Unrestricted Subsidiaries Unrestricted Subsidiaries (Results of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Total revenues	$ 113,617	$ 86,652
Cost of Goods Sold, Subscription	20,235	15,864
Gross Profit	93,382	70,788
Selling and Marketing Expense	29,638	14,860
Research and Development Expense	6,746	4,489
General and Administrative Expense	24,011	13,829
Operating Expenses	60,395	33,178
Operating Income (Loss)	32,987	37,610
Interest and other income (expense), net	(4,716)	(719)
Income before income taxes	28,271	36,891
Income Tax Expense (Benefit)	5,500	8,352
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	22,771	28,539
Ziff Davis, Inc [Member]
Total revenues	22,907
Cost of Goods Sold, Subscription	3,593
Gross Profit	19,314
Selling and Marketing Expense	12,787
Research and Development Expense	1,978
General and Administrative Expense	8,545
Operating Expenses	23,310
Operating Income (Loss)	(3,996)
Interest and other income (expense), net	(1,419)
Income before income taxes	(5,415)
Income Tax Expense (Benefit)	(2,332)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (3,083)