Condensed Consolidating Financials Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 330,743		$ 123,950
Restricted Cash	265,000		0
Short-term investments	65		60
Accounts receivable, net of allowances of $9,027 and $7,988, respectively	181,528		199,871
Prepaid expenses and other current assets	22,354		24,118
Current assets held for sale	5,770		0
Due from Affiliate, Current	0		0
Total current assets	805,460		347,999
Property and equipment, net	71,173		68,094
Trade names, net	110,444		115,853
Patent and patent licenses, net	11,908		13,928
Customer Relationships, Net	193,180		208,155
Goodwill	1,139,426		1,122,810
Other purchased intangibles, net	152,553		173,755
Investments in and Advances to Affiliates, Amount of Equity	0		0
Deferred tax assets, non-current	7,228		5,289
Other assets	6,569		6,445
Non-current assets held for sale	29,720		0
Total assets	2,527,661		2,062,328
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	135,473		178,071
Income taxes payable	12,845		16,753
Deferred revenue, current	88,153		80,384
Line of credit	0		178,817
Current maturities of long-term debt	246,652		0
Other current liabilities	24		64
Current liabilities held for sale	523		0
Due to Affiliate, Current	0		0
Total current liabilities	483,670		454,089
Long-term debt	996,377		601,746
Deferred revenue, non-current	57		1,588
Liability for uncertain tax positions	46,988		46,537
Deferred income taxes, non-current	34,764		40,357
Other long-term liabilities	5,143		3,475
Non-current liabilities held for sale	5,103		0
Total liabilities	1,572,102		1,147,792
Commitments and contingencies	0		0
Common Stock, Value, Issued	476		474
Additional paid-in capital	314,790		308,329
Retained earnings (accumulated deficit)	679,029		660,382
Accumulated Other Comprehensive Income (Loss), Net of Tax	(38,736)	$ (51,067)	(54,649)
Stockholders' Equity Attributable to Parent	955,559		914,536
Total liabilities and stockholders’ equity	2,527,661		2,062,328
Series A Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS’ EQUITY
Preferred stock, $0.01 par value	0		0
j2 Global, Inc. [Member]
ASSETS
Cash and cash equivalents	4,248		23,935
Restricted Cash	0
Short-term investments	0		0
Accounts receivable, net of allowances of $9,027 and $7,988, respectively	0		0
Prepaid expenses and other current assets	41,434		25,922
Current assets held for sale	0
Due from Affiliate, Current	687,229		635,740
Total current assets	732,911		685,597
Property and equipment, net	0		0
Trade names, net	0		0
Patent and patent licenses, net	0		0
Customer Relationships, Net	0		0
Goodwill	0		0
Other purchased intangibles, net	0		0
Investments in and Advances to Affiliates, Amount of Equity	1,167,712		1,091,412
Deferred tax assets, non-current	0		1,346
Other assets	0		0
Non-current assets held for sale	0
Total assets	1,900,623		1,778,355
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	5,567		4,545
Income taxes payable	0		0
Deferred revenue, current	0		0
Line of credit			178,817
Current maturities of long-term debt	0
Other current liabilities	0		0
Current liabilities held for sale	0
Due to Affiliate, Current	547,092		296,658
Total current liabilities	552,659		480,020
Long-term debt	359,820		355,143
Deferred revenue, non-current	0		0
Liability for uncertain tax positions	0		0
Deferred income taxes, non-current	32,515		28,687
Other long-term liabilities	1,141		1,040
Non-current liabilities held for sale	0
Total liabilities	946,135		864,890
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	476		474
Additional paid-in capital	470,681		464,220
Retained earnings (accumulated deficit)	483,331		448,771
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Stockholders' Equity Attributable to Parent	954,488		913,465
Total liabilities and stockholders’ equity	1,900,623		1,778,355
j2 Cloud Services, LLC [Member]
ASSETS
Cash and cash equivalents	169,330		22,949
Restricted Cash	265,000
Short-term investments	0		0
Accounts receivable, net of allowances of $9,027 and $7,988, respectively	11,678		11,464
Prepaid expenses and other current assets	1,682		2,266
Current assets held for sale	0
Due from Affiliate, Current	530,478		281,078
Total current assets	978,168		317,757
Property and equipment, net	5,715		6,318
Trade names, net	10,767		10,097
Patent and patent licenses, net	534		601
Customer Relationships, Net	17,491		2,519
Goodwill	83,298		58,310
Other purchased intangibles, net	7,114		4,804
Investments in and Advances to Affiliates, Amount of Equity	803,353		730,153
Deferred tax assets, non-current	22,933		26,667
Other assets	435		443
Non-current assets held for sale	0
Total assets	1,929,808		1,157,669
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	42,227		28,179
Income taxes payable	101,314		82,795
Deferred revenue, current	20,966		19,277
Line of credit			0
Current maturities of long-term debt	246,652
Other current liabilities	0		0
Current liabilities held for sale	0
Due to Affiliate, Current	0		11
Total current liabilities	411,159		130,262
Long-term debt	636,557		246,604
Deferred revenue, non-current	57		1,588
Liability for uncertain tax positions	40,254		41,259
Deferred income taxes, non-current	0		0
Other long-term liabilities	1,972		505
Non-current liabilities held for sale	0
Total liabilities	1,089,999		420,218
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	0		0
Additional paid-in capital	89,066		89,066
Retained earnings (accumulated deficit)	750,667		648,233
Accumulated Other Comprehensive Income (Loss), Net of Tax	76		152
Stockholders' Equity Attributable to Parent	839,809		737,451
Total liabilities and stockholders’ equity	1,929,808		1,157,669
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	157,165		77,066
Restricted Cash	0
Short-term investments	65		60
Accounts receivable, net of allowances of $9,027 and $7,988, respectively	169,996		188,498
Prepaid expenses and other current assets	21,082		21,246
Current assets held for sale	5,770
Due from Affiliate, Current	157,243		166,210
Total current assets	511,321		453,080
Property and equipment, net	65,458		61,776
Trade names, net	99,677		105,756
Patent and patent licenses, net	11,374		13,327
Customer Relationships, Net	175,689		205,636
Goodwill	1,056,128		1,064,500
Other purchased intangibles, net	145,439		168,951
Investments in and Advances to Affiliates, Amount of Equity	(1,071)		(1,071)
Deferred tax assets, non-current	3,391		2,171
Other assets	6,134		6,002
Non-current assets held for sale	29,720
Total assets	2,103,260		2,080,128
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	129,669		170,754
Income taxes payable	39		0
Deferred revenue, current	67,187		61,107
Line of credit			0
Current maturities of long-term debt	0
Other current liabilities	24		64
Current liabilities held for sale	523
Due to Affiliate, Current	739,350		720,317
Total current liabilities	936,792		952,242
Long-term debt	0		(1)
Deferred revenue, non-current	0		0
Liability for uncertain tax positions	6,734		5,278
Deferred income taxes, non-current	21,345		36,565
Other long-term liabilities	2,030		1,930
Non-current liabilities held for sale	5,103
Total liabilities	972,004		996,014
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	0		0
Additional paid-in capital	424,399		424,399
Retained earnings (accumulated deficit)	745,669		714,516
Accumulated Other Comprehensive Income (Loss), Net of Tax	(38,812)		(54,801)
Stockholders' Equity Attributable to Parent	1,131,256		1,084,114
Total liabilities and stockholders’ equity	2,103,260		2,080,128
Consolidation, Eliminations [Member]
ASSETS
Cash and cash equivalents	0		0
Restricted Cash	0
Short-term investments	0		0
Accounts receivable, net of allowances of $9,027 and $7,988, respectively	(146)		(91)
Prepaid expenses and other current assets	(41,844)		(25,316)
Current assets held for sale	0
Due from Affiliate, Current	(1,374,950)		(1,083,028)
Total current assets	(1,416,940)		(1,108,435)
Property and equipment, net	0		0
Trade names, net	0		0
Patent and patent licenses, net	0		0
Customer Relationships, Net	0		0
Goodwill	0		0
Other purchased intangibles, net	0		0
Investments in and Advances to Affiliates, Amount of Equity	(1,969,994)		(1,820,494)
Deferred tax assets, non-current	(19,096)		(24,895)
Other assets	0		0
Non-current assets held for sale	0
Total assets	(3,406,030)		(2,953,824)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	(41,990)		(25,407)
Income taxes payable	(88,508)		(66,042)
Deferred revenue, current	0		0
Line of credit			0
Current maturities of long-term debt	0
Other current liabilities	0		0
Current liabilities held for sale	0
Due to Affiliate, Current	(1,286,442)		(1,016,986)
Total current liabilities	(1,416,940)		(1,108,435)
Long-term debt	0		0
Deferred revenue, non-current	0		0
Liability for uncertain tax positions	0		0
Deferred income taxes, non-current	(19,096)		(24,895)
Other long-term liabilities	0		0
Non-current liabilities held for sale	0
Total liabilities	(1,436,036)		(1,133,330)
Commitments and contingencies	0		0
Preferred stock, $0.01 par value	0		0
Common Stock, Value, Issued	0		0
Additional paid-in capital	(669,356)		(669,356)
Retained earnings (accumulated deficit)	(1,300,638)		(1,151,138)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Stockholders' Equity Attributable to Parent	(1,969,994)		(1,820,494)
Total liabilities and stockholders’ equity	$ (3,406,030)		$ (2,953,824)