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	$ 0.00	$ 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	$ 0.00
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