Segment Information (Revenue by Geographic Region) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Geographic Reporting Disclosure [Line Items]
Revenue	$ 50,595	$ 48,958	$ 49,850	[1]	$ 56,793	$ 67,264	[2]	$ 59,088	$ 65,526	[1]	$ 66,964	$ 206,196	[3]	$ 258,842	[3]	$ 335,686	[3]
United States
Geographic Reporting Disclosure [Line Items]
Revenue												90,250		117,844		162,720
Europe
Geographic Reporting Disclosure [Line Items]
Revenue												38,155		56,473		74,602
Republic of Korea
Geographic Reporting Disclosure [Line Items]
Revenue												46,601		40,467		44,261
Rest of World
Geographic Reporting Disclosure [Line Items]
Revenue												$ 31,190		$ 44,058		$ 54,103

[1] In the quarter ended June 30, 2012, we recognized a net gain of $117.9 million from the sale to Intel of certain patents, patent applications, and related rights. The net gain for the full year 2012 totaled $116.4 million. See Note 1, Description of Business and Summary of Significant Accounting Policies, for additional details.

[2] In the quarter ended December 31, 2013, we sold our remaining shares of common stock in LoEn Entertainment for a net gain of $21.4 million, as described in further detail in Note 5.

[3] December 31, 2012 December 31, 2011 December 31, 2010Components of Cost of Revenue License Fees8,538 11,689 17,794Service Revenue70,553 92,042 108,843Net Revenue Costs79,091 103,731 126,637