Goodwill (Changes in Goodwill) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 17,375	$ 16,908	$ 16,955
Goodwill [Roll Forward]
Balance, beginning of year, Goodwill, gross	327,561	327,608
Balance, beginning of year, Accumulated impairment lossses	(310,653)	(310,653)
Effects of foreign currency translation	467	(47)
Total goodwill increase (decrease)	467	(47)
Balance, end of year, Goodwill, Net	17,375	16,908
Consumer Media
Goodwill [Line Items]
Goodwill	580	580
Goodwill [Roll Forward]
Balance, end of year, Goodwill, Net	580	580
Mobile Services
Goodwill [Line Items]
Goodwill	2,188	2,074
Goodwill [Roll Forward]
Balance, end of year, Goodwill, Net	2,188	2,074
Games
Goodwill [Line Items]
Goodwill	14,607	14,254
Goodwill [Roll Forward]
Balance, end of year, Goodwill, Net	$ 14,607	$ 14,254