Unrestricted Subsidiaries Unrestricted Subsidiaries (Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2010
Cash and cash equivalents	$ 199,181		$ 218,680	$ 287,514	$ 139,359
Accounts receivable	64,279		37,285
Prepaid expenses and other current assets	22,779		15,388
Deferred income taxes	2,729		1,092
Assets, Current	397,011		377,499
Property and equipment, net	30,143		19,599
Tradenames, net	84,419		71,409
Customer Relationships, Net	84,023		64,723
Goodwill	441,687		407,825
Other purchased intangibles, net	9,666		9,855
Deferred income taxes	2,130		1,852
Other assets	3,409		3,238
Assets	1,138,090		995,170
Accounts payable and accrued expenses	68,430		39,874
Income taxes payable	1,736		3,004
Deferred revenue, current	35,675		30,493
Liabilities, Current	116,474		78,927
Deferred income taxes	41,635		32,393
Other long-term liabilities	1,787		1,557
Mandatorily redeemable financial instrument	9,760		8,740
Liabilities	463,255		400,575
Commitments and contingencies	0		0
Common Stock, Value, Issued	459		451
Additional paid-in capital	191,287		169,542
Retained Earnings (Accumulated Deficit)	475,979		424,790
Accumulated Other Comprehensive Income (Loss), Net of Tax	8,646	2,797	(88)
Stockholders' Equity Attributable to Parent	676,371		594,695
Liabilities and Equity	1,138,090		995,170
Ziff Davis, Inc [Member]
Cash and cash equivalents	14,910
Accounts receivable	45,773
Prepaid expenses and other current assets	4,599
Deferred income taxes	3,197
Assets, Current	68,479
Property and equipment, net	12,777
Tradenames, net	50,620
Customer Relationships, Net	39,658
Goodwill	131,877
Other purchased intangibles, net	1,828
Deferred income taxes	0
Other assets	1,511
Assets	306,750
Accounts payable and accrued expenses	30,268
Income taxes payable	1,578
Deferred revenue, current	2,294
Liabilities, Current	34,140
Notes Payable, Related Parties, Noncurrent	67,500
Interest Payable, Noncurrent	6,351
Deferred income taxes	30,550
Other long-term liabilities	16
Mandatorily redeemable financial instrument	199,611
Liabilities	338,168
Commitments and contingencies	0
Common Stock, Value, Issued	0
Additional paid-in capital	(25,064)
Retained Earnings (Accumulated Deficit)	(6,325)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29)
Stockholders' Equity Attributable to Parent	(31,418)
Liabilities and Equity	$ 306,750