Unrestricted Subsidiaries Unrestricted Subsidiaries (Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2010
Cash and cash equivalents	$ 193,126	$ 218,680	$ 135,682	$ 139,359
Accounts receivable	56,164	37,285
Prepaid expenses and other current assets	15,891	15,388
Deferred income taxes	2,438	1,092
Assets, Current	368,465	377,499
Property and equipment, net	24,874	19,599
Tradenames, net	85,060	71,409
Customer Relationships, Net	80,761	64,723
Goodwill	429,293	407,825
Other purchased intangibles, net	11,284	9,855
Deferred income taxes	2,165	1,852
Other assets	3,266	3,238
Assets	1,039,826	995,170
Accounts payable and accrued expenses	57,122	39,874
Deferred revenue	32,753	30,493
Liabilities, Current	99,791	78,927
Deferred income taxes	39,163	32,393
Other long-term liabilities	3,001	3,166
Mandatorily redeemable financial instrument	9,068	8,740
Liabilities	429,772	400,575
Commitments and contingencies	0	0
Common Stock, Value, Issued	453	451
Additional paid-in capital	173,231	169,542
Retained Earnings (Accumulated Deficit)	435,976	424,790
Accumulated Other Comprehensive Income (Loss), Net of Tax	980	(88)
Stockholders' Equity Attributable to Parent	610,640	594,695
Liabilities and Equity	1,039,826	995,170
Ziff Davis, Inc [Member]
Cash and cash equivalents	17,140
Accounts receivable	36,424
Prepaid expenses and other current assets	3,548
Deferred income taxes	3,197
Assets, Current	60,309
Property and equipment, net	10,153
Tradenames, net	50,365
Customer Relationships, Net	36,871
Goodwill	125,926
Other purchased intangibles, net	2,970
Deferred income taxes	114
Other assets	1,192
Assets	287,900
Accounts payable and accrued expenses	25,418
Deferred revenue	2,884
Liabilities, Current	28,302
Notes Payable, Related Parties, Noncurrent	54,000
Interest Payable, Noncurrent	1,350
Deferred income taxes	30,610
Other long-term liabilities	140
Mandatorily redeemable financial instrument	185,442
Liabilities	299,844
Commitments and contingencies	0
Common Stock, Value, Issued	0
Additional paid-in capital	(10,690)
Retained Earnings (Accumulated Deficit)	(1,327)
Accumulated Other Comprehensive Income (Loss), Net of Tax	73
Stockholders' Equity Attributable to Parent	(11,944)
Liabilities and Equity	$ 287,900