Description of Business and Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	0 Months Ended			3 Months Ended		12 Months Ended
	Jan. 26, 2012	Aug. 23, 2011	Jul. 27, 2011	Jun. 30, 2012	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
2012 Sale of Patents and Other Technology Assets to Intel Corporation
Sale of patents and other technology assets	$ 120,000,000
Net gain on sale of other investments				117,900,000			116,400,000
2011 Special Dividend and Reverse Stock Split
Special cash dividend, declared			$ 1.00
Payment of special dividend		136,800,000				0	0	136,793,000
Reverse stock split, conversion ratio		0.25
Depreciation and Amortization
Depreciation expense						14,300,000	12,900,000	12,800,000
Deferred Costs
Impairment of ongoing project, deferred costs					16,700,000
Impairment of ongoing project, equipment and software assets					3,300,000
Impairment of deferred costs					20,000,000
Advertising Expense
Advertising expense						$ 30,600,000	$ 31,700,000	$ 35,700,000
Other Intangible Assets | Minimum
Other Intangible Assets
Intangible asset, useful life						1 year
Other Intangible Assets | Maximum
Other Intangible Assets
Intangible asset, useful life						11 years
Equipment and Software | Minimum
Depreciation and Amortization
Useful life						3 years
Equipment and Software | Maximum
Depreciation and Amortization
Useful life						5 years