:
	•LIBOR plus a margin depending on the current Leverage Ratio (as defined in the Credit Agreement) equal to a range of 1.5% to 2% for interest periods of 1, 2, 3 or 6 months (the “Fixed Interest Rate”); or
	•	the “Base Rate”, defined as the highest of (i) the reference rate in effect as determined per the Credit Agreement, (ii) the federal funds rate in effect as determined per the Credit Agreement plus a margin equal to 0.5%, and (iii) the 1 month LIBOR rate plus 1.50% plus a margin depending on the current Leverage Ratio (as defined in the Credit Agreement) equal to a range of 0.5% to 1%.
	The Company is also obligated to pay closing fees, letter of credit fees and commitment fees customary for a credit facility of this size and type.
	Interest on the loan is payable quarterly or, if accruing at a Fixed Interest Rate, on the last day of the applicable interest rate period, or for interest rate periods longer than 3 months, at the end of each 3-month period in the applicable interest rate period.
	Pursuant to the Credit Agreement, as amended, significant subsidiaries organized under the laws of any state in the U.S., excluding Ziff Davis and subsidiaries, are required to guaranty j2 Global's obligations under the Credit Agreement. “Significant Domestic Subsidiary” is defined as a domestic subsidiary (excluding any "Unrestricted Subsidiary" as defined in the Senior Notes Indenture) that has total assets in excess of 4% of the total consolidated assets of j2 Global and its "Restricted Subsidiaries" (as defined in the Senior Notes Indenture) as of the end of the most recent fiscal quarter or had EBITDA (on a stand-alone basis)(as defined in the Credit Agreement) that exceeds 4% of j2 Global and its "Restricted Subsidiaries" for four fiscal quarters then most recently ended; provided that no such domestic subsidiary (excluding any "Unrestricted Subsidiary" and any Subsidiaries of any such Unrestricted Subsidiary) shall fail to be designated as a significant domestic subsidiary if such subsidiary, together will all other such domestic subsidiaries (excluding any "Unrestricted Subsidiary" as defined in the Senior Notes Indenture and any Subsidiaries of any such Unrestricted Subsidiary) that are otherwise not deemed to be significant domestic subsidiaries would represent, in the aggregate (1) 8% or more of the total consolidated assets of j2 Global and its "Restricted Subsidiaries" at the end of the most recently ended fiscal year or (2) 8% or more of EBITDA of j2 Global and its Restricted Subsidiaries for the most recently ended four quarter period. "Significant Foreign Subsidiary" is defined as a subsidiary that either (1) had net income for the fiscal quarter then most recently ended in excess of 10% of EBITDA for such fiscal quarter or (2) had assets in excess of 10% of the total assets of j2 Global and its subsidiaries on a consolidated basis as at the end of the fiscal quarter then most recently ended. Also pursuant to the Credit Agreement, the Company entered into a Security Pledge Agreement whereby j2 Global granted to Lender a security interest in 65% of the issued stock of j2 Global Holdings Limited, a wholly owned Irish subsidiary of j2 Global. j2 Global will also be required to grant a security interest to Lender in 65% of the issued stock of any future non-U.S. based significant subsidiary.
	The Credit Agreement contains customary affirmative and negative covenants, including covenants that limit or restrict j2 Global's ability to, among other things, grant liens, dispose of assets, incur indebtedness, guaranty obligations, merge or consolidate, acquire another company, make loans or investments or repurchase stock, in each case subject to exceptions customary for a credit facility of this size and type.
	The Credit Agreement also contains financial covenants that establish minimum EBITDA and Leverage Ratio.
	The Credit Agreement includes customary events of default that include, among other things, payment defaults, inaccuracy of representations and warranties, covenant defaults, material bankruptcy and insolvency events, judgments and failure to comply with judgments, tax defaults, change of control and cross defaults, in each case subject to exceptions and/or thresholds customary for a credit facility of this size and type. The occurrence of an event of default could result in the acceleration of j2 Global's repayment obligations under the Credit Agreement.
	Leases
	j2 Global leases certain facilities and equipment under non-cancelable operating leases which expire at various dates through 2020. Future minimum lease payments at December 31, 2013 under non-cancelable operating leases (with initial or remaining lease terms in excess of one year) are as follows (in thousands):
		Operating
		Leases
	Fiscal Year:
	2014	$	6,674
	2015	6,167
	2016	5,692
	2017	3,838
	2018	3,344
	Thereafter	2,550
	Total minimum lease payments	$	28,265
	Rental expense for the years ended December 31, 2013, 2012 and 2011 was $7.7 million, $3.2 million and $2.9 million, respectively.
	Non-Income Related Taxes
	As a provider of cloud services for business, the Company does not provide telecommunications services. Thus, it believes that its business and its users (by using our services) are not subject to various telecommunication taxes. Moreover, the Company does not believe that its business and its users (by using our services) are subject to other indirect taxes, such as sales and use tax, value added tax (“VAT”), goods and services tax, business tax and gross receipt tax. However, several state and municipal taxing authorities have challenged these beliefs and have and may continue to audit and assess our business and operations with respect to telecommunications and other indirect taxes.
	The current U.S. federal government moratorium on states and other local authorities imposing access or discriminatory taxes on the Internet, which is set to expire November 2014, does not prohibit federal, state or local authorities from collecting taxes on our income or from collecting taxes that are due under existing tax rules.
	The Company is currently under audit for indirect taxes in several states and municipalities. The Company currently has no reserves established for these matters, as the Company has determined that the liability is not probable and estimable. However, it is reasonably possible that such a liability could be incurred, which would result in additional expense, which could materially impact our financial results.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The provision for income tax consisted of the following (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Current:
	Federal	$	22,834			$	20,759			$	3,673
	State	2,676				(289		)		412
	Foreign	9,415				11,639				11,443
	Total current	34,925				32,109				15,528
	Deferred:
	Federal	3,678				2,427				6,761
	State	(235		)		314				2,012
	Foreign	(3,193		)		(1,591		)		(1,951		)
	Total deferred	250				1,150				6,822
	Total provision	$	35,175			$	33,259			$	22,350
	A reconciliation of the statutory federal income tax rate with j2 Global's effective income tax rate is as follows:
		Years Ended December 31,
		2013		2012			2011
	Statutory tax rate	35	%		35	%		35	%
	State income taxes, net	0.3			0.5			0.9
	Foreign rate differential	(17.9	)		(17.4	)		(16	)
	Reserve for uncertain tax positions	4.3			4.9			(5.7	)
	Valuation Allowance	1.9			3.2			(0.1	)
	IRC Section 199 deductions	(0.5	)		(3.4	)		—
	Other	1.6			(1.3	)		2.2
	Effective tax rates	24.7	%		21.5	%		16.3	%
	The Company's effective rate for each year is normally lower than the 35% U.S. federal statutory plus applicable state income tax rates primarily due to earnings of j2 Global's subsidiaries outside of the U.S. in jurisdictions where the effective tax rate is lower than in the U.S.
	Deferred tax assets and liabilities result from differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. Temporary differences and carryforwards which give rise to deferred tax assets and liabilities are as follows (in thousands):
		Years Ended December 31,
		2013			2012
	Deferred tax assets:
	Net operating loss carryforwards	9,596			2,890
	Tax credit carryforwards	9,233			7,600
	Accrued expenses	1,196			821
	Allowance for bad debt	1,423			1,028
	Share-based compensation expense	4,917			5,990
	Basis difference in fixed assets	1,266			—
	Impairment of investments	161			355
	Gain on sale of intangible assets	123			137
	Deferred revenue	812			270
	State taxes	1,451			1,534
		30,178			20,625
	Less:  Valuation Allowance	(8,493	)		(5,918	)
	Total deferred tax assets	21,685			14,707
	Deferred tax liabilities:
	Basis difference in fixed assets	—			(84	)
	Basis difference in intangible assets	(47,711	)		(38,864	)
	Prepaid insurance	(369	)		(224	)
	Other	(6,359	)		(5,018	)
	Total deferred tax liabilities	(54,439	)		(44,190	)
	Net deferred tax assets	(32,754	)		(29,483	)
	The Company had approximately $21.7 million and $14.7 million in deferred tax assets as of December 31, 2013 and 2012, respectively, related primarily to tax credit carryforwards, net operating loss carryforwards and differences in share-based compensation between its financial statements and its tax returns. Based on the weight of available evidence, the Company assesses whether it is more likely than not that some portion or all of a deferred tax asset will not be realized. If necessary, j2 Global records a valuation allowance sufficient to reduce the deferred tax asset to the amount that is more likely that not to be realized. The deferred tax assets should be realized through future operating results and the reversal of temporary differences.
	As of December 31, 2013, the Company had federal and state (California) net operating loss carryforwards (“NOLs”) of $22.9 million and $0.7 million, respectively, after considering substantial restrictions on the utilization of these NOLs due to “ownership changes” as defined in the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). j2 Global current estimates that all of the above-mentioned federal and a portion of the state NOLs will be available for use before their expiration. However, the Company expects a substantial portion of the state NOL to not be utilizable and thus recorded a valuation allowance against it as of December 31, 2013. These NOLs expire through the year 2028 for the federal and 2030 for the state. In addition, as of December 31, 2013 and 2012, the Company had state research and development tax credits of $0.9 million and $0.4 million, respectively, which last indefinitely. In addition, as of December 31, 2013, the Company had state enterprise zone tax credits of $0.5 million, which last indefinitely.
	Certain tax payments are prepaid during the year and included within prepaid expenses and other current assets on the consolidated balance sheet. The Company's prepaid tax payments were $11.3 million and $9.0 million at December 31, 2013 and 2012, respectively.
	Uncertain Income Tax Positions
	j2 Global accrues liabilities for uncertain income tax positions in accordance with the requirements of ASC 740. During 2013, j2 Global recognized a net increase of $7.1 million in liabilities related to positions taken during 2013. The Company also had a net decrease of $(1.6) million related to the reversal of positions taken in prior years. Accordingly, the Company had $43.9 million in liabilities for uncertain income tax positions at December 31, 2013. Included in this liability amount were $3.0 million accrued for related interest, net of federal income tax benefits and penalties recorded in income tax expense on j2 Global's consolidated statement of income.
	A reconciliation of the Company's unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):
	Balance at January 1, 2013	$	35,421
	Decreases related to positions taken during a prior period	(1,646		)
	Increases related to positions taken in the current period	7,113
	Balance at December 31, 2013	$	40,888
	Uncertain income tax positions are reasonably possible to significantly change during the next 12 months as a result of completion of income tax audits and expiration of statutes of limitations. At this point it is not possible to provide an estimate of the amount, if any, of significant changes in reserves for uncertain income tax positions as a result of the completion of income tax audits that are reasonably possible to occur in the next 12 months. In addition, the Company cannot currently estimate the amount of, if any, uncertain income tax positions which will be released in the next 12 months as a result of expiration of statutes of limitations due to ongoing audits. As a result of ongoing federal, state and foreign income tax audits (discussed below), it is reasonably possible that our entire reserve for uncertain income tax positions for the periods under audit will be released. It is also reasonably possible that the Company's reserves will be inadequate to cover the entire amount of any such income tax liability.
	The Company has not provided U.S. income taxes and foreign withholding taxes on the undistributed earnings of foreign subsidiaries as of December 31, 2013 because it intends to permanently reinvest such earnings outside the U.S. If these foreign earnings were to be repatriated in the future, the related U.S. tax liability may be reduced by any foreign income taxes previously paid on these earnings and would generate foreign tax credits that would reduce the federal tax liability. As of December 31, 2013, the cumulative amount of earnings upon which U.S. income taxes have not been provided is approximately $389.5 million. Determination of the amount of unrecognized deferred tax liability related to these earnings is not practicable. Income before income taxes included income from domestic operations of $61.0 million, $54.2 million and $60.5 million for the year ended December 31, 2013, 2012 and 2011, respectively, and income from foreign operations of $81.7 million, $100.7 million and $76.6 million for the year ended December 31, 2013, 2012 and 2011, respectively.
During 2013, 2012 and 2011, the Company recorded tax benefits of $7.1 million, $3.3 million and $15.8 million from the exercise of non-qualifying stock options, restricted stock and disqualifying dispositions of incentive stock options as a reduction of j2 Global's income tax liability and an increase in equity, respectively.
Income Tax Audits:
j2 Global is currently under audit by the California Franchise Tax Board ("FTB") for tax years 2005 through 2007 and during the second quarter of 2013 were notified that the FTB will be auditing it for tax years 2009 through 2011. The FTB has also issued Information Document Requests regarding the 2004 and 2008 tax years, although no formal notice of audit for these years has been provided. During 2013, the Company was notified by the Illinois Department of Revenue that it will be audited for income tax for tax years 2008 and 2009. During 2013, the Company was notified by the New York City Department of Finance that it will be audited for income tax for tax years 2009 through 2011.
The Company is also under audit by the U.S. Internal Revenue Service ("IRS") for tax years 2009 and 2010 and during the second quarter of 2013 received notice that the IRS will be auditing it for tax year 2011. The Company has appealed the IRS tax examiner's decision regarding transfer pricing for tax years 2009 and 2010 with the IRS appeals office and the process remains on-going.
In addition, the Company is under income tax audit by the Canada Revenue Agency ("CRA") for tax years 2010 through 2011. During 2013, we were notified by the CRA that the income tax audit for tax years 2008 and 2009 has concluded with no changes and that tax year 2011 would be subject to an income tax audit. The Company is also under audit by the CRA for Goods and Services Tax for tax period beginning on October 1, 2008 and ending on September 30, 2012.
It is reasonably possible that these audits may conclude in the next 12 months and that the uncertain tax positions the Company has recorded in relation to these tax years may change compared to the liabilities recorded for these periods. If the recorded uncertain tax positions are inadequate to cover the associated tax liabilities, the Company would be required to record additional tax expense in the relevant period, which could be material. If the recorded uncertain tax positions are adequate to cover the associated tax liabilities, the Company would be required to record any excess as reduction in tax expense in the relevant period, which could be material However, it is not currently possible to estimate the amount, if any, of such change.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	j2 Preferred Stock
	In connection with the December 31, 2013 reorganization of Ziff Davis, Inc. ("ZD Inc.") into Ziff Davis, LLC ("ZD LLC") and the Company's acquisition of all of the minority holders' equity interests in ZD Inc., the Company issued j2 Series A Preferred Stock ("j2 Series A Stock") and j2 Series B Preferred Stock ("j2 Series B Stock").
	j2 Series A Stock
	Each share of j2 Series A Stock has a stated value of $1,000 and the aggregate stated value of all shares of Series A Stock is $5,064,000. The j2 Series A Stock is not convertible into any other securities. In the event ZD LLC pays any dividends or distributions to the Company in respect of the Company’s membership interests in ZD LLC (subject to certain exceptions in respect of senior interests), holders of the j2 Series A Stock will be entitled to receive a dividend in the aggregate with respect to all j2 Series A Stock equal to 2.4449% of such ZD LLC dividend (but only to the extent such dividend and all other dividends paid in respect of the series A preferred stock does not exceed a compounded annual rate of 15% on the stated value of the j2 Series A Stock).
	The j2 Series A Stock has a liquidation preference over the j2 Series B Stock and a liquidation preference over j2 common stock in an amount up to, with respect to all shares of j2 Series A Stock, 2.4449% of the assets of ZD LLC and its subsidiaries legally available for distribution to the Company, after reduction in respect of certain senior interests (the "series A minority portion"), but in no event in an amount that exceeds the stated value of the j2 Series A Stock increased at a compounded annual rate of 15% (the "series A cap") and in no event in an amount that exceeds the lesser of the Company’s assets available for distribution and 2.4449% of the assets of ZD LLC and its subsidiaries legally available for distribution to the Company.
	On or after January 2, 2019, the j2 Series A Stock will be mandatorily redeemable by the Company upon the occurrence of certain contingent liquidity events such as a sale, initial public offering or spin-off transactions involving ZD, LLC. Any or all of the j2 Series A Stock is subject to redemption by the Company at its option at any time. If the redemption occurs in connection with certain sale, initial public offering or spin-off transactions involving ZD LLC, the redemption price will be equal to an allocable portion of the enterprise value of ZD, LLC implied by such transaction with respect to the series A minority portion and based on certain factors to be determined by the Company’s Board of Directors in its sole good faith judgment, but in no event in an amount that would exceed the series A cap. If not in connection with such a transaction, the redemption price will be the series A cap.
	j2 Series B Stock
	The j2 Series B Stock is not convertible into any other securities.  In the event ZD LLC pays any dividends or distributions to the Company in respect of the Company’s membership interests in ZD LLC (subject to certain exceptions in respect of senior interests and the j2 Series A Stock), holders of the j2 series B preferred stock will be entitled to receive a dividend in the aggregate with respect to all j2 Series B Stock equal to 9.5579% of such ZD LLC dividend.
	The j2 Series B Stock will have a liquidation preference junior to the liquidation preference of the j2 Series A Stock and a liquidation preference over the j2 common stock in an amount up to, with respect to all shares of j2 Series B Stock, 9.5579% of the assets of ZD LLC and its subsidiaries legally available for distribution to the Company, after reduction in respect of the j2 Series A Stock and certain other senior interests (the "series B minority portion"), but in no event in an amount that exceeds the lesser of the Company’s assets available for distribution and 9.5579% of the assets of ZD LLC and its subsidiaries legally available for distribution to the Company.
	On or after January 2, 2019, the j2 Series B Stock will be mandatorily redeemable by the Company upon the occurrence of certain contingent liquidity events such as a sale, initial public offering or spin-off transactions involving ZD LLC. Any or all of the j2 Series B Stock is subject to redemption by the Company at its option at any time. If the redemption occurs in connection with certain sale, initial public offering or spin-off transactions involving ZD LLC, the redemption price will be equal to an allocable portion of the enterprise value of ZD LLC implied by such transaction with respect to the series B minority portion and based on certain factors to be determined by the Board of Directors of the Company in its sole good faith judgment. Otherwise, the redemption price will be equal to the fair market value of such share as determined by the Company’s Board of Directors in its sole good faith judgment.
	The terms of the j2 Series A Stock and j2 Series B Stock are more fully described in the Certificates of Designation establishing the terms of such securities which are included as Exhibits 3.1 and 3.2 to the Current Report on Form 8-K filed by the Company on January 3, 2014.
	Non-Controlling Interest
	Non-controlling interests represents equity interests in consolidated subsidiaries that are not attributable, either directly or indirectly, to j2 Global (i.e., minority interests). Non-controlling interests includes the minority equity holders' proportionate share of the equity of Ziff Davis, Inc.
	Ownership interests in subsidiaries held by parties other than the Company are presented as non-controlling interests within stockholders' equity, separately from the equity held by the Company on the consolidated statements of stockholders' equity. Revenues, expenses, net income and other comprehensive income are reported in the consolidated financial statements at the consolidated amounts, which includes amounts attributable to both the Company's interest and the non-controlling interests in Ziff Davis. Net income and other comprehensive income is then attributed to the Company's interest and the non-controlling interests. Net income to non-controlling interests is deducted from net income in the consolidated statements of income to determine net income attributable to the Company's common shareholders.
	In connection with the December 31, 2013 reorganization of ZD, Inc. into ZD, LLC, the Company acquired all of the minority holders' equity interests in ZD, Inc. As a result, on December 31, 2013, ZD LLC became a wholly-owned subsidiary of j2 Global, Inc. and the non-controlling interest was no longer outstanding.
	Common Stock Repurchase Program
	In February 2012, the Company’s Board of Directors approved a program authorizing the repurchase of up to five million shares of j2 Global common stock through February 20, 2013 (See Note 22 - Subsequent Events - for a discussion regarding the extension of the share repurchase program through February 20, 2015). On February 15, 2012, the Company entered into a Rule 10b5-1 trading plan with a broker to facilitate the repurchase program. At December 31, 2013, 2.1 million shares were repurchased at an aggregate cost of $58.6 million (including an immaterial amount of commission fees).
	Periodically, participants in j2 Global’s stock plans surrender to the Company shares of j2 Global stock to pay the exercise price or to satisfy tax withholding obligations arising upon the exercise of stock options or the vesting of restricted stock. During the year ended December 31, 2013, the Company purchased 105,828 shares from plan participants for this purpose.
	Dividends
	The following is a summary of each dividend declared during fiscal year 2013:
	Declaration Date	Dividend per Common Share		Record Date	Payment Date
	February 12, 2013	$	0.2325	February 25, 2013	March 4, 2013
	May 7, 2013	$	0.24	May 20, 2013	June 4, 2013
	August 7, 2013	$	0.2475	August 19, 2013	September 3, 2013
	November 5, 2013	$	0.255	November 18, 2013	December 4, 2013
	On February 11, 2014, the Company's Board of Directors approved a quarterly cash dividend of $0.2625 per share of common stock payable on March 10, 2014 to all stockholders of record as of the close of business on February 24, 2014 (See Note 21 - Subsequent Events). Future dividends will be subject to Board approval.
	Treasury Stock
	On August 14, 2012, the Company retired all treasury stock (which resulted from prior stock repurchases) on its balance sheet. Accordingly, such treasury stock is zero as of December 31, 2013 and 2012.

Stock_Options_And_Employee_Sto

Stock Options And Employee Stock Purchase Plan	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Options And Employee Stock Purchase Plan	'
	Stock Options and Employee Stock Purchase Plan
	j2 Global’s share-based compensation plans include the Second Amended and Restated 1997 Stock Option Plan, 2007 Stock Plan and 2001 Employee Stock Purchase Plan (each is described below).
	(a)	Second Amended and Restated 1997 Stock Option Plan and 2007 Stock Plan
	In November 1997, j2 Global's Board of Directors adopted the j2 Global Communications, Inc. 1997 Stock Option Plan, which was twice amended and restated (the “1997 Plan”). The 1997 Plan terminated in 2007, although stock options and restricted stock issued under the 1997 Plan continue to be governed by it. A total of 12,000,000 shares of common stock were authorized to be used for 1997 Plan purposes. An additional 840,000 shares were authorized for issuance upon exercise of options granted outside the 1997 Plan.
	In October 2007, j2 Global's Board of Directors adopted the j2 Global, Inc. 2007 Stock Plan (the “2007 Plan”). The 2007 Plan provides for the granting of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units and other share-based awards. The number of authorized shares of common stock that may be used for 2007 Plan purposes is 4,500,000. Options under the 2007 Plan may be granted at exercise prices determined by the Board of Directors, provided that the exercise prices shall not be less than the fair market value of j2 Global's common stock on the date of grant for incentive stock options and not less than 85% of the fair market value of j2 Global's common stock on the date of grant for non-statutory stock options.
	At December 31, 2013, 2012 and 2011, options to purchase 845,198, 1,132,365 and 1,155,335 shares of common stock were exercisable under and outside of the 2007 Plan and the 1997 Plan combined, at weighted average exercise prices of $20.35, $21.94 and $19.80, respectively. Stock options generally expire after 10 years and vest over a 5-year period.
	All stock option grants are approved by “outside directors” within the meaning of Internal Revenue Code Section 162(m).
	Stock Options
	Stock option activity for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:
		Number of Shares		Weighted-Average				Weighted-Average Remaining Contractual Life (In Years)
				Exercise Price
										Aggregate
										Intrinsic
										Value
	Options outstanding at December 31, 2010	3,794,394		$	14.4
	Granted	163,319		$	29.42
	Exercised	(1,820,678	)	$	7.92
	Canceled	(49,340	)	$	24.76
	Options outstanding at December 31, 2011	2,087,695		$	20.99
	Granted	67,000		$	27.26
	Exercised	(357,234	)	$	15.81
	Canceled	(32,000	)	$	31.34
	Options outstanding at December 31, 2012	1,765,461		$	22.08
	Granted	—		$	—
	Exercised	(569,204	)	$	23.9
	Canceled	(20,600	)	$	21.79
	Options outstanding at December 31, 2013	1,175,657		$	21.21			4		$33,858,816
	Exercisable at December 31, 2013	845,198		$	20.35			3.1		$25,068,917
	Vested and expected to vest at December 31, 2013	1,132,886		$	21.01			3.9		$32,856,049
	The Company did not grant any options to purchase shares of common stock during the year ended December 31, 2013.
	The per share weighted-average grant-date fair values of options granted during the years 2012 and 2011 were $7.92 and $12.54, respectively.
	The total intrinsic values of options exercised during the years ended December 31, 2013, 2012 and 2011 were $11.9 million, $4.5 million and $41.4 million, respectively. The total fair value of options vested during the years ended December 31, 2013, 2012 and 2011 was $3.1 million, $4.7 million and $4.6 million, respectively.
	Cash received from options exercised under all share-based payment arrangements for the years ended December 31, 2013, 2012 and 2011 was $13.6 million, $5.6 million and $7.1 million, respectively. The actual tax benefit realized for the tax deductions from option exercises under the share-based payment arrangements totaled $3.9 million, $1.6 million and $14.2 million, respectively, for the years ended December 31, 2013, 2012 and 2011.
	At December 31, 2013, the exercise prices of options granted under and outside the 2007 Plan and the 1997 Plan ranged from $9.55 to $34.73, with a weighted-average remaining contractual life of 4.03 years.
	The following table summarizes information concerning outstanding and exercisable options as of December 31, 2013:
			Options Outstanding								Exercisable Options
	Range of		Number Outstanding December 31, 2013		Weighted		Weighted				Number	Weighted
	Exercise Prices				Average		Average				Exercisable	Average
					Remaining		Exercise				December 31,	Exercise
					Contractual		Price				2013	Price
					Life
	$9.55		200,000		0.23 years		$	9.55			200,000	$	9.55
	13.74 - 15.65		7,911		0.93 years		15.57				7,911	15.57
	17.19		150,420		5.18 years		17.19				43,280	17.19
	18.77		172,925		1.67 years		18.77				172,925	18.77
	20.15 - 21.67		157,504		4.86 years		21.21				130,152	21.15
	21.88 - 23.11		119,228		6.13 years		22.85				65,244	22.78
	23.40 - 29.34		203,169		6.52 years		28.25				94,686	28.32
	29.53 - 31.07		47,500		8.00 years		30.26				14,000	30.52
	32.45		102,000		3.59 years		32.45				102,000	32.45
	34.73		15,000		3.56 years		34.73				15,000	34.73
	$9.55 - $34.73		1,175,657		4.03 years		$	21.21			845,198	$	20.35
	At December 31, 2013, there were 887,343 additional shares underlying options, shares of restricted stock and other share-based awards available for grant under the 2007 Plan, and no additional shares available for grant under or outside of the 1997 Plan.
	As of December 31, 2013, there was $2.0 million of total unrecognized compensation expense related to nonvested share-based compensation awards granted under the 2007 Plan and the 1997 Plan. That expense is expected to be recognized ratably over a weighted average period of 1.44 years (i.e., the remaining requisite service period).
	Fair Value Disclosure
	j2 Global uses the Black-Scholes option pricing model to calculate the fair value of each option grant. The expected volatility is based on historical volatility of the Company’s common stock. Beginning in the first quarter 2012, the Company estimates the expected term based upon the historical exercise behavior of our employees. Previously, the Company elected to use the simplified method for estimating the expected term. Under the simplified method, the expected term is equal to the midpoint between the vesting period and the contractual term of the stock option. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a term equal to the expected term of the option assumed at the date of grant. Prior to the initial declaration of a cash dividend on August 1, 2011, the fair value of stock options, restricted stock and restricted stock units were measured based upon an expected dividend yield of 0.0%, as the Company did not historically pay cash dividends on its common stock. For awards granted on or subsequent to August 1, 2011, the Company uses an annualized dividend yield based upon the per share dividends declared by its Board of Directors. Estimated forfeiture rates were 14.4%, 14.6% and 14.9% as of December 31, 2013, 2012 and 2011, respectively.
	The weighted-average fair values of stock options granted have been estimated utilizing the following assumptions:
		Year Ended December 31,
			2012	2011
	Risk-free interest rate		1.10%	2.30%
	Expected term (in years)		5.7	6.5
	Dividend yield		3.20%	2.60%
	Expected volatility		41.60%	41.80%
Share-Based Compensation Expense
The following table represents share-based compensation expense included in cost of revenues and operating expenses in the consolidated statements of income for the years ended December 31, 2013, 2012 and 2011 (in thousands):
	Year Ended December 31,
	2013			2012				2011
Cost of revenues	$	756		$	844			$	982
Operating expenses:
Sales and marketing	1,855			1,543				1,431
Research, development and engineering	434			459				477
General and administrative	6,675			6,286				6,103
	$	9,720		$	9,132			$	8,993
Restricted Stock
j2 Global has awarded restricted stock and restricted stock units to its Board of Directors and senior staff pursuant to the 1997 Plan and the 2007 Plan. Compensation expense resulting from restricted stock and restricted unit grants is measured at fair value on the date of grant and is recognized as share-based compensation expense over the applicable vesting period. Beginning in fiscal year 2012 vesting periods are approximately one year for awards to members of the Company's Board of Directors and five years for senior staff. The Company granted 729,137, 390,210 and 130,212 shares of restricted stock and restricted units during the years ended December 31, 2013, 2012 and 2011, respectively, and recognized $7.1 million, $5.2 million and $3.9 million, respectively of related compensation expense. As of December 31, 2013, the Company had unrecognized share-based compensation cost of $20.2 million associated with these awards. This cost is expected to be recognized over a weighted-average period of 3.0 years for awards and 3.6 years for units. The total fair value of restricted stock and restricted stock units vested during the years ended December 31, 2013, 2012 and 2011 was $6.4 million, $4.3 million and $3.2 million, respectively. The actual tax benefit realized for the tax deductions from the vesting of restricted stock awards and units totaled $1.4 million, $0.3 million and $0.3 million, respectively, for the years ended December 31, 2013, 2012 and 2011. In accordance with ASC 718, share-based compensation is recognized on dividends paid related to nonvested restricted stock not expected to vest, which amounted to approximately $68,000 for the year ended December 31, 2013.
Restricted stock award activity for the year ended December 31, 2013 is set forth below:
	Shares		Weighted-Average
			Grant-Date
			Fair Value
Nonvested at January 1, 2013	828,475		$	23.08
Granted	690,762		13.57
Vested	(296,966	)	21.46
Canceled	(43,900	)	24.46
Nonvested at December 31, 2013	1,178,371		$	17.86
Restricted stock unit activity for the year ended December 31, 2013 is set forth below:
	Number of		Weighted-Average		Aggregate
	Shares		Remaining		Intrinsic
			Contractual		Value
			Life (in Years)
Outstanding at January 1, 2012	32,750
Granted	91,166
Vested	(1,700	)
Canceled	(6,750	)
Outstanding at December 31, 2012	115,466
Granted	38,375
Vested	(11,116	)
Canceled	(33,000	)
Outstanding at December 31, 2013	109,725		2.2		$	5,487,347
Vested and expected to vest at December 31, 2013	74,509		1.9		$	3,726,174
Ziff Davis, Inc. Equity Incentive Plan
In November 2012, Ziff Davis, Inc. ("ZD, Inc.") established the Ziff Davis, Inc. 2012 Equity Incentive Plan (the "Ziff Davis Plan"), providing incentives to selected directors, officers, employees and consultants. The Ziff Davis Plan provides for the granting of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units and other share-based awards. The number of authorized shares of common stock that may be used for the Ziff Davis Plan purposes is 15,000,000. In addition, certain stockholders have put rights under certain circumstances in which the stockholder may elect to cause ZD, Inc. to purchase any or all of the shares of common stock (to the extent vested pursuant to the terms of the Ziff Davis Plan) and preferred stock owned by such stockholder. ZD, Inc. also has the option to call under certain circumstances the common stock issued pursuant to the Ziff Davis Plan (to the extent vested pursuant to the terms of the Ziff Davis Plan) and shares of preferred stock. Management has determined that the circumstances in which the put right held by the stockholder is exercisable are within the control of the Company. Accordingly, management determined that liability classification is not required.
ZD, Inc. granted 13,035,000 shares of restricted stock during the year ended December 31, 2012 to its senior staff pursuant to the Ziff Davis Plan, which shares vest evenly over a 5 year period. Based upon the terms of the Ziff Davis Series A Stock discussed in Note 9 - Mandatorily Redeemable Financial Instrument, the Company determined at the relevant grant date that the fair value of the ZD, Inc. restricted stock was zero. Accordingly, no compensation expense was recorded for the ZD, Inc. restricted stock for the year ended December 31, 2012.
In connection with the December 31, 2013 reorganization of ZD, Inc. into Ziff Davis, LLC, the Company acquired all of the minority holders' equity interests in ZD, Inc. As a result, on December 31, 2013, Ziff Davis LLC became a wholly-owned subsidiary of j2 Global, Inc. No further securities are issuable under the Ziff Davis Plan.
Employee Stock Purchase Plan
In May of 2001, j2 Global established the j2 Global, Inc. 2001 Employee Stock Purchase Plan, as amended (the “Purchase Plan”), which provides for the issuance of a maximum of 2,000,000 shares of common stock. Under the Purchase Plan, eligible employees can have up to 15% of their earnings withheld, up to certain maximums, to be used to purchase shares of j2 Global’s common stock at certain plan-defined dates. The price of the common stock purchased under the Purchase Plan for the offering periods is equal to 95% of the fair market value of the common stock at the end of the offering period. During 2013, 2012 and 2011, 5,402, 5,797 and 5,235 shares, respectively were purchased under the Purchase Plan at price ranging from $52.23 to $30.23 per share. As of December 31, 2013, 1,640,199 shares were available under the Purchase Plan for future issuance.

Defined_Contribution_401k_Savi

Defined Contribution 401(k) Savings Plan	12 Months Ended
	Dec. 31, 2013
Defined Contribution 401(k) Savings Plan [Abstract]	'
Pension and Other Postretirement Benefits Disclosure [Text Block]	'
	Defined Contribution 401(k) Savings Plan
	j2 Global has two significant 401(k) Savings Plans covering the employees of j2 Global, Inc. and its consolidated subsidiary Ziff Davis, Inc. Eligible employees may contribute through payroll deductions. The Company may make annual contributions to the j2 Global 401(k) Savings Plan at the discretion of j2 Global's Board of Directors and employees within the Ziff Davis, Inc. 401(k) Savings Plan receive 50% of the first 4% of eligible compensation with a maximum of 2% of salary. For the years ended December 31, 2013 and 2012, the Company accrued $0.1 million and $0.1 million, respectively, for contributions to the 401(k) Savings Plans.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	The components of basic and diluted earnings per share are as follows (in thousands, except share and per share data):
		Year Ended December 31,
		2013			2012			2011
	Numerator for basic and diluted net income per common share:
	Net income attributable to j2 Global, Inc. common shareholders	$	107,522		$	121,580		$	114,766
	Net income available to participating securities (a)	(2,105		)	(2,075		)	(1,932		)
	Net income available to j2 Global, Inc. common shareholders	105,417			119,505			112,834
	Denominator:
	Weighted-average outstanding shares of common stock	45,548,767			45,459,712			45,799,615
	Dilutive effect of:
	Dilutive effect of equity incentive plans	591,252			321,946			585,233
	Common stock and common stock equivalents	46,140,019			45,781,658			46,384,848
	Net income per share:
	Basic	$	2.31		$	2.63		$	2.46
	Diluted	$	2.28		$	2.61		$	2.43
	(a)	Represents unvested share-based payment awards that contain certain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid).
	For the years ended December 31, 2013, 2012 and 2011, there were zero, 527,319 and 421,319 options outstanding, respectively, which were excluded from the computation of diluted earnings per share because the exercise prices were greater than the average market price of the common shares.

Geographic_Information

Geographic Information	12 Months Ended
	Dec. 31, 2013
Segments, Geographical Areas [Abstract]	'
Geographic Information	'
	Segment Information
	The Company's business segments are based on the organization structure used by management for making operating and investment decisions and for assessing performance. j2 Global's reportable business segments are: (i) Business Cloud Services; and (ii) Digital Media. Segment accounting policies are the same as described in Note 2 - Basis of Presentation and Summary of Significant Policies.
	Information on reportable segments and reconciliation to consolidated income from operations is as follows (in thousands):
		Years Ended December 31,
		2013			2012		2011
	Revenue by segment:
	Business Cloud Services	$	390,104		$	361,684	$	330,159
	Digital Media	131,146			9,712		—
	Elimination of inter-segment revenues	(449		)	—		—
	Total revenue	520,801			371,396		330,159
	Direct costs by segment(1):
	Business Cloud Services	191,169			174,324		165,833
	Digital Media	124,413			6,823		—
	Direct costs by segment(1):	315,582			181,147		165,833
	Business Cloud Services operating income	198,935			187,360		164,326
	Digital Media operating income	6,733			2,889		—
	Segment operating income	205,668			190,249		164,326
	Global operating costs(2)	30,245			28,087		28,376
	Income from operations	$	175,423		$	162,162	$	135,950
	(1) Direct costs for each segment include cost of revenue and other operating expenses that are directly attributable to the segment such as employee compensation expense, local sales and marketing expenses, engineering and operations, depreciation and amortization and other administrative expenses.
	(2) Global operating costs include general and administrative and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment.
		2013			2012
	Assets:
	Business Cloud Services	$	818,722		$	788,828
	Digital Media	333,286			204,244
	Total assets from reportable segments	1,152,008			993,072
	Corporate	1,781			2,098
	Total assets	$	1,153,789		$	995,170
		2013			2012		2011
	Capital expenditures:
	Business Cloud Services	10,979			4,240		6,320
	Digital Media	6,635			380		—
	Total from reportable segments	$	17,614		$	4,620	$	6,320
	Corporate	1,012			441		524
	Total capital expenditures	$	18,626		$	5,061	$	6,844
	Depreciation and amortization:
	Business Cloud Services	24,148			20,473		19,342
	Digital Media	14,963			1,167		—
	Total from reportable segments	$	39,111		$	21,640	$	19,342
	Corporate	677			512		415
	Total depreciation and amortization	$	39,788		$	22,152	$	19,757
	j2 Global maintains operations in the U.S., Canada, Ireland, Japan and other countries. Geographic information about the U.S. and all other countries for the reporting periods is presented below. Such information attributes revenues based on jurisdictions where revenues are reported (in thousands).
		Year Ended December 31,
		2013			2012		2011
	Revenues:
	United States	$	369,507		$	233,585	$	203,153
	Canada	73,130			79,656		83,066
	Ireland	41,398			41,248		42,652
	All other countries	36,766			16,907		1,288
	Total	$	520,801		$	371,396	$	330,159
		December 31,			December 31,
		2013			2012
	Long-lived assets:
	United States	$	170,247		$	105,549
	All other countries	51,675			46,554
	Total	$	221,922		$	152,103
	Revenues for the year ended December 31, 2011 reflect a first quarter 2011 change in estimate of the remaining service obligation to eFax® annual subscribers in the amount of $10.3 million which reduced 2011 subscriber revenues predominately in the United States. See Note 2 – Basis of Presentation and Summary of Significant Accounting Policies - for further details.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure [Text Block]	'
	Related Party Transactions
	(a)	Lease and Expense Reimbursement
	Until the fourth quarter of 2011, the Company leased its headquarters office from a company that was affiliated with the Company's Chairman of the Board. That company sold its interest in our headquarters to a third-party during the fourth quarter 2011. For fiscal years 2013, 2012 and 2011, j2 Global paid zero, zero and $1.2 million, respectively, in rent to this company. j2 Global believes this lease was entered into at prevailing market rates, and that all expense reimbursements were based on actual amounts paid to third parties without markup or markdown.

Supplemental_Cash_Flows_Inform

Supplemental Cash Flows Information	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flows Information [Abstract]	'
Cash Flow, Supplemental Disclosures [Text Block]	'
	Supplemental Cash Flows Information
	Cash paid for interest during the years ended December 31, 2013, 2012 and 2011 was $21.1 million, $0.4 million and $0.1 million, respectively, substantially all of which related to interest on outstanding debt, foreign taxes and interest on settled acquisition holdback.
	Cash paid for income taxes net of refunds received was $28.3 million, $20.4 million and $13.5 million during the years ended December 31, 2013, 2012 and 2011, respectively.
	The Company acquired property and equipment for $0.9 million, $0.6 million and $0.8 million during the years ended December 31, 2013, 2012 and 2011, respectively, which had not been yet paid at the end of each such year.
	During the years ended December 31, 2013, 2012 and 2011, j2 Global recorded the tax benefit from the exercise of stock options and restricted stock as a reduction of its income tax liability of $7.1 million, $3.3 million and $15.8 million, respectively.
	Included in the purchase prices of the acquisitions closed during the years ended December 31, 2013, 2012 and 2011 were contingent holdbacks of $7.0 million, $2.5 million and $1.0 million, respectively. These are recorded as current accrued expenses or other long-term liabilities with a maturity equal to the expected holdback release date.
	In connection with the December 31, 2013 reorganization of Ziff Davis, Inc. into Ziff Davis, LLC, the Company acquired, in a non-cash transaction, all of the minority holders' equity interests in ZD, Inc., which included shares of Ziff Davis, Inc. Series A Preferred Stock and Ziff Davis, Inc. common stock. In this transaction, the Company issued the minority holders an aggregate fair market value of j2 common stock, j2 Series A Preferred Stock and j2 Series B Preferred Stock equal to the fair market value of the minority holders' shares in ZD, Inc. (see Note 12 - Stockholders' Equity). As a result of this reorganization, on December 31, 2013, the Ziff Davis Series A Preferred Stock and Ziff Davis common stock was extinguished, resulting in loss on extinguishment of debt and related interest expense of $14.4 million within the consolidated statement of income, in accordance with ASC 480, Distinguishing Liabilities from Equity.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Notes)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income [Abstract]	'
Comprehensive Income (Loss) Note [Text Block]	'
	Accumulated Other Comprehensive Income
	The following table summarizes the changes in accumulated balances of other comprehensive income, net of tax, for the year ended December 31, 2013 (in thousands):
		Unrealized Gains (Losses) on Investments				Foreign Currency Translation			Total
	Beginning balance	$	1,811			$	(1,899	)	$	(88	)
	Other comprehensive income before reclassifications	4,236				(10		)	4,226
	Amounts reclassified from accumulated other comprehensive income	9				88			97
	Net current period other comprehensive income	4,245				78			4,323
	Ending balance	$	6,056			$	(1,821	)	$	4,235
	The following table provides details about reclassifications out of accumulated other comprehensive income for the year ended December 31, 2013 (in thousands):
	Details about Accumulated Other Comprehensive Income Components		Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Statement of Income
			Year Ended December 31, 2013
	Cumulative translation adjustment		$	116			Other expense (income), net
			116				Total, before income taxes
			(28		)		Income tax expense (benefit)
			88				Total, net of tax
	Unrealized gain (loss) on available-for-sale investments		14				Other expense (income), net
			14				Total, before income taxes
			(5		)		Income tax expense (benefit)
			9				Total, net of tax
	Total reclassifications for the period		$	97			Total, net of tax

Quarterly_Results

Quarterly Results	12 Months Ended
	Dec. 31, 2013
Quarterly Results [Abstract]	'
Quarterly Financial Information [Text Block]	'
	Quarterly Results (unaudited)
	The following tables contain selected unaudited statement of income information for each quarter of 2013 and 2012 (in thousands, except share and per share data). j2 Global believes that the following information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.
		Year Ended December 31, 2013
		Fourth		Third		Second		First
		Quarter		Quarter		Quarter		Quarter
	Revenues	$	138,035	$	127,788	$	141,361	$	113,617
	Gross profit		115,857		105,987		118,682		93,382
	Net income attributable to j2 Global, Inc. common shareholders		20,754		27,806		36,040		22,922
	Net income per common share:
	Basic	$	0.45	$	0.6	$	0.78	$	0.5
	Diluted	$	0.44	$	0.59	$	0.77	$	0.49
	Weighted average shares outstanding
	Basic		45,867,769		45,729,171		45,428,230		45,160,140
	Diluted		46,382,363		46,291,631		46,018,245		45,668,167
		Year Ended December 31, 2012
		Fourth		Third		Second		First
		Quarter		Quarter		Quarter		Quarter
	Revenues	$	102,033	$	93,246	$	89,465	$	86,652
	Gross profit		83,375		76,943		73,278		70,788
	Net income attributable to j2 Global, Inc. common shareholders		30,203		31,650		31,188		28,539
	Net income per common share:
	Basic	$	0.66	$	0.69	$	0.68	$	0.61
	Diluted	$	0.65	$	0.69	$	0.67	$	0.6
	Weighted average shares outstanding
	Basic		45,071,204		45,002,565		45,373,930		46,400,441
	Diluted		45,423,502		45,340,111		45,569,564		46,794,603

Unrestricted_Subsidiaries_Note

Unrestricted Subsidiaries (Notes)	12 Months Ended
	Dec. 31, 2013
Unrestricted Subsidiaries [Abstract]	'
Unrestricted Subsidiaries [Text Block]	'
	Unrestricted Subsidiaries (unaudited)
	As of December 31, 2013, the Company's Board of Directors had designated the following entities as “Unrestricted Subsidiary” under the indenture governing j2 Global's Notes:
	Ziff Davis, LLC and subsidiaries.
	As required by the indenture governing j2 Global's Notes, information sufficient to ascertain the financial condition and results of operations excluding the Unrestricted Subsidiaries must be presented. Accordingly, the Company is presenting the following tables.
	The consolidated financial position of the Unrestricted Subsidiaries as of December 31, 2013 is as follows (in thousands):
		December 31, 2013
	ASSETS
	Cash and cash equivalents	$	16,506
	Accounts receivable	47,804
	Prepaid expenses and other current assets	3,090
	Deferred income taxes	2,704
	Total current assets	70,104
	Property and equipment, net	13,358
	Trade names, net	49,701
	Customer relationships, net	53,169
	Goodwill	140,740
	Other purchased intangibles, net	3,208
	Deferred income taxes	1,463
	Other assets	1,543
	Total assets	$	333,286
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Accounts payable and accrued expenses	$	23,087
	Income taxes payable	3,294
	Deferred revenue	2,743
	Deferred income taxes	679
	Total current liabilities	29,803
	Deferred income taxes	21,696
	Total liabilities	51,499
	Additional paid-in capital	297,390
	Retained earnings	(15,366		)
	Accumulated other comprehensive loss	(237		)
	Total stockholders’ equity	281,787
	Total equity	281,787
	Total liabilities and stockholders’ equity	$	333,286
	The consolidated results of operations of the Unrestricted Subsidiaries for the year ended December 31, 2013 is as follows (in thousands):
		Year Ended December 31,
		2013
	Revenues	$	131,146
	Cost of revenues	16,982
	Gross profit	114,164
	Operating expenses:
	Sales and marketing	64,923
	Research, development and engineering	5,427
	General and administrative	37,082
	Total operating expenses	107,432
	Income from operations	6,732
	Other income (expenses):
	Interest expense (income), net	11,215
	Other expense (income), net	12,229
	Loss before income taxes	(16,712		)
	Income tax (benefit) expense	(265		)
	Net loss	(16,447		)
	Less net income attributable to noncontrolling interest	—
	Net loss attributable to common stockholders	$	(16,447	)

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On February 10, 2014, in a cash transaction the Company acquired LiveDrive Holdings, Ltd., a UK-based provider of online backup with added file sync features for professionals and individuals.
	On February 11, 2014, the Company's Board of Directors approved a quarterly cash dividend of $0.2625 per share of common stock payable on March 10, 2014 to all stockholders of record as of the close of business on February 24, 2014.
	On February 11, 2014, the Company's Board of Directors extended by one year the Company's share repurchase program set to expire February 20, 2014 to February 20, 2015.

Basis_Of_Presentation_Policy

Basis Of Presentation (Policy)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Consolidation, Policy [Policy Text Block]	'
	(a)	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of j2 Global and its direct and indirect wholly-owned and less-than-wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Use Of Estimates	'
	(b)	Use of Estimates
	The preparation of consolidated financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, including judgments about investment classifications, and the reported amounts of net revenue and expenses during the reporting period. On an ongoing basis, management evaluates its estimates based on historical experience and on various other factors that the Company believes to be reasonable under the circumstances. Actual results could differ from those estimates.
	In the first quarter of 2011, the Company made a change in estimate regarding the remaining service obligations to its annual eFax® subscribers. As a result of system upgrades, the Company is now basing the estimate on the actual remaining service obligations to these customers. Due to this change, the Company recorded a one-time, non-cash increase to deferred revenues of $10.3 million with an equal offset to revenues. This change in estimate reduced net income by approximately $7.6 million, net of tax, and reduced basic and diluted earnings per share for the year ended December 31, 2011 by $0.17 and $0.16, respectively.
Allowances For Doubtful Accounts	'
	(c)	Allowances for Doubtful Accounts
	j2 Global reserves for receivables it may not be able to collect. These reserves for the Company's Business Cloud Services are typically driven by the volume of credit card declines and past due invoices and are based on historical experience as well as an evaluation of current market conditions. These reserves for the Company's Digital Media segment are typically driven by past due invoices and are based on historical experience. On an ongoing basis, management evaluates the adequacy of these reserves.
Revenue Recognition	'
	(d)	Revenue Recognition
	Business Cloud Services
	The Company's Business Cloud Services revenues substantially consist of monthly recurring subscription and usage-based fees, which are primarily paid in advance by credit card. In accordance with GAAP, the Company defers the portions of monthly, quarterly, semi-annually and annually recurring subscription and usage-based fees collected in advance and recognizes them in the period earned. Additionally, the Company defers and recognizes subscriber activation fees and related direct incremental costs over a subscriber's estimated useful life.
	j2 Global's Business Cloud Services also include patent license revenues generated under license agreements that provide for the payment of contractually determined fully paid-up or royalty-bearing license fees to j2 Global in exchange for the grant of non-exclusive, retroactive and future licenses to our intellectual property, including patented technology. Patent revenues may also consist of revenues generated from the sale of patents. Patent license revenues are recognized when earned over the term of the license agreements. With regard to fully paid-up license arrangements, the Company recognizes as revenue in the period the license agreement is executed the portion of the payment attributable to past use of the intellectual property and amortizes the remaining portion of such payments on a straight-line basis over the life of the licensed patent(s). With regard to royalty-bearing license arrangements, the Company recognizes revenues of license fees earned during the applicable period. With regard to patent sales, the Company recognizes as revenue in the period of the sale the amount of the purchase price over the carrying value of the patent(s) sold.
	The Business Cloud Services business also generates revenues by licensing certain technology to third parties. These licensing revenues are recognized when earned in accordance with the terms of the underlying agreement. Generally, revenue is recognized as the third party uses the licensed technology over the period.
	Digital Media
	The Company's Digital Media revenues primarily consist of revenues generated from the sale of advertising campaigns that are targeted to the Company's proprietary websites and to those websites operated by third parties that are part of the Digital Media business's advertising network. Revenues for these advertising campaigns are recognized as earned either when an ad is placed for viewing by a visitor to the appropriate web page or when the visitor "clicks through" on the ad, depending upon the terms with the individual advertiser.
	Revenues for Digital Media business-to-business operations consist of lead-generation campaigns for IT vendors and are recognized as earned when the Company delivers the qualified leads to the customer.
	j2 Global also generates Digital Media revenues through the license of certain assets to clients, for the clients' use in their own promotional materials or otherwise. Such assets may include logos, editorial reviews, or other copyrighted material. Revenues under such license agreements are recognized when the assets are delivered to the client. The Digital Media business also generates other types of revenues, including business listing fees, subscriptions to online publications, and from other sources. Such other revenues are recognized as earned.
Fair Value Measurements	'
	(e)	Fair Value Measurements
	j2 Global complies with the provisions of Financial Accounting Standards Board (“FASB”) ASC Topic No. 820, Fair Value Measurements and Disclosures (“ASC 820”), in measuring fair value and in disclosing fair value measurements. ASC 820 provides a framework for measuring fair value and expands the disclosures required for fair value measurements of financial and non-financial assets and liabilities.
	As of December 31, 2013 and December 31, 2012, the carrying value of cash and cash equivalents, short-term investments, accounts receivable, interest receivable, accounts payable, accrued expenses, interest payable, customer deposits and long-term debt are reflected in the financial statements at cost. With the exception of long-term debt, cost approximates fair value due to the short-term nature of such instruments. The fair value of the Company's senior unsecured notes was determined using the quoted market prices of debt instruments with similar terms and maturities. As of the same dates, the carrying value of other long-term liabilities approximated fair value as the related interest rates approximate rates currently available to j2 Global.
Cash and Cash Equivalents, Policy [Policy Text Block]	'
	(f)	Cash and Cash Equivalents
	j2 Global considers cash equivalents to be only those investments that are highly liquid, readily convertible to cash and with maturities of three months or less at the purchase date.
Investment, Policy [Policy Text Block]	'
	(g)	Investments
	j2 Global accounts for its investments in debt and equity securities in accordance with FASB ASC Topic No. 320, Investments - Debt and Equity Securities (“ASC 320”). Debt investments are typically comprised of corporate and governmental debt securities. Equity securities recorded as available-for-sale represent strategic equity investments. j2 Global determines the appropriate classification of its investments at the time of acquisition and evaluates such determination at each balance sheet date. Held-to-maturity securities are those investments which the Company has the ability and intent to hold until maturity and are recorded at amortized cost. Available-for-sale securities are those investments j2 Global does not intend to hold to maturity and can be sold. Available-for-sale securities are carried at fair value with unrealized gains and losses included in other comprehensive income. Trading securities are carried at fair value, with unrealized gains and losses included in investment income. All securities are accounted for on a specific identification basis.
Debt, Policy [Policy Text Block]	'
	(h)	Debt Issuance Costs and Debt Discount
	j2 Global capitalizes costs incurred with borrowing and issuance of debt securities and records debt discounts as a reduction to the debt amount. j2 Global capitalized costs incurred in connection with its sale of senior unsecured notes within long-term other assets and recorded the original purchase discount as a reduction to such notes (See Note 8 - Long Term Debt). These costs and discounts are amortized and included in interest expense over the life of the borrowing or term of the credit facility using the interest method.
Concentration Of Credit Risk	'
	(i)	Concentration of Credit Risk
	All of the Company’s cash, cash equivalents and marketable securities are invested at major financial institutions primarily within the United States, United Kingdom and Ireland. These institutions are required to invest the Company’s cash in accordance with the Company’s investment policy with the principal objectives being preservation of capital, fulfillment of liquidity needs and above market returns commensurate with preservation of capital. The Company’s investment policy also requires that investments in marketable securities be in only highly rated instruments, with limitations on investing in securities of any single issuer. However, these investments are not insured against the possibility of a total or near complete loss of earnings or principal and are inherently subject to the credit risk related to the continued credit worthiness of the underlying issuer and general credit market risks. At December 31, 2013 and December 31, 2012, the Company’s cash and cash equivalents were maintained in accounts that are insured up to the limit determined by the applicable governmental agency. The Company's deposits held in qualifying financial institutions in Ireland are fully insured through March 28, 2018 to the extent on deposit prior to March 28, 2013. With respect to the Company's deposits with financial institutions in other jurisdictions, the insured amount held in other institutions is immaterial in comparison to the total amount of the Company’s cash and cash equivalents held by these institutions which is not insured. These institutions are primarily in the United States and United Kingdom, however, the Company has accounts within several other countries including Australia, Austria, China, France, Germany, Italy, Japan, New Zealand, the Netherlands and Poland.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	'
	(j)	Foreign Currency
	Some of j2 Global's foreign subsidiaries use the local currency of their respective countries as their functional currency. Assets and liabilities are translated at exchange rates prevailing at the balance sheet dates. Revenues, costs and expenses are translated into U.S. Dollars at average exchange rates for the period. Gains and losses resulting from translation are recorded as a component of accumulated other comprehensive income/(loss). Net translation gain/ (loss) were $0.1 million, $1.4 million and $(0.8) million for the years ended December 31, 2013, 2012 and 2011, respectively. Realized gains and losses from foreign currency transactions are recognized within other expense (income)net.  Net transaction gain/ (loss) was $0.4 million, $(0.1) million and zero for the years ended December 31, 2013, 2012 and 2011, respectively.
Property, Plant and Equipment, Policy [Policy Text Block]	'
	(k)	Property and Equipment
	Property and equipment are stated at cost. Equipment under capital leases is stated at the present value of the minimum lease payments. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives of property and equipment range from one to 10 years. Fixtures, which are comprised primarily of leasehold improvements and equipment under capital leases, are amortized on a straight-line basis over their estimated useful lives or for leasehold improvements, the related lease term, if less. The Company has capitalized certain internal use software and website development costs which are included in property and equipment. The estimated useful life of costs capitalized is evaluated for each specific project and ranges from 1 to 5 years.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	'
	(l)	Long-Lived Assets
	j2 Global accounts for long-lived assets, which include property and equipment and identifiable intangible assets with finite useful lives (subject to amortization), in accordance with the provisions of FASB ASC Topic No. 360, Property, Plant, and Equipment (“ASC 360”), which requires that long-lived assets be reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by comparing the carrying amount of an asset to the expected future net cash flows generated by the asset. If it is determined that the asset may not be recoverable, and if the carrying amount of an asset exceeds its estimated fair value, an impairment charge is recognized to the extent of the difference.
	j2 Global assessed whether events or changes in circumstances have occurred that potentially indicate the carrying amount of long-lived assets may not be recoverable. No impairment was recorded in fiscal year 2013, 2012 and 2011.
Goodwill and Intangible Assets, Policy [Policy Text Block]	'
	(m)	Goodwill and Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. Intangible assets resulting from the acquisitions of entities accounted for using the purchase method of accounting are recorded at the estimated fair value of the assets acquired. Identifiable intangible assets are comprised of purchased customer relationships, trademarks and trade names, developed technologies and other intangible assets. Intangible assets subject to amortization are amortized over the period of estimated economic benefit ranging from 1 to 20 years. In accordance with FASB ASC Topic No. 350, Intangibles - Goodwill and Other (“ASC 350”), goodwill and other intangible assets with indefinite lives are not amortized but tested annually for impairment or more frequently if j2 Global believes indicators of impairment exist. In connection with the annual impairment test for goodwill, the Company has the option to perform a qualitative assessment in determining whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company determines that it was more likely than not that the fair value of the reporting unit is less than its carrying amount, then it performs the impairment test upon goodwill. In connection with the annual impairment test for intangible assets, we have the option to perform a qualitative assessment in determining whether it is more likely than not that the fair value is less than its carrying amount, then we perform the impairment test upon intangible assets. The impairment test involves a two-step process. The first step involves comparing the fair values of the applicable reporting units with their aggregate carrying values, including goodwill. The Company generally determines the fair value of its reporting units using the income approach methodology of valuation. If the carrying value of a reporting unit exceeds the reporting unit's fair value, j2 Global performs the second step of the test to determine the amount of impairment loss. The second step involves measuring the impairment by comparing the implied fair values of the affected reporting unit's goodwill and intangible assets with the respective carrying values. j2 Global completed the required impairment review at the end of 2013, 2012 and 2011 and concluded that there were no impairments. Consequently, no impairment charges were recorded.
Income Taxes	'
	(n)	Income Taxes
	j2 Global's income is subject to taxation in both the U.S. and numerous foreign jurisdictions. Significant judgment is required in evaluating the Company's tax positions and determining its provision for income taxes. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. j2 Global establishes reserves for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. These reserves for tax contingencies are established when the Company believes that certain positions might be challenged despite the Company's belief that its tax return positions are fully supportable. j2 Global adjusts these reserves in light of changing facts and circumstances, such as the outcome of a tax audit or lapse of a statute of limitations. The provision for income taxes includes the impact of reserve provisions and changes to reserves that are considered appropriate.
	j2 Global accounts for income taxes in accordance with FASB ASC Topic No. 740, Income Taxes (“ASC 740”), which requires that deferred tax assets and liabilities be recognized using enacted tax rates for the effect of temporary differences between the book and tax basis of recorded assets and liabilities. ASC 740 also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that some or all of the net deferred tax assets will not be realized. The valuation allowance is reviewed quarterly based upon the facts and circumstances known at the time. In assessing this valuation allowance, j2 Global reviews historical and future expected operating results and other factors, including its recent cumulative earnings experience, expectations of future taxable income by taxing jurisdiction and the carryforward periods available for tax reporting purposes, to determine whether it is more likely than not that deferred tax assets are realizable.
	ASC 740 provides guidance on the minimum threshold that an uncertain income tax benefit is required to meet before it can be recognized in the financial statements and applies to all income tax positions taken by a company. ASC 740 contains a two-step approach to recognizing and measuring uncertain income tax positions. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. If it is not more likely than not that the benefit will be sustained on its technical merits, no benefit will be recorded. Uncertain income tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold. j2 Global recognized accrued interest and penalties related to uncertain income tax positions in income tax expense on its consolidated statement of income.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	'
	(o)	Share-Based Compensation
	j2 Global accounts for share-based awards in accordance with the provisions of FASB ASC Topic No. 718, Compensation - Stock Compensation (“ASC 718”). Accordingly, j2 Global measures share-based compensation expense at the grant date, based on the fair value of the award, and recognizes the expense over the employee's requisite service period using the straight-line method. The measurement of share-based compensation expense is based on several criteria, including but not limited to the valuation model used and associated input factors, such as expected term of the award, stock price volatility, risk free interest rate, dividend rate and award cancellation rate. These inputs are subjective and are determined using management's judgment. If differences arise between the assumptions used in determining share-based compensation expense and the actual factors, which become known over time, j2 Global may change the input factors used in determining future share-based compensation expense. Any such changes could materially impact the Company's results of operations in the period in which the changes are made and in periods thereafter. Beginning in the first quarter 2012, the Company estimates the expected term based upon the historical exercise behavior of our employees. Previously, the Company elected to use the simplified method for estimating the expected term. Under the simplified method, the expected term is equal to the midpoint between the vesting period and the contractual term of the stock option.
	j2 Global accounts for option grants to non-employees in accordance with FASB ASC Topic No. 505, Equity, whereby the fair value of such options is determined using the Black-Scholes option pricing model at the earlier of the date at which the non-employee's performance is complete or a performance commitment is reached.
Earnings Per Share, Policy [Policy Text Block]	'
	(p)	Earnings Per Common Share
	EPS is calculated pursuant to the two-class method as defined in ASC Topic No. 260, Earnings per Share (“ASC 260”), which specifies that all outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends or dividend equivalents are considered participating securities and should be included in the computation of EPS pursuant to the two-class method.
	Basic EPS is calculated by dividing net distributed and undistributed earnings allocated to common shareholders, excluding participating securities and the net income attributable to noncontrolling interest, by the weighted-average number of common shares outstanding. The Company's participating securities consist of its unvested share-based payment awards that contain rights to nonforfeitable dividends or dividend equivalents. Diluted EPS includes the determinants of basic EPS and, in addition, reflects the impact of other potentially dilutive shares outstanding during the period.  The dilutive effect of participating securities is calculated under the more dilutive of either the treasury method or the two-class method.
Research and Development Expense, Policy [Policy Text Block]	'
	(q)	Research, Development and Engineering
	Research, development and engineering costs are expensed as incurred. Costs for software development incurred subsequent to establishing technological feasibility, in the form of a working model, are capitalized and amortized over their estimated useful lives. To date, software development costs incurred after technological feasibility has been established have not been material.
Segment Reporting, Policy [Policy Text Block]	'
	(r)	Segment Reporting
	FASB ASC Topic No. 280, Segment Reporting (“ASC 280”), establishes standards for the way that public business enterprises report information about operating segments in annual consolidated financial statements and requires that those enterprises report selected information about operating segments in interim financial reports. ASC 280 also establishes standards for related disclosures about products and services, geographic areas and major customers. As a result of the acquisition of Ziff Davis, Inc. as described in Note 3 - Business Acquisitions, the Company operates as two segments: (1) Business Cloud Services and (2) Digital Media.
Advertising Costs, Policy [Policy Text Block]	'
	(s)	Advertising Costs
	Advertising costs are expensed as incurred. Advertising costs for the year ended December 31, 2013, 2012 and 2011 was $55.4 million, $48.1 million and $45.4 million, respectively.
Revenue Recognition, Excise and Sales Taxes	'(t)Sales TaxesThe Company may collect sales taxes from certain customers which are remitted to governmental authorities as required and are excluded from revenues.
New Accounting Pronouncements, Policy [Policy Text Block]	'
	(u)	Recent Accounting Pronouncements
	In July 2012, the FASB issued ASU No. 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment, which simplifies how entities test indefinite-lived intangible assets other than goodwill for impairment and permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of the indefinite-lived intangible asset is less than its carrying amount as a basis for determining whether it is necessary to perform a quantitative impairment test. This ASU is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012 (early adoption is permitted). The Company adopted this guidance and did not have a significant impact on the Company's consolidated financial position or results of operations.
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, which provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This ASU is effective for fiscal years beginning after December 15, 2013. The Company is currently assessing the impact, if any, from this update with the principal potential impact expected to be related to the presentation of unrecognized tax benefits on the condensed consolidated balance sheet.
Comparability of Prior Year Financial Data, Policy [Policy Text Block]	'
	Reclassifications
	Certain prior year reported amounts have been reclassified to conform with the 2013 presentation.

Business_Acquisition_Tables

Business Acquisition (Tables)	12 Months Ended
	Dec. 31, 2013					Dec. 31, 2012
Business Acquisition [Line Items]	'					'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	'					'
	The following table summarizes the allocation of the purchase consideration for these acquisitions (in thousands):
	Asset	Valuation
	Accounts Receivable	$	24,658
	Property and Equipment		3,274
	Other Assets		2,703
	Deferred Tax Asset		2,058
	Software		3,031
	Content		2,460
	Trade Name		18,581
	Customer Relationship		40,275
	Advertiser Relationship		11,770
	Other Intangibles		168
	Goodwill		54,472
	Total	$	163,450
Business Acquisition, Pro Forma Information [Table Text Block]	'					'
	The supplemental information on an unaudited pro forma financial basis presents the combined results of j2 Global and its 2013 acquisitions as if each acquisition had occurred on January 1, 2012 (in thousands, except per share amounts):					The supplemental information on an unaudited pro forma financial basis presents the combined results of j2 Global and its 2012 acquisitions as if each acquisition had occurred on January 1, 2011 (in thousands, except per share amounts):
		Year ended					Year ended
		December 31,		December 31,			December 31,		December 31,
		2013		2012			2012		2011
		(unaudited)		(unaudited)			(unaudited)		(unaudited)
	Revenues	$	545,952	$	470,190	Revenues	$	417,250	$	385,974
	Net Income	$	108,600	$	122,187	Net Income	$	120,210	$	114,889
	EPS - Basic	$	2.34	$	2.64	EPS - Basic	$	2.6	$	2.47
	EPS - Diluted	$	2.31	$	2.62	EPS - Diluted	$	2.58	$	2.44
Ziff Davis, Inc [Member]	'					'
Business Acquisition [Line Items]	'					'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	'					'
						The following table summarizes the allocation of the purchase consideration (including the portion allocable to the minority interest) as follows (in thousands):
						Asset	Valuation
						Accounts Receivable	$	14,450
						Property and Equipment		842
						Software		4,780
						Other Assets		1,283
						Deferred Tax Asset		1,139
						Trade Name		37,730
						Customer Relationship		5,380
						Advertiser Relationship		14,500
						Licensing Relationship		4,910
						Other Intangibles		2,540
						Goodwill		112,882
						Total	$	200,436

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments [Abstract]	'
Schedule Of Debt Securities By Contractual Maturity Date	'
	The following table summarizes j2 Global’s debt securities designated as available-for-sale, classified by the contractual maturity date of the security (in thousands):
		December 31,		December 31, 2012
		2013
	Due within 1 year	$	46,339	$	46,681
	Due within more than 1 year but less than 5 years	44,865		17,209
	Due within more than 5 years but less than 10 years	—		—
	Due 10 years or after	2,486		2,633
	Total	$	93,690	$	66,523
Schedule Of Available-For-Sale And Trading Securities	'
	The following table summarizes the Company’s investments designated as trading and available-for-sale (in thousands):
		December 31,		December 31, 2012
		2013
	Trading	$	—	$	3
	Available-for-sale	123,737		90,017
	Total	$	123,737	$	90,020
Summary Of Gross Unrealized Gains And Losses And Fair Values	'
	The following table summarizes the gross unrealized gains and losses and fair values for investments as of December 31, 2013 and December 31, 2012 aggregated by major security type (in thousands):
		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value
				Gains		Losses
	December 31, 2013
	Debt Securities	$	93,569	$	158	$	(37	)	$	93,690
	Equity Securities	20,610		9,558		(121		)	30,047
	Total	$	114,179	$	9,716	$	(158	)	$	123,737
	December 31, 2012
	Debt Securities	$	66,541	$	149	$	(167	)	$	66,523
	Equity Securities	$	20,610	$	3,251	$	(367	)	$	23,494
	Total	$	87,151	$	3,400	$	(534	)	$	90,017

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Schedule Of Fair Values Of Financial Instruments Measured On Recurring Basis	'
	The following tables present the fair values of the Company’s financial instruments that are measured at fair value on a recurring basis (in thousands):
	December 31, 2013	Level 1		Level 2		Level 3		Fair Value
	Cash equivalents:
	Money market and other funds	101,232		—		—		101,232
	Time deposits	22,773		—		—		22,773
	Certificates of Deposit	14,402		—		—		14,402
	Equity securities	30,047		—		—		30,047
	Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	23,702		—		—		23,702
	Debt securities issued by states of the United States and political subdivisions of the states	3,296		—		—		3,296
	Debt securities issued by foreign governments	—		—		—		—
	Corporate debt securities	66,692		—		—		66,692
	Total	$	262,144	$	—	$	—	$	262,144
	December 31, 2012	Level 1		Level 2		Level 3		Fair Value
	Cash equivalents:
	Money market and other funds	99,351		—		—		99,351
	Time deposits	22,093		—		—		22,093
	Certificates of Deposit	34,876		—		—		34,876
	Equity securities	23,497		—		—		23,497
	Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	6,450		—		—		6,450
	Debt securities issued by states of the United States and political subdivisions of the states	11,658		—		—		11,658
	Debt securities issued by foreign governments	3,589		—		—		3,589
	Corporate debt securities	44,826		—		—		44,826
	Total	$	246,340	$	—	$	—	$	246,340

Property_And_Equipment_Tables

Property And Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property And Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	Property and equipment, stated at cost, at December 31, 2013 and 2012 consisted of the following (in thousands):
		2013			2012
	Computers and related equipment	$	79,576		$	61,471
	Furniture and equipment	1,405			1,300
	Leasehold improvements	5,718			3,938
		86,699			66,709
	Less: Accumulated depreciation and amortization	(55,499		)	(47,110		)
	Total property and equipment, net	$	31,200		$	19,599

Goodwill_And_Intangible_Assets1

Goodwill And Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013											Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]	'											'
Changes In Carrying Amounts Of Goodwill	'											'
	The changes in carrying amounts of goodwill for the year ended December 31, 2013 and 2012 are as follows (in thousands):
	Balance as of January 1, 2012	$	279,016
	Goodwill acquired	128,532
	Foreign Exchange Translation	277
	Balance as of December 31, 2012	$	407,825
	Goodwill acquired	54,472
	Purchase Accounting Adjustments	(5,324		)
	Foreign exchange translation	449
	Balance as of December 31, 2013	$	457,422
Schedule Of Intangible Assets With Indefinite Lives	'											'
	Intangible Assets with Indefinite Lives:
		2013				2012
	Trade name	$	27,379			$	27,379
	Other	5,432				5,433
	Total	$	32,811			$	32,812
Finite-Lived Intangible Assets By Major Class	'											'
	As of December 31, 2013, intangible assets subject to amortization relate primarily to the following (in thousands):											As of December 31, 2012, intangible assets subject to amortization relate primarily to the following (in thousands):
													Weighted-Average	Historical		Accumulated		Net
		Weighted-Average		Historical				Accumulated		Net			Amortization	Cost		Amortization
		Amortization		Cost				Amortization					Period
		Period										Trade names	17.7 years	$	50,257	$	6,227	$	44,030
	Trade names	17.0 years		$	66,911			$	11,182	$	55,729
												Patent and patent licenses	8.2 years	44,048		24,719		19,329
	Patent and patent licenses	8.1 years		58,446				29,916		28,530
												Customer relationships	7.0 years	86,473		21,750		64,723
	Customer relationships	8.1 years		139,362				38,382		100,980
												Other purchased intangibles	4.4 years	13,322		8,900		4,422
	Other purchased intangibles	5.0 years		18,149				12,666		5,483
												Total		$	194,100	$	61,596	$	132,504
	Total			$	282,868			$	92,146	$	190,722
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'											'
	Expected amortization expense for intangible assets subject to amortization at December 31, 2013 are as follows (in thousands):
	Fiscal Year:
	2014	$	34,743
	2015	30,186
	2016	26,506
	2017	23,023
	2018	16,118
	Thereafter	60,146
	Total expected amortization expense	$	190,722

Long_Term_Debt_Tables

Long Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Schedule of Long-term Debt Instruments [Table Text Block]	'
	Long-term debt as of December 31, 2013 consists of the following (in thousands):
	Notes	$	245,670
	Total long-term debt	$	245,670
	Less: Current portion	—
	Total long-term debt, less current portion	$	245,670
Schedule of Maturities of Long-term Debt [Table Text Block]	'
	At December 31, 2013, future principal payments for debt were as follows (in thousands):
	Year Ended December 31,
	2014	$	—
	2015	—
	2016	—
	2017	—
	2018	—
	Thereafter	250,000
		$	250,000

Commitments_And_Contingencies_

Commitments And Contingencies Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	j2 Global leases certain facilities and equipment under non-cancelable operating leases which expire at various dates through 2020. Future minimum lease payments at December 31, 2013 under non-cancelable operating leases (with initial or remaining lease terms in excess of one year) are as follows (in thousands):
		Operating
		Leases
	Fiscal Year:
	2014	$	6,674
	2015	6,167
	2016	5,692
	2017	3,838
	2018	3,344
	Thereafter	2,550
	Total minimum lease payments	$	28,265

Income_Taxes_Income_Taxes_Tabl

Income Taxes Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Taxes [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	The provision for income tax consisted of the following (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Current:
	Federal	$	22,834			$	20,759			$	3,673
	State	2,676				(289		)		412
	Foreign	9,415				11,639				11,443
	Total current	34,925				32,109				15,528
	Deferred:
	Federal	3,678				2,427				6,761
	State	(235		)		314				2,012
	Foreign	(3,193		)		(1,591		)		(1,951		)
	Total deferred	250				1,150				6,822
	Total provision	$	35,175			$	33,259			$	22,350
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	A reconciliation of the statutory federal income tax rate with j2 Global's effective income tax rate is as follows:
		Years Ended December 31,
		2013		2012			2011
	Statutory tax rate	35	%		35	%		35	%
	State income taxes, net	0.3			0.5			0.9
	Foreign rate differential	(17.9	)		(17.4	)		(16	)
	Reserve for uncertain tax positions	4.3			4.9			(5.7	)
	Valuation Allowance	1.9			3.2			(0.1	)
	IRC Section 199 deductions	(0.5	)		(3.4	)		—
	Other	1.6			(1.3	)		2.2
	Effective tax rates	24.7	%		21.5	%		16.3	%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	Deferred tax assets and liabilities result from differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. Temporary differences and carryforwards which give rise to deferred tax assets and liabilities are as follows (in thousands):
		Years Ended December 31,
		2013			2012
	Deferred tax assets:
	Net operating loss carryforwards	9,596			2,890
	Tax credit carryforwards	9,233			7,600
	Accrued expenses	1,196			821
	Allowance for bad debt	1,423			1,028
	Share-based compensation expense	4,917			5,990
	Basis difference in fixed assets	1,266			—
	Impairment of investments	161			355
	Gain on sale of intangible assets	123			137
	Deferred revenue	812			270
	State taxes	1,451			1,534
		30,178			20,625
	Less:  Valuation Allowance	(8,493	)		(5,918	)
	Total deferred tax assets	21,685			14,707
	Deferred tax liabilities:
	Basis difference in fixed assets	—			(84	)
	Basis difference in intangible assets	(47,711	)		(38,864	)
	Prepaid insurance	(369	)		(224	)
	Other	(6,359	)		(5,018	)
	Total deferred tax liabilities	(54,439	)		(44,190	)
	Net deferred tax assets	(32,754	)		(29,483	)
Summary of Income Tax Contingencies [Table Text Block]	'
	A reconciliation of the Company's unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):
	Balance at January 1, 2013	$	35,421
	Decreases related to positions taken during a prior period	(1,646		)
	Increases related to positions taken in the current period	7,113
	Balance at December 31, 2013	$	40,888

Stockholders_Equity_Dividends_

Stockholders' Equity Dividends Declared (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Dividends Declared [Table Text Block]	'
	The following is a summary of each dividend declared during fiscal year 2013:
	Declaration Date	Dividend per Common Share		Record Date	Payment Date
	February 12, 2013	$	0.2325	February 25, 2013	March 4, 2013
	May 7, 2013	$	0.24	May 20, 2013	June 4, 2013
	August 7, 2013	$	0.2475	August 19, 2013	September 3, 2013
	November 5, 2013	$	0.255	November 18, 2013	December 4, 2013

Stock_Options_And_Employee_Sto1

Stock Options And Employee Stock Purchase Plan (Tables)	12 Months Ended
	Dec. 31, 2013
Stock Options Activity	'
	Stock option activity for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:
		Number of Shares		Weighted-Average				Weighted-Average Remaining Contractual Life (In Years)
				Exercise Price
										Aggregate
										Intrinsic
										Value
	Options outstanding at December 31, 2010	3,794,394		$	14.4
	Granted	163,319		$	29.42
	Exercised	(1,820,678	)	$	7.92
	Canceled	(49,340	)	$	24.76
	Options outstanding at December 31, 2011	2,087,695		$	20.99
	Granted	67,000		$	27.26
	Exercised	(357,234	)	$	15.81
	Canceled	(32,000	)	$	31.34
	Options outstanding at December 31, 2012	1,765,461		$	22.08
	Granted	—		$	—
	Exercised	(569,204	)	$	23.9
	Canceled	(20,600	)	$	21.79
	Options outstanding at December 31, 2013	1,175,657		$	21.21			4		$33,858,816
	Exercisable at December 31, 2013	845,198		$	20.35			3.1		$25,068,917
	Vested and expected to vest at December 31, 2013	1,132,886		$	21.01			3.9		$32,856,049
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	'
	The following table summarizes information concerning outstanding and exercisable options as of December 31, 2013:
			Options Outstanding								Exercisable Options
	Range of		Number Outstanding December 31, 2013		Weighted		Weighted				Number	Weighted
	Exercise Prices				Average		Average				Exercisable	Average
					Remaining		Exercise				December 31,	Exercise
					Contractual		Price				2013	Price
					Life
	$9.55		200,000		0.23 years		$	9.55			200,000	$	9.55
	13.74 - 15.65		7,911		0.93 years		15.57				7,911	15.57
	17.19		150,420		5.18 years		17.19				43,280	17.19
	18.77		172,925		1.67 years		18.77				172,925	18.77
	20.15 - 21.67		157,504		4.86 years		21.21				130,152	21.15
	21.88 - 23.11		119,228		6.13 years		22.85				65,244	22.78
	23.40 - 29.34		203,169		6.52 years		28.25				94,686	28.32
	29.53 - 31.07		47,500		8.00 years		30.26				14,000	30.52
	32.45		102,000		3.59 years		32.45				102,000	32.45
	34.73		15,000		3.56 years		34.73				15,000	34.73
	$9.55 - $34.73		1,175,657		4.03 years		$	21.21			845,198	$	20.35
Assumptions To Estimate Fair Value Of Stock Options	'
	The weighted-average fair values of stock options granted have been estimated utilizing the following assumptions:
		Year Ended December 31,
			2012	2011
	Risk-free interest rate		1.10%	2.30%
	Expected term (in years)		5.7	6.5
	Dividend yield		3.20%	2.60%
	Expected volatility		41.60%	41.80%
Allocation Of Share-Based Compensation Expense	'
	The following table represents share-based compensation expense included in cost of revenues and operating expenses in the consolidated statements of income for the years ended December 31, 2013, 2012 and 2011 (in thousands):
		Year Ended December 31,
		2013			2012				2011
	Cost of revenues	$	756		$	844			$	982
	Operating expenses:
	Sales and marketing	1,855			1,543				1,431
	Research, development and engineering	434			459				477
	General and administrative	6,675			6,286				6,103
		$	9,720		$	9,132			$	8,993
Restricted Stock [Member]	'
Restricted Stock And Restricted Stock Unit Award Activity	'
	Restricted stock award activity for the year ended December 31, 2013 is set forth below:
		Shares		Weighted-Average
				Grant-Date
				Fair Value
	Nonvested at January 1, 2013	828,475		$	23.08
	Granted	690,762		13.57
	Vested	(296,966	)	21.46
	Canceled	(43,900	)	24.46
	Nonvested at December 31, 2013	1,178,371		$	17.86
Restricted Stock Units (RSUs) [Member]	'
Restricted Stock And Restricted Stock Unit Award Activity	'
	Restricted stock unit activity for the year ended December 31, 2013 is set forth below:
		Number of		Weighted-Average		Aggregate
		Shares		Remaining		Intrinsic
				Contractual		Value
				Life (in Years)
	Outstanding at January 1, 2012	32,750
	Granted	91,166
	Vested	(1,700	)
	Canceled	(6,750	)
	Outstanding at December 31, 2012	115,466
	Granted	38,375
	Vested	(11,116	)
	Canceled	(33,000	)
	Outstanding at December 31, 2013	109,725		2.2		$	5,487,347
	Vested and expected to vest at December 31, 2013	74,509		1.9		$	3,726,174

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract]	'
Components Of Basic And Diluted Earnings Per Share	'
	The components of basic and diluted earnings per share are as follows (in thousands, except share and per share data):
		Year Ended December 31,
		2013			2012			2011
	Numerator for basic and diluted net income per common share:
	Net income attributable to j2 Global, Inc. common shareholders	$	107,522		$	121,580		$	114,766
	Net income available to participating securities (a)	(2,105		)	(2,075		)	(1,932		)
	Net income available to j2 Global, Inc. common shareholders	105,417			119,505			112,834
	Denominator:
	Weighted-average outstanding shares of common stock	45,548,767			45,459,712			45,799,615
	Dilutive effect of:
	Dilutive effect of equity incentive plans	591,252			321,946			585,233
	Common stock and common stock equivalents	46,140,019			45,781,658			46,384,848
	Net income per share:
	Basic	$	2.31		$	2.63		$	2.46
	Diluted	$	2.28		$	2.61		$	2.43
	(a)	Represents unvested share-based payment awards that contain certain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid).

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting Information [Line Items]	'
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]	'
	Information on reportable segments and reconciliation to consolidated income from operations is as follows (in thousands):
		Years Ended December 31,
		2013			2012		2011
	Revenue by segment:
	Business Cloud Services	$	390,104		$	361,684	$	330,159
	Digital Media	131,146			9,712		—
	Elimination of inter-segment revenues	(449		)	—		—
	Total revenue	520,801			371,396		330,159
	Direct costs by segment(1):
	Business Cloud Services	191,169			174,324		165,833
	Digital Media	124,413			6,823		—
	Direct costs by segment(1):	315,582			181,147		165,833
	Business Cloud Services operating income	198,935			187,360		164,326
	Digital Media operating income	6,733			2,889		—
	Segment operating income	205,668			190,249		164,326
	Global operating costs(2)	30,245			28,087		28,376
	Income from operations	$	175,423		$	162,162	$	135,950
	(1) Direct costs for each segment include cost of revenue and other operating expenses that are directly attributable to the segment such as employee compensation expense, local sales and marketing expenses, engineering and operations, depreciation and amortization and other administrative expenses.
	(2) Global operating costs include general and administrative and other corporate expenses that are managed on a global basis and that are not directly attributable to any particular segment.
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
		2013			2012
	Assets:
	Business Cloud Services	$	818,722		$	788,828
	Digital Media	333,286			204,244
	Total assets from reportable segments	1,152,008			993,072
	Corporate	1,781			2,098
	Total assets	$	1,153,789		$	995,170
		2013			2012		2011
	Capital expenditures:
	Business Cloud Services	10,979			4,240		6,320
	Digital Media	6,635			380		—
	Total from reportable segments	$	17,614		$	4,620	$	6,320
	Corporate	1,012			441		524
	Total capital expenditures	$	18,626		$	5,061	$	6,844
	Depreciation and amortization:
	Business Cloud Services	24,148			20,473		19,342
	Digital Media	14,963			1,167		—
	Total from reportable segments	$	39,111		$	21,640	$	19,342
	Corporate	677			512		415
	Total depreciation and amortization	$	39,788		$	22,152	$	19,757
Summary On Revenues And Long-Lived Assets By Geographic Areas	'
	j2 Global maintains operations in the U.S., Canada, Ireland, Japan and other countries. Geographic information about the U.S. and all other countries for the reporting periods is presented below. Such information attributes revenues based on jurisdictions where revenues are reported (in thousands).
		Year Ended December 31,
		2013			2012		2011
	Revenues:
	United States	$	369,507		$	233,585	$	203,153
	Canada	73,130			79,656		83,066
	Ireland	41,398			41,248		42,652
	All other countries	36,766			16,907		1,288
	Total	$	520,801		$	371,396	$	330,159
		December 31,			December 31,
		2013			2012
	Long-lived assets:
	United States	$	170,247		$	105,549
	All other countries	51,675			46,554
	Total	$	221,922		$	152,103

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2013					Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]	'					'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'					'
						The following table summarizes the changes in accumulated balances of other comprehensive income, net of tax, for the year ended December 31, 2013 (in thousands):
							Unrealized Gains (Losses) on Investments		Foreign Currency Translation			Total
						Beginning balance	$	1,811	$	(1,899	)	$	(88	)
						Other comprehensive income before reclassifications	4,236		(10		)	4,226
						Amounts reclassified from accumulated other comprehensive income	9		88			97
						Net current period other comprehensive income	4,245		78			4,323
						Ending balance	$	6,056	$	(1,821	)	$	4,235
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	'					'
	The following table provides details about reclassifications out of accumulated other comprehensive income for the year ended December 31, 2013 (in thousands):
	Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
		Year Ended December 31, 2013
	Cumulative translation adjustment	$	116		Other expense (income), net
		116			Total, before income taxes
		(28		)	Income tax expense (benefit)
		88			Total, net of tax
	Unrealized gain (loss) on available-for-sale investments	14			Other expense (income), net
		14			Total, before income taxes
		(5		)	Income tax expense (benefit)
		9			Total, net of tax
	Total reclassifications for the period	$	97		Total, net of tax

Quarterly_Results_Tables

Quarterly Results (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Results [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'
		Year Ended December 31, 2013
		Fourth		Third		Second		First
		Quarter		Quarter		Quarter		Quarter
	Revenues	$	138,035	$	127,788	$	141,361	$	113,617
	Gross profit		115,857		105,987		118,682		93,382
	Net income attributable to j2 Global, Inc. common shareholders		20,754		27,806		36,040		22,922
	Net income per common share:
	Basic	$	0.45	$	0.6	$	0.78	$	0.5
	Diluted	$	0.44	$	0.59	$	0.77	$	0.49
	Weighted average shares outstanding
	Basic		45,867,769		45,729,171		45,428,230		45,160,140
	Diluted		46,382,363		46,291,631		46,018,245		45,668,167
		Year Ended December 31, 2012
		Fourth		Third		Second		First
		Quarter		Quarter		Quarter		Quarter
	Revenues	$	102,033	$	93,246	$	89,465	$	86,652
	Gross profit		83,375		76,943		73,278		70,788
	Net income attributable to j2 Global, Inc. common shareholders		30,203		31,650		31,188		28,539
	Net income per common share:
	Basic	$	0.66	$	0.69	$	0.68	$	0.61
	Diluted	$	0.65	$	0.69	$	0.67	$	0.6
	Weighted average shares outstanding
	Basic		45,071,204		45,002,565		45,373,930		46,400,441
	Diluted		45,423,502		45,340,111		45,569,564		46,794,603

Unrestricted_Subsidiaries_Tabl

Unrestricted Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2013
Unrestricted Subsidiaries [Abstract]	'
Schedule of Unrestricted Subsidiaries Financial Information [Table Text Block]	'
	The consolidated financial position of the Unrestricted Subsidiaries as of December 31, 2013 is as follows (in thousands):
		December 31, 2013
	ASSETS
	Cash and cash equivalents	$	16,506
	Accounts receivable	47,804
	Prepaid expenses and other current assets	3,090
	Deferred income taxes	2,704
	Total current assets	70,104
	Property and equipment, net	13,358
	Trade names, net	49,701
	Customer relationships, net	53,169
	Goodwill	140,740
	Other purchased intangibles, net	3,208
	Deferred income taxes	1,463
	Other assets	1,543
	Total assets	$	333,286
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Accounts payable and accrued expenses	$	23,087
	Income taxes payable	3,294
	Deferred revenue	2,743
	Deferred income taxes	679
	Total current liabilities	29,803
	Deferred income taxes	21,696
	Total liabilities	51,499
	Additional paid-in capital	297,390
	Retained earnings	(15,366		)
	Accumulated other comprehensive loss	(237		)
	Total stockholders’ equity	281,787
	Total equity	281,787
	Total liabilities and stockholders’ equity	$	333,286
	The consolidated results of operations of the Unrestricted Subsidiaries for the year ended December 31, 2013 is as follows (in thousands):
		Year Ended December 31,
		2013
	Revenues	$	131,146
	Cost of revenues	16,982
	Gross profit	114,164
	Operating expenses:
	Sales and marketing	64,923
	Research, development and engineering	5,427
	General and administrative	37,082
	Total operating expenses	107,432
	Income from operations	6,732
	Other income (expenses):
	Interest expense (income), net	11,215
	Other expense (income), net	12,229
	Loss before income taxes	(16,712		)
	Income tax (benefit) expense	(265		)
	Net loss	(16,447		)
	Less net income attributable to noncontrolling interest	—
	Net loss attributable to common stockholders	$	(16,447	)

Basis_Of_Presentation_Details

Basis Of Presentation (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Identifiable intangible assets minimum useful life (years)	'	'	'	'	'	'	'	'	'	'1 year 6 months	'
Advertising Expense	'	'	'	'	'	'	'	'	$55,400,000	$48,100,000	$45,400,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-1,821,000	'	'	'	-1,899,000	'	'	'	-1,821,000	-1,899,000	-800,000
Revenues	'	'	'	'	'	'	'	'	520,801,000	371,396,000	330,159,000
Net earnings	20,754,000	27,806,000	36,040,000	22,922,000	30,203,000	31,650,000	31,188,000	28,539,000	107,522,000	121,580,000	114,766,000
Basic earnings per share	$0.45	$0.60	$0.78	$0.50	$0.66	$0.69	$0.68	$0.61	$2.31	$2.63	$2.46
Diluted earnings per share	$0.44	$0.59	$0.77	$0.49	$0.65	$0.69	$0.67	$0.60	$2.28	$2.61	$2.43
Foreign Currency Transaction Gain (Loss), Realized	'	'	'	'	'	'	'	'	400,000	-100,000	0
Remaining Service Obligations To eFax Customers [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	'	'	10,300,000
Net earnings	'	'	'	'	'	'	'	'	'	'	$7,600,000
Basic earnings per share	'	'	'	'	'	'	'	'	'	'	$0.17
Diluted earnings per share	'	'	'	'	'	'	'	'	'	'	$0.16
Minimum [Member]	'	'	'	'	'	'	'	'	'	'	'
Identifiable intangible assets minimum useful life (years)	'	'	'	'	'	'	'	'	'1 year	'	'
Property, Plant and Equipment, Useful Life	'	'	'	'	'	'	'	'	'1 year	'	'
Maximum [Member]	'	'	'	'	'	'	'	'	'	'	'
Identifiable intangible assets minimum useful life (years)	'	'	'	'	'	'	'	'	'20 years	'	'
Property, Plant and Equipment, Useful Life	'	'	'	'	'	'	'	'	'5 years	'	'

Business_Acquisition_Business_

Business Acquisition Business Acquisition (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	$36,600,000	'	'
Business Combination, Consideration Transferred, Liabilities Incurred	15,700,000	28,800,000	'
Deferred income taxes	250,000	1,150,000	6,822,000
Goodwill, Acquired During Period	54,472,000	128,532,000	'
Business Acquisition Contributed Total Revenue	98,100,000	'	'
Business Combination, Consideration Transferred	163,450,000	'	'
IGN Entertainment, Inc [Member]	'	'	'
Goodwill, Period Increase (Decrease)	2,000,000	'	'
Other Acquisitions [Member]	'	'	'
Business Acquisition Contributed Total Revenue	'	16,900,000	'
Business Combination, Consideration Transferred	'	32,900,000	'
Data Haven Limited Buzz Networks Limited And C Infinity [Member]	'	'	'
Business Combination, Consideration Transferred	'	'	3,800,000
Ziff Davis, Inc [Member]	'	'	'
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	'	12,900,000	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	163,100,000	'
Goodwill, Period Increase (Decrease)	1,700,000	'	'
Goodwill, Acquired During Period	'	112,882,000	'
Business Acquisition Contributed Total Revenue	'	9,700,000	'
Business Acquisition Contributed Net Income	'	1,600,000	'
Business Combination, Consideration Transferred	'	$200,436,000	'

Business_Acquisition_Business_1

Business Acquisition Business Acquisitions (Allocation Of Aggregate Purchase Price) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]	'	'
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	$3,274,000	'
Business Acquisition Purchase Price Allocation Current Noncurrent Assets Prepaid Expense and Other Assets	2,703,000	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	2,058,000	'
Goodwill, Acquired During Period	54,472,000	128,532,000
Business Combination, Consideration Transferred	163,450,000	'
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	36,600,000	'
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	24,658,000	'
Developed Technology Rights [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	3,031,000	'
Trade Names [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	2,460,000	'
Trade Names [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	18,581,000	'
Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	40,275,000	'
Licensing Relationship [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	11,770,000	'
Other Intangible Assets [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	168,000	'
Ziff Davis, Inc [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	'	842,000
Business Acquisition Purchase Price Allocation Current Noncurrent Assets Prepaid Expense and Other Assets	'	1,283,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	'	1,139,000
Goodwill, Acquired During Period	'	112,882,000
Business Combination, Consideration Transferred	'	200,436,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	'	12,900,000
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	'	14,450,000
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	163,100,000
Ziff Davis, Inc [Member] | Developed Technology Rights [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	'	4,780,000
Ziff Davis, Inc [Member] | Trade Names [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	37,730,000
Ziff Davis, Inc [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	5,380,000
Ziff Davis, Inc [Member] | Licensing Relationship [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	14,500,000
Ziff Davis, Inc [Member] | Licensing Relationship [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	4,910,000
Ziff Davis, Inc [Member] | Other Intangible Assets [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	$2,540,000

Business_Acquisition_Business_2

Business Acquisition Business Acquisitions (Supplementary Information On Unaudited Pro Forma Financial Results Of Acquisition) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
2012 Business Acquisitions [Member]	'	'
Business Acquisition, Pro Forma Revenue	'	$417,250
Business Acquisition, Pro Forma Net Income (Loss)	'	120,210
Business Acquisition, Pro Forma Earnings Per Share, Basic	'	$2.60
Business Acquisition, Pro Forma Earnings Per Share, Diluted	'	$2.58
2013 Business Acquisitions [Member]	'	'
Business Acquisition, Pro Forma Revenue	545,952	470,190
Business Acquisition, Pro Forma Net Income (Loss)	$108,600	$122,187
Business Acquisition, Pro Forma Earnings Per Share, Basic	$2.34	$2.64
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$2.31	$2.62

Investments_Investments_Narrat

Investments Investments (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investments [Abstract]	'	'
Gain on Sale of Investments	$0.10	$0.30
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax	'	0.1
Restricted Investments, Current	8.2	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	37.3	31.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$2	$2.20

Investments_Schedule_Of_Debt_S

Investments (Schedule Of Debt Securities By Contractual Maturity Date) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments [Abstract]	'	'
Due within 1 year	$46,339	$46,681
Due within more than 1 year but less than 5 years	44,865	17,209
Due within more than 5 years but less than 10 years	0	0
Due 10 years or after	2,486	2,633
Total	$93,690	$66,523

Investments_Schedule_Of_Availa

Investments (Schedule Of Available-For-Sale And Trading Securities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments [Abstract]	'	'
Trading	$0	$3
Available-for-sale Securities	123,737	90,017
Total	$123,737	$90,020

Investments_Summary_Of_Gross_U

Investments (Summary Of Gross Unrealized Gains And Losses And Fair Values) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	$114,179	$87,151
Available-for-sale Securities, Gross Unrealized Gains	9,716	3,400
Available-for-sale Securities, Gross Unrealized Losses	-158	-534
Available-for-sale Securities	123,737	90,017
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	20,610	20,610
Available-for-sale Securities, Gross Unrealized Gains	9,558	3,251
Available-for-sale Securities, Gross Unrealized Losses	-121	-367
Available-for-sale Securities	30,047	23,494
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Securities, Amortized Cost Basis	93,569	66,541
Available-for-sale Securities, Gross Unrealized Gains	158	149
Available-for-sale Securities, Gross Unrealized Losses	-37	-167
Available-for-sale Securities	$93,690	$66,523

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value Measurements (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'	'
Long-term Debt	$245,670,000	$245,194,000
Long-term Debt, Fair Value	$283,300,000	$275,500,000

Fair_Value_Measurements_Schedu

Fair Value Measurements (Schedule Of Fair Values Of Financial Instruments Measured On Recurring Basis) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Total assets	$262,144	$246,340
Money Market Funds [Member]	'	'
Cash	101,232	99,351
Bank Time Deposits [Member]	'	'
Cash	22,773	22,093
Certificates of Deposit [Member]	'	'
Investments	14,402	34,876
Equity Securities [Member]	'	'
Investments	30,047	23,497
Debt Securities Issued By The U.S Treasury And Other U.S Government Corporations And Agencies [Member]	'	'
Investments	23,702	6,450
Debt Securities Issued By States Of The United States And Political Subdivisions Of The States [Member]	'	'
Investments	3,296	11,658
Debt Securities Issued By Foreign Governments [Member]	'	'
Investments	0	3,589
Corporate Debt Securities [Member]	'	'
Investments	66,692	44,826
Level 1 [Member]	'	'
Total assets	262,144	246,340
Level 1 [Member] | Money Market Funds [Member]	'	'
Cash	101,232	99,351
Level 1 [Member] | Bank Time Deposits [Member]	'	'
Cash	22,773	22,093
Level 1 [Member] | Certificates of Deposit [Member]	'	'
Investments	14,402	34,876
Level 1 [Member] | Equity Securities [Member]	'	'
Investments	30,047	23,497
Level 1 [Member] | Debt Securities Issued By The U.S Treasury And Other U.S Government Corporations And Agencies [Member]	'	'
Investments	23,702	6,450
Level 1 [Member] | Debt Securities Issued By States Of The United States And Political Subdivisions Of The States [Member]	'	'
Investments	3,296	11,658
Level 1 [Member] | Debt Securities Issued By Foreign Governments [Member]	'	'
Investments	0	3,589
Level 1 [Member] | Corporate Debt Securities [Member]	'	'
Investments	66,692	44,826
Level 2 [Member]	'	'
Total assets	0	0
Level 2 [Member] | Money Market Funds [Member]	'	'
Cash	0	0
Level 2 [Member] | Bank Time Deposits [Member]	'	'
Cash	0	0
Level 2 [Member] | Certificates of Deposit [Member]	'	'
Investments	0	0
Level 2 [Member] | Equity Securities [Member]	'	'
Investments	0	0
Level 2 [Member] | Debt Securities Issued By The U.S Treasury And Other U.S Government Corporations And Agencies [Member]	'	'
Investments	0	0
Level 2 [Member] | Debt Securities Issued By States Of The United States And Political Subdivisions Of The States [Member]	'	'
Investments	0	0
Level 2 [Member] | Debt Securities Issued By Foreign Governments [Member]	'	'
Investments	0	0
Level 2 [Member] | Corporate Debt Securities [Member]	'	'
Investments	0	0
Level 3 [Member]	'	'
Total assets	0	0
Level 3 [Member] | Money Market Funds [Member]	'	'
Cash	0	0
Level 3 [Member] | Bank Time Deposits [Member]	'	'
Cash	0	0
Level 3 [Member] | Certificates of Deposit [Member]	'	'
Investments	0	0
Level 3 [Member] | Equity Securities [Member]	'	'
Investments	0	0
Level 3 [Member] | Debt Securities Issued By The U.S Treasury And Other U.S Government Corporations And Agencies [Member]	'	'
Investments	0	0
Level 3 [Member] | Debt Securities Issued By States Of The United States And Political Subdivisions Of The States [Member]	'	'
Investments	0	0
Level 3 [Member] | Debt Securities Issued By Foreign Governments [Member]	'	'
Investments	0	0
Level 3 [Member] | Corporate Debt Securities [Member]	'	'
Investments	$0	$0

Property_And_Equipment_Propert

Property And Equipment Property And Equipment (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property And Equipment [Abstract]	'	'	'
Depreciation	$9.60	$6.20	$6.30
Property, Plant and Equipment, Disposals	$0.90	$0.90	$0.30

Property_And_Equipment_Propert1

Property And Equipment Property And Equipment (Property And Equipment) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	$86,699	$66,709
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	-55,499	-47,110
Property and equipment, net	31,200	19,599
Computer Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	79,576	61,471
Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	1,405	1,300
Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, Plant and Equipment, Gross	$5,718	$3,938

Goodwill_And_Intangible_Assets2

Goodwill And Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]	'	'	'
Intangible assets subjected to amortization	'	$0.90	'
Identifiable intangible assets minimum useful life (years)	'	'1 year 6 months	'
Amortization expense	$30.20	$16	$13.40
Minimum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Identifiable intangible assets minimum useful life (years)	'1 year	'	'
Maximum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Identifiable intangible assets minimum useful life (years)	'20 years	'	'

Goodwill_And_Intangible_Assets3

Goodwill And Intangible Assets (Changes In Carrying Amounts Of Goodwill And Other Intangible Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]	'	'
Balance at beginning period	$407,825	$279,016
Goodwill, Acquired During Period	54,472	128,532
Purchase Accounting Adjustments	-5,324	'
Foreign Exchange Translation	449	277
Balance at ending period	$457,422	$407,825

Goodwill_And_Intangible_Assets4

Goodwill And Intangible Assets (Indefinite Intangible Assets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Intangible assets	$32,811	$32,812
Trade Names [Member]	'	'
Intangible assets	27,379	27,379
Other Intangible Assets [Member]	'	'
Intangible assets	$5,432	$5,433

Goodwill_And_Intangible_Assets5

Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Historical Cost	$282,868	$194,100
Accumulated Amortization	-92,146	-61,596
Net	190,722	132,504
Weighted-Average Amortization Period, years	'	'1 year 6 months
Trade Names [Member]	'	'
Historical Cost	66,911	50,257
Accumulated Amortization	-11,182	-6,227
Net	55,729	44,030
Weighted-Average Amortization Period, years	'17 years	'17 years 8 months 12 days
Patents And Patent Licenses [Member]	'	'
Historical Cost	58,446	44,048
Accumulated Amortization	-29,916	-24,719
Net	28,530	19,329
Weighted-Average Amortization Period, years	'8 years 1 month 6 days	'8 years 2 months 12 days
Customer Relationships [Member]	'	'
Historical Cost	139,362	86,473
Accumulated Amortization	-38,382	-21,750
Net	100,980	64,723
Weighted-Average Amortization Period, years	'8 years 1 month 6 days	'7 years
Other Purchased Intangibles [Member]	'	'
Historical Cost	18,149	13,322
Accumulated Amortization	-12,666	-8,900
Net	$5,483	$4,422
Weighted-Average Amortization Period, years	'5 years	'4 years 4 months 24 days

Goodwill_And_Intangible_Assets6

Goodwill And Intangible Assets Goodwill And Intangible Assets (Intangible Assets Subject To Amortization) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Estimated future amortization expense in year 2014	$34,743	'
Estimated future amortization expense in year 2015	30,186	'
Estimated future amortization expense in year 2016	26,506	'
Estimated future amortization expense in year 2017	23,023	'
Estimated future amortization expense in year 2018	16,118	'
Estimated future amortization expense thereafter	60,146	'
Finite-Lived Intangible Assets, Net	190,722	132,504
Patents And Patent Licenses [Member]	'	'
Finite-Lived Intangible Assets, Net	$28,530	$19,329

Long_Term_Debt_Details

Long Term Debt (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Jul. 26, 2012
Long-term Debt, Unclassified [Abstract]	'	'	'	'
Debt Instrument, Issuance Date	'	26-Jul-12	'	'
Debt Instrument, Face Amount	$250,000,000	$250,000,000	'	'
Debt Instrument, Interest Rate, Stated Percentage	8.00%	8.00%	'	'
Debt Instrument, Maturity Date	'	1-Aug-20	'	'
Proceeds from Debt, Net of Issuance Costs	'	245,000,000	'	'
Debt Instrument, Unamortized Discount	4,300,000	4,300,000	'	5,000,000
Debt Issuance Cost	'	1,200,000	'	'
Debt Instrument, Frequency of Periodic Payment	'semi-annually	'	'	'
Debt Instrument, Date of First Required Payment	'	1-Feb-13	'	'
Debt Instrument, Call Date, Earliest	'	1-Aug-16	'	'
Debt Instrument, Covenant Description	'	'The indenture to the Notes contain certain restrictive and other covenants applicable to j2 Global and subsidiaries designated as restricted subsidiaries including, but not limited to, limitations on debt and disqualified or preferred stock, restricted payments, liens, sale and leaseback transactions, dividends and other payment restrictions, asset sales and transactions with affiliates.	'	'
Debt Instrument [Line Items]	'	'	'	'
Long-term Debt	245,670,000	245,670,000	245,194,000	'
Long-term Debt, Current Maturities	0	0	'	'
Total long-term debt, less current portion	245,670,000	245,670,000	'	'
Long-term Debt, Fair Value	$283,300,000	$283,300,000	$275,500,000	'

Long_Term_Debt_Long_Term_Debt_

Long Term Debt Long Term Debt (Schedule Of Maturities Of Long-term Debt) (Details) (USD $)	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	250,000,000
Long-term Debt	$250,000,000

Mandatorily_Redeemable_Financi1

Mandatorily Redeemable Financial Instrument (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Mandatorily Redeemable Financial Instrument [Abstract]	'	'	'
Loss on extinguishment of debt and related interest expense	$14,437	$0	$0
Mandatorily redeemable financial instrument	$0	$8,740	'

Commitments_And_Contingencies_1

Commitments And Contingencies Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Rent Expense, Net	$7.70	$3.20	$2.90
Line of Credit Facility, Maximum Borrowing Capacity	40	'	'
Debt instrument, security interest of stock issued percentage	65.00%	'	'
Letter Of Credit Sublimit [Member]	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	$10	'	'
Base Interest Rate [Member]	'	'	'
London Inter Bank Offered Rate Margin	1.50%	'	'
Federal Funds Rate Margin	0.50%	'	'
Minimum [Member]	'	'	'
London Inter Bank Offered Rate Margin	1.50%	'	'
Minimum [Member] | Base Interest Rate [Member]	'	'	'
London Inter Bank Offered Rate Margin	0.50%	'	'
Maximum [Member]	'	'	'
London Inter Bank Offered Rate Margin	2.00%	'	'
Maximum [Member] | Base Interest Rate [Member]	'	'	'
London Inter Bank Offered Rate Margin	1.00%	'	'

Commitments_And_Contingencies_2

Commitments And Contingencies Comitments And Contingencies (Summary Of Future Minimum Lease Payments Under Non-Cancelable Operating Leases) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies [Abstract]	'
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$6,674
Operating Leases, Future Minimum Payments, Due in Two Years	6,167
Operating Leases, Future Minimum Payments, Due in Three Years	5,692
Operating Leases, Future Minimum Payments, Due in Four Years	3,838
Operating Leases, Future Minimum Payments, Due in Five Years	3,344
Operating Leases, Future Minimum Payments, Due Thereafter	2,550
Operating Leases, Future Minimum Payments Due	$28,265

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2007

Dec. 31, 2006

Dec. 31, 2005

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Dec. 31, 2008

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

California Franchise Tax Board [Member]

California Franchise Tax Board [Member]

California Franchise Tax Board [Member]

California Franchise Tax Board [Member]

California Franchise Tax Board [Member]

California Franchise Tax Board [Member]

Internal Revenue Service (IRS) [Member]

Internal Revenue Service (IRS) [Member]

Internal Revenue Service (IRS) [Member]

Internal Revenue Service (IRS) [Member]

State and Local Jurisdiction [Member]

Canada Revenue Agency [Member]

Canada Revenue Agency [Member]

Illinois Department of Revenue [Member]

Illinois Department of Revenue [Member]

New York City Department of Finance [Member]

New York City Department of Finance [Member]

New York City Department of Finance [Member]

Income Taxes [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Tax Assets, Net of Valuation Allowance

$21,685,000

$14,707,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Tax Assets, Valuation Allowance

-8,493,000

-5,918,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating Loss Carryforwards

'

'

'

'

'

'

'

'

'

22,900,000

'

'

'

700,000

'

'

'

'

'

'

'

Operating Loss Carryforwards, Expiration Dates

'

'

'

'

'

'

'

'

'

31-Dec-28

'

'

'

31-Dec-30

'

'

'

'

'

'

'

Deferred Tax Assets, Tax Credit Carryforwards, Research

900,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax Credit Carryforward, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

'

'

'

'

'

'

'

Liability for Uncertain Tax Positions, Current

5,535,000

5,523,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

U.S. federal statutory rate

35.00%

35.00%

35.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective income tax rate

24.70%

21.50%

16.30%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income before income taxes, domestic operations

61,000,000

54,200,000

60,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income before income taxes, foreign operations

81,700,000

100,700,000

76,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liabilities for uncertain income tax positions

40,888,000

35,421,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash paid for income taxes

28,300,000

20,400,000

13,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Prepaid tax payments

11,300,000

9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Tax Examination, Year under Examination

'

'

'

'2011

'2010

'2009

'2007

'2006

'2005

'

'2011

'2010

'2009

'

'2011

'2010

'2009

'2008

'2011

'2010

'2009

Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Undistributed Earnings of Foreign Subsidiaries

389,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Tax Benefit from Compensation Expense

7,100,000

3,300,000

15,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions

7,113,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions

-1,646,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liability For Uncertain Income Tax Positions

$43,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Income_Taxes_Comp

Income Taxes Income Taxes (Components Of Income Tax) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]	'	'	'
Current Federal Tax Expense (Benefit)	$22,834	$20,759	$3,673
Current State and Local Tax Expense (Benefit)	2,676	-289	412
Current Foreign Tax Expense (Benefit)	9,415	11,639	11,443
Current Income Tax Expense (Benefit)	34,925	32,109	15,528
Deferred Federal Income Tax Expense (Benefit)	3,678	2,427	6,761
Deferred State and Local Income Tax Expense (Benefit)	-235	314	2,012
Deferred Foreign Income Tax Expense (Benefit)	-3,193	-1,591	-1,951
Deferred income taxes	250	1,150	6,822
Income tax expense	$35,175	$33,259	$22,350

Income_Taxes_Income_Taxes_Reco

Income Taxes Income Taxes (Reconciliation Of Statutory Federal Income Tax Rate With Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]	'	'	'
U.S. federal statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	0.30%	0.50%	0.90%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	-17.90%	-17.40%	-16.00%
Effective Income Tax Rate Reconciliation, Tax Contingencies, Reserve	4.30%	4.90%	-5.70%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	1.90%	3.20%	-0.10%
Effective Income Tax Rate Reconciliation, Deductions, Qualified Production Activities	-0.50%	-3.40%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments	1.60%	-1.30%	2.20%
Effective Income Tax Rate, Continuing Operations	24.70%	21.50%	16.30%

Income_Taxes_Income_Taxes_Defe

Income Taxes Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Taxes [Abstract]	'	'
Deferred Tax Assets, Operating Loss Carryforwards	$9,596	$2,890
Deferred Tax Assets, Tax Credit Carryforwards	9,233	7,600
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	1,196	821
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	1,423	1,028
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	4,917	5,990
Deferred Tax Assets, Property, Plant and Equipment	1,266	0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses	161	355
Deferred Tax Assets, Gain On Sale Of Intangible Assets	123	137
Deferred Tax Assets, Deferred Income	812	270
Deferred Tax Assets, State Taxes	1,451	1,534
Deferred Tax Assets, Gross	30,178	20,625
Deferred Tax Assets, Valuation Allowance	-8,493	-5,918
Deferred Tax Assets, Net of Valuation Allowance	21,685	14,707
Deferred Tax Liabilities, Property, Plant and Equipment	0	-84
Deferred Tax Liabilities, Intangible Assets	-47,711	-38,864
Deferred Tax Liabilities, Prepaid Insurance	-369	-224
Deferred Tax Liabilities, Foreign Other	-6,359	-5,018
Deferred Tax Liabilities, Net	-54,439	-44,190
Deferred Tax Assets, Net	($32,754)	($29,483)

Income_Taxes_Income_Taxes_Reco1

Income Taxes Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]	'	'
Unrecognized Tax Benefits	$40,888	$35,421
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	-1,646	'
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	$7,113	'

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	0 Months Ended					12 Months Ended
	Feb. 12, 2014	Nov. 05, 2013	Aug. 07, 2013	7-May-13	Feb. 13, 2013	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]	'	'	'	'	'	'	'
Preferred Stock, Par or Stated Value Per Share	'	'	'	'	'	$0.01	$0.01
Preferred Stock, Value, Issued	'	'	'	'	'	$5,064,000	'
Stock Repurchased	'	'	'	'	'	'	2,100,000
Aggregate cost for repurchase of common stock	'	'	'	'	'	'	$58,600,000
Shares surrendered to pay exercise price or satisfy tax withholding obligations for stock options exercised/restricted stock	'	'	'	'	'	105,828	'
Dividend amount to be paid, per common share	$0.26	$0.26	$0.25	$0.24	$0.23	'	'
Dividend, declaration date	11-Feb-14	5-Nov-13	7-Aug-13	7-May-13	12-Feb-13	'	'
Dividend, date to be paid	10-Mar-14	4-Dec-13	3-Sep-13	4-Jun-13	4-Mar-13	'	'
Dividend, date of record	24-Feb-14	18-Nov-13	19-Aug-13	20-May-13	25-Feb-13	'	'
2012 Repurchase Program [Member]	'	'	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'	'	'
Maximum number of shares authorized to be repurchased	'	'	'	'	'	5,000,000	'

Stock_Options_And_Employee_Sto2

Stock Options And Employee Stock Purchase Plan (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Estimated forfeiture rate	14.44%	14.58%	14.88%	'
Allocated Share-based Compensation Expense	$9,720,000	$9,132,000	$8,993,000	'
Weighted-average grant date fair value of options granted	'	$7.92	$12.54	'
Number of options outstanding	1,175,657	1,765,461	2,087,695	3,794,394
Number of options granted	0	67,000	163,319	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	11,900,000	4,500,000	41,400,000	'
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vested In Period, Total Fair Value	3,100,000	4,700,000	4,600,000	'
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	13,600,000	5,600,000	7,100,000	'
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	3,900,000	1,600,000	14,200,000	'
Weighted-Average Exercise Price, Granted	$0	$27.26	$29.42	'
Weighted-Average Remaining Contractual Term, Outstanding (in years)	'4 years	'	'	'
Dividends, Share-based Compensation	68,000	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'4 years 0 months 11 days	'	'	'
Stock Options [Member]	'	'	'	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	2,000,000	'	'	'
Restricted Stock And Restricted Stock Unit (RSU) [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	6,400,000	4,300,000	3,200,000	'
Shares, Granted	729,137	390,210	130,212	'
Allocated Share-based Compensation Expense	7,100,000	5,200,000	3,900,000	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	20,200,000	'	'	'
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$1,400,000	$300,000	$300,000	'
Employee Stock Purchase Plan [Member]	'	'	'	'
Market value of common stock on the date of grant for incentive stock options	95.00%	'	'	'
Maximum issuance of common stock	2,000,000	'	'	'
Maximum earnings withheld by the employees	15.00%	'	'	'
Number of shares purchased under the plan	5,402	5,797	5,235	'
Number of shares available for issuance	1,640,199	'	'	'
Restricted Stock [Member]	'	'	'	'
Shares, Granted	690,762	'	'	'
Number of stocks outstanding	1,178,371	828,475	'	'
Weighted-Average Grant-Date Fair Value, Granted	$13.57	'	'	'
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Shares, Granted	38,375	91,166	'	'
Number of stocks outstanding	109,725	115,466	32,750	'
Nineteen Hundred Ninety Seven Stock Oprtion Plan [Member]	'	'	'	'
Additional shares authorized for issuance	840,000	'	'	'
Maximum issuance of common stock	12,000,000	'	'	'
2007 Stock Plan [Member]	'	'	'	'
Maximum issuance of common stock	4,500,000	'	'	'
Number of shares available for issuance	887,343	'	'	'
Nineteen Ninety Seven Stock Option Plan And Two Thousand Seven Stock Plan [Member]	'	'	'	'
Expiration period of options granted (in years)	10	'	'	'
Number of Shares, Exercisable	845,198	1,132,365	1,155,335	'
Weighted-Average Exercise Price, Exercisable	$20.35	$21.94	$19.80	'
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	'5 years	'	'	'
Weighted-Average Remaining Contractual Term, Outstanding (in years)	'4 years 0 months 11 days	'	'	'
Ziff Davis, Inc. 2012 Equity Incentive Plan [Member]	'	'	'	'
Shares, Granted	13,035,000	'	'	'
Maximum issuance of common stock	15,000,000	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	'5 years	'	'	'
Weighted-Average Grant-Date Fair Value, Granted	$0	'	'	'
Minimum [Member] | Employee Stock Purchase Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased	$30.23	'	'	'
Minimum [Member] | 2007 Stock Plan [Member]	'	'	'	'
Market value of common stock on the date of grant for incentive stock options	85.00%	'	'	'
Minimum [Member] | Nineteen Ninety Seven Stock Option Plan And Two Thousand Seven Stock Plan [Member]	'	'	'	'
Weighted-Average Exercise Price, Granted	$9.55	'	'	'
Maximum [Member] | Employee Stock Purchase Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased	$52.23	'	'	'
Maximum [Member] | Nineteen Ninety Seven Stock Option Plan And Two Thousand Seven Stock Plan [Member]	'	'	'	'
Weighted-Average Exercise Price, Granted	$34.73	'	'	'

Stock_Options_And_Employee_Sto3

Stock Options And Employee Stock Purchase Plan (Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Shares, Outstanding Beginning of Period	1,765,461	2,087,695	3,794,394
Number of options granted	0	67,000	163,319
Number of Shares, Exercised	569,204	357,234	1,820,678
Number of Shares, Canceled	20,600	32,000	49,340
Number of Shares, Outstanding Ending of Period	1,175,657	1,765,461	2,087,695
Number of Shares, Vested and expected to vest	1,132,886	'	'
Weighted-Average Exercise Price, Outstanding Beginning of Period	$22.08	$20.99	$14.40
Weighted-Average Exercise Price, Granted	$0	$27.26	$29.42
Weighted-Average Exercise Price, Exercised	$23.90	$15.81	$7.92
Weighted-Average Exercise Price, Canceled	$21.79	$31.34	$24.76
Weighted-Average Exercise Price, Outstanding Ending of Period	$21.21	$22.08	$20.99
Weighted-Average Exercise Price, Vested and expected to vest	$21.01	'	'
Weighted-Average Remaining Contractual Term, Outstanding (in years)	'4 years	'	'
Weighted-Average Remaining Contractual Term, Exercisable (in years)	'3 years 1 month 6 days	'	'
Weighted-Average Remaining Contractual Term, Vested and expected to vest (in years)	'3 years 10 months 24 days	'	'
Aggregate Intrinsic Value, Outstanding	$33,858,816	'	'
Aggregate Intrinsic Value, Exercisable	25,068,917	'	'
Aggregate Intrinsic Value, Vested and expected to vest	32,856,049	'	'
Aggregate intrinsic values of options exercised	11,900,000	4,500,000	41,400,000
Stock Options [Member]	'	'	'
Unrecognized compensation cost related to non-vested awards granted	$2,000,000	'	'
Weighted-average period to recognize compensation cost (in years)	'1 year 5 months 9 days	'	'

Stock_Options_And_Employee_Sto4

Stock Options And Employee Stock Purchase Plan Stock Options And Employee Stock Purchase Plan (Outstanding And Exercisable Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	1,175,657
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'4 years 0 months 11 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$21.21
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	845,198
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$20.35
Range One [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	200,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'0 years 2 months 23 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$9.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	200,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$9.55
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range	$9.55
Range Two [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	7,911
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'0 years 11 months 5 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$15.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	7,911
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$15.57
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range	$13.74
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$15.65
Range Three [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	150,420
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'5 years 2 months 5 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$17.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	43,280
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$17.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$17.19
Range Four [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	172,925
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'1 year 8 months 1 day
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$18.77
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	172,925
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$18.77
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range	$18.77
Range Five [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	157,504
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'4 years 10 months 10 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$21.21
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	130,152
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$21.15
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range	$20.15
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$21.67
Range Six [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	119,228
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'6 years 1 month 17 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$22.85
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	65,244
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$22.78
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$21.88
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$23.11
Range Seven [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	203,169
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'6 years 6 months 7 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$28.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	94,686
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$28.32
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$23.40
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$29.34
Range Eight [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	47,500
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'8 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$30.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	14,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$30.52
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$29.53
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$31.07
Range Nine [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	102,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'3 years 7 months 2 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$32.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	102,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$32.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$32.45
Range Ten [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	15,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	'3 years 6 months 22 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$34.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options	15,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$34.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$34.73

Stock_Options_And_Employee_Sto5

Stock Options And Employee Stock Purchase Plan (Assumptions To Estimate Fair Value Of Stock Options) (Details)	7 Months Ended	12 Months Ended
	Jul. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'	'
Estimated forfeiture rate	'	14.44%	14.58%	14.88%
Risk-free interest rate	'	'	1.10%	2.30%
Expected term (in years)	'	'	'5 years 8 months 23 days	'6 years 6 months
Dividend yield	0.00%	'	3.20%	2.60%
Expected volatility	'	'	41.60%	41.80%

Stock_Options_And_Employee_Sto6

Stock Options And Employee Stock Purchase Plan (Allocation Of Share-Based Compensation Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allocated Share-based Compensation Expense	$9,720	$9,132	$8,993
Cost Of Revenues [Member]	'	'	'
Allocated Share-based Compensation Expense	756	844	982
Sales And Marketing [Member]	'	'	'
Allocated Share-based Compensation Expense	1,855	1,543	1,431
Research, Development And Engineering [Member]	'	'	'
Allocated Share-based Compensation Expense	434	459	477
General And Administrative [Member]	'	'	'
Allocated Share-based Compensation Expense	$6,675	$6,286	$6,103

Stock_Options_And_Employee_Sto7

Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation cost recognized	$9,720,000	$9,132,000	$8,993,000
Allocated Share-based Compensation Expense	9,720,000	9,132,000	8,993,000
Restricted Stock And Restricted Stock Unit (RSU) [Member]	'	'	'
Compensation cost recognized	7,100,000	5,200,000	3,900,000
Allocated Share-based Compensation Expense	7,100,000	5,200,000	3,900,000
Shares, Granted	729,137	390,210	130,212
Unrecognized compensation cost related to non-vested awards granted	20,200,000	'	'
Restricted Stock [Member]	'	'	'
Shares, Nonvested at January 1, 2013	828,475	'	'
Shares, Granted	690,762	'	'
Shares, Vested	-296,966	'	'
Shares, Canceled	-43,900	'	'
Shares, Nonvested at December 31, 2013	1,178,371	'	'
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2013	$23.08	'	'
Weighted-Average Grant-Date Fair Value, Granted	$13.57	'	'
Weighted-Average Grant-Date Fair Value, Vested	$21.46	'	'
Weighted-Average Grant-Date Fair Value, Canceled	$24.46	'	'
Weighted-Average Grant-Date Fair Value, Nonvested at December 31, 2013	$17.86	'	'
Weighted-average period to recognize compensation cost (in years)	'3 years 0 months 4 days	'	'
Restricted Stock Units (RSUs) [Member]	'	'	'
Shares, Nonvested at January 1, 2013	115,466	32,750	'
Shares, Granted	38,375	91,166	'
Shares, Vested	-11,116	1,700	'
Shares, Canceled	-33,000	6,750	'
Shares, Nonvested at December 31, 2013	109,725	115,466	'
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares	74,509	'	'
Weighted-average period to recognize compensation cost (in years)	'3 years 7 months 21 days	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	'2 years 2 months 9 days	'	'
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term	'1 year 11 months 5 days	'	'
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value	3,726,174	'	'
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value	$5,487,347	'	'

Defined_Contribution_401k_Savi1

Defined Contribution 401(k) Savings Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution 401(k) Savings Plan [Abstract]	'	'
Defined Contribution Plan, Cost Recognized	$0.10	$0.10

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Reconciliation [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net earnings attributable to j2 Global, Inc. common shareholders	$20,754	$27,806	$36,040	$22,922	$30,203	$31,650	$31,188	$28,539	$107,522	$121,580	$114,766
Net earnings available to participating securities	'	'	'	'	'	'	'	'	-2,105	-2,075	-1,932
Net earnings available to common shareholders	'	'	'	'	'	'	'	'	$105,417	$119,505	$112,834
Basic	45,867,769	45,729,171	45,428,230	45,160,140	45,071,204	45,002,565	45,373,930	46,400,441	45,548,767	45,459,712	45,799,615
Dilutive effect of equity incentive plans	'	'	'	'	'	'	'	'	591,252	321,946	585,233
Diluted	46,382,363	46,291,631	46,018,245	45,668,167	45,423,502	45,340,111	45,569,564	46,794,603	46,140,019	45,781,658	46,384,848
Basic	$0.45	$0.60	$0.78	$0.50	$0.66	$0.69	$0.68	$0.61	$2.31	$2.63	$2.46
Diluted	$0.44	$0.59	$0.77	$0.49	$0.65	$0.69	$0.67	$0.60	$2.28	$2.61	$2.43
Share options excluded from the computation of diluted earnings per share	'	'	'	'	'	'	'	'	0	527,319	421,319

Segment_Information_Details

Segment Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$520,801	$371,396	$330,159
United States	221,922	152,103	'
Total long-lived assets	221,922	152,103	'
Remaining Service Obligations To eFax Customers [Member]	'	'	'
Revenues	'	'	10,300
UNITED STATES	'	'	'
Revenues	369,507	233,585	203,153
United States	170,247	105,549	'
Total long-lived assets	170,247	105,549	'
CANADA	'	'	'
Revenues	73,130	79,656	83,066
IRELAND	'	'	'
Revenues	41,398	41,248	42,652
All Other Countries [Member]	'	'	'
Revenues	36,766	16,907	1,288
United States	51,675	46,554	'
Total long-lived assets	$51,675	$46,554	'

Segment_Information_Reportable

Segment Information Reportable Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'
Revenues	$520,801	$371,396	$330,159
Direct Costs By Segment	315,582	181,147	165,833
Operating Income (Loss)	175,423	162,162	135,950
Global Operating Costs	30,245	28,087	28,376
Business Cloud Services Segment [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Revenues	390,104	361,684	330,159
Direct Costs By Segment	191,169	174,324	165,833
Operating Income (Loss)	'	187,360	164,326
Digital Media Segment [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Revenues	131,146	9,712	0
Direct Costs By Segment	124,413	6,823	0
Operating Income (Loss)	'	2,889	0
Intersegment Eliminations [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Revenues	-449	0	0
Operating Segments [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Operating Income (Loss)	$205,668	$190,249	$164,326

Segment_Information_Reportable1

Segment Information Reportable Segment Information (Total Assets, Capital Expenditures, Depreciation And Amortization) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Other Significant Reconciling Item [Line Items]	'	'	'
Assets	$1,153,789	$995,170	'
Payments to Acquire Property, Plant, and Equipment	18,627	5,061	6,844
Property, Plant and Equipment, Additions	18,626	5,061	6,844
Depreciation, Depletion and Amortization, Nonproduction	39,788	22,152	19,757
Business Cloud Services Segment [Member]	'	'	'
Segment Reporting, Other Significant Reconciling Item [Line Items]	'	'	'
Assets	818,722	788,828	'
Payments to Acquire Property, Plant, and Equipment	10,979	4,240	6,320
Depreciation, Depletion and Amortization, Nonproduction	24,148	20,473	19,342
Digital Media Segment [Member]	'	'	'
Segment Reporting, Other Significant Reconciling Item [Line Items]	'	'	'
Assets	333,286	204,244	'
Payments to Acquire Property, Plant, and Equipment	6,635	380	0
Depreciation, Depletion and Amortization, Nonproduction	14,963	1,167	0
Operating Segments [Member]	'	'	'
Segment Reporting, Other Significant Reconciling Item [Line Items]	'	'	'
Assets	1,152,008	993,072	'
Payments to Acquire Property, Plant, and Equipment	17,614	4,620	6,320
Depreciation, Depletion and Amortization, Nonproduction	39,111	21,640	19,342
Corporate [Member]	'	'	'
Segment Reporting, Other Significant Reconciling Item [Line Items]	'	'	'
Assets	1,781	2,098	'
Payments to Acquire Property, Plant, and Equipment	1,012	441	524
Depreciation, Depletion and Amortization, Nonproduction	$677	$512	$415

Related_Party_Transactions_Det

Related Party Transactions (Details) (Lease And Expense Reimbursement [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Lease And Expense Reimbursement [Member]	'	'	'
Related Party Transaction [Line Items]	'	'	'
Related Party Transaction, Amounts of Transaction	$0	$0	$1.20

Supplemental_Cash_Flows_Inform1

Supplemental Cash Flows Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flows Information [Abstract]	'	'	'
Cash paid for income taxes	$28,300,000	$20,400,000	$13,500,000
Capital Expenditures Incurred but Not yet Paid	900,000	600,000	800,000
Tax Benefit from Stock Options Exercised	7,100,000	3,300,000	15,800,000
Interest Paid	21,100,000	400,000	100,000
Business Combination, Contingent Consideration, Liability	7,000,000	2,500,000	1,000,000
Loss on extinguishment of debt and related interest expense	$14,437,000	$0	$0

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income Roll Forward (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) Roll Forward [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$6,056	$1,811	'
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	-1,821	-1,899	-800
Accumulated Other Comprehensive Income (Loss), Net of Tax	4,235	-88	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	4,245	1,954	-602
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	-10	'	'
Other Comprehensive Income Loss Arising During Period Total Net of Tax	4,226	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	9	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	88	'	'
Other Comprehensive Income Loss Reclassification Adjustments Total Net of Tax	97	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	4,236	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	78	1,435	-840
Other Comprehensive Income (Loss), Net of Tax	$4,323	$3,389	($1,442)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income [Abstract]	'	'	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$4,236	'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	4,245	1,954	-602
ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock [Line Items]	'	'	'
Other expense (income), net	11,472	-410	-537
Income tax expense	35,175	33,259	22,350
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	88	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	9	'	'
Accumulated Translation Adjustment [Member]	'	'	'
ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock [Line Items]	'	'	'
Other expense (income), net	116	'	'
Income tax expense	-28	'	'
Accumulated Net Unrealized Investment Gain (Loss) [Member]	'	'	'
ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock [Line Items]	'	'	'
Other expense (income), net	14	'	'
Income tax expense	($5)	'	'

Quarterly_Results_Details

Quarterly Results (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Results [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Revenue, Net	$138,035	$127,788	$141,361	$113,617	$102,033	$93,246	$89,465	$86,652	'	'	'
Gross Profit	115,857	105,987	118,682	93,382	83,375	76,943	73,278	70,788	433,908	304,383	269,546
Net earnings attributable to j2 Global, Inc. common shareholders	$20,754	$27,806	$36,040	$22,922	$30,203	$31,650	$31,188	$28,539	$107,522	$121,580	$114,766
Basic	$0.45	$0.60	$0.78	$0.50	$0.66	$0.69	$0.68	$0.61	$2.31	$2.63	$2.46
Diluted	$0.44	$0.59	$0.77	$0.49	$0.65	$0.69	$0.67	$0.60	$2.28	$2.61	$2.43
Basic	45,867,769	45,729,171	45,428,230	45,160,140	45,071,204	45,002,565	45,373,930	46,400,441	45,548,767	45,459,712	45,799,615
Diluted	46,382,363	46,291,631	46,018,245	45,668,167	45,423,502	45,340,111	45,569,564	46,794,603	46,140,019	45,781,658	46,384,848

Unrestricted_Subsidiaries_Unre

Unrestricted Subsidiaries Unrestricted Subsidiaries (Financial Position) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Cash and cash equivalents	$207,801	$218,680	$139,359	$64,752
Accounts Receivable, Net	67,245	37,285	'	'
Prepaid expenses and other current assets	20,064	15,388	'	'
Deferred income taxes	3,126	1,092	'	'
Assets, Current	389,025	377,499	'	'
Property and equipment, net	31,200	19,599	'	'
Tradenames, net	83,108	71,409	'	'
Customer Relationships, Net	100,980	64,723	'	'
Goodwill	457,422	407,825	279,016	'
Other purchased intangibles, net	10,915	9,855	'	'
Deferred income taxes	1,845	1,852	'	'
Other assets	3,413	3,238	'	'
Assets	1,153,789	995,170	'	'
Accounts payable and accrued expenses	69,570	39,874	'	'
Income taxes payable	1,569	3,037	'	'
Deferred revenue	36,326	30,493	'	'
Deferred Tax Liabilities, Net, Current	1,892	0	'	'
Liabilities, Current	114,892	78,927	'	'
Deferred income taxes	35,833	32,393	'	'
Mandatorily redeemable financial instrument	0	8,740	'	'
Liabilities	447,371	400,575	'	'
Commitments and contingencies	0	0	'	'
Common Stock, Value, Issued	461	451	'	'
Additional paid-in capital	216,872	169,542	'	'
Retained earnings	484,850	424,790	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax	4,235	-88	'	'
Stockholders' equity attributable to j2 Global, Inc.	706,418	594,695	554,375	431,745
Stockholders' Equity Attributable to Noncontrolling Interest	0	-100	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	706,418	594,595	554,375	431,745
Liabilities and Equity	1,153,789	995,170	'	'
Ziff Davis, Inc [Member]	'	'	'	'
Cash and cash equivalents	16,506	'	'	'
Accounts Receivable, Net	47,804	'	'	'
Prepaid expenses and other current assets	3,090	'	'	'
Deferred income taxes	2,704	'	'	'
Assets, Current	70,104	'	'	'
Property and equipment, net	13,358	'	'	'
Tradenames, net	49,701	'	'	'
Customer Relationships, Net	53,169	'	'	'
Goodwill	140,740	'	'	'
Other purchased intangibles, net	3,208	'	'	'
Deferred income taxes	1,463	'	'	'
Other assets	1,543	'	'	'
Assets	333,286	'	'	'
Accounts payable and accrued expenses	23,087	'	'	'
Income taxes payable	3,294	'	'	'
Deferred revenue	2,743	'	'	'
Deferred Tax Liabilities, Net, Current	679	'	'	'
Liabilities, Current	29,803	'	'	'
Deferred income taxes	21,696	'	'	'
Liabilities	51,499	'	'	'
Additional paid-in capital	297,390	'	'	'
Retained earnings	-15,366	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax	-237	'	'	'
Stockholders' equity attributable to j2 Global, Inc.	281,787	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	281,787	'	'	'
Liabilities and Equity	$333,286	'	'	'

Unrestricted_Subsidiaries_Unre1

Unrestricted Subsidiaries Unrestricted Subsidiaries (Results of Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	'	'	'	'	'	'	'	'	$520,801	$371,396	$330,159
Cost of revenues	'	'	'	'	'	'	'	'	86,893	67,013	60,613
Gross Profit	115,857	105,987	118,682	93,382	83,375	76,943	73,278	70,788	433,908	304,383	269,546
Selling and Marketing Expense	'	'	'	'	'	'	'	'	131,317	62,825	59,066
Research and Development Expense	'	'	'	'	'	'	'	'	25,485	18,624	16,373
General and Administrative Expense	'	'	'	'	'	'	'	'	101,683	60,772	58,157
Operating Expenses	'	'	'	'	'	'	'	'	258,485	142,221	133,596
Operating Income (Loss)	'	'	'	'	'	'	'	'	175,423	162,162	135,950
Interest expense (income), net	'	'	'	'	'	'	'	'	21,254	7,650	-629
Other expense (income), net	'	'	'	'	'	'	'	'	11,472	-410	-537
Income before income taxes	'	'	'	'	'	'	'	'	142,697	154,922	137,116
Income tax expense	'	'	'	'	'	'	'	'	35,175	33,259	22,350
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	107,522	121,663	114,766
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	0	83	0
Net earnings attributable to j2 Global, Inc. common shareholders	20,754	27,806	36,040	22,922	30,203	31,650	31,188	28,539	107,522	121,580	114,766
Ziff Davis, Inc [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	131,146	'	'
Cost of revenues	'	'	'	'	'	'	'	'	16,982	'	'
Gross Profit	'	'	'	'	'	'	'	'	114,164	'	'
Selling and Marketing Expense	'	'	'	'	'	'	'	'	64,923	'	'
Research and Development Expense	'	'	'	'	'	'	'	'	5,427	'	'
General and Administrative Expense	'	'	'	'	'	'	'	'	37,082	'	'
Operating Expenses	'	'	'	'	'	'	'	'	107,432	'	'
Operating Income (Loss)	'	'	'	'	'	'	'	'	6,732	'	'
Interest expense (income), net	'	'	'	'	'	'	'	'	11,215	'	'
Other expense (income), net	'	'	'	'	'	'	'	'	12,229	'	'
Income before income taxes	'	'	'	'	'	'	'	'	-16,712	'	'
Income tax expense	'	'	'	'	'	'	'	'	-265	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	-16,447	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	0	'	'
Net earnings attributable to j2 Global, Inc. common shareholders	'	'	'	'	'	'	'	'	($16,447)	'	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	0 Months Ended
	Feb. 12, 2014	Nov. 05, 2013	Aug. 07, 2013	7-May-13	Feb. 13, 2013
Subsequent Events [Abstract]	'	'	'	'	'
Dividends declared date	11-Feb-14	5-Nov-13	7-Aug-13	7-May-13	12-Feb-13
Dividend amount to be paid, per common share	$0.26	$0.26	$0.25	$0.24	$0.23
Date dividend is payable	10-Mar-14	4-Dec-13	3-Sep-13	4-Jun-13	4-Mar-13
Date shareholders must be on record for dividend	24-Feb-14	18-Nov-13	19-Aug-13	20-May-13	25-Feb-13