Changes in Accumulated Other Comprehensive Loss, Net of Taxes, Related to Investment in RealD (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances			$ 457	$ 2,499
Other comprehensive income (loss), net of taxes of $374 and $1,933	(2,603)	(5,256)	641	(3,215)
Ending balances	$ 1,098	$ (716)	$ 1,098	$ (716)