Summary financial information for Digital Cinema Implementation Partners Limited Liability Company (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 Digital Cinema Implementation Partners LLC
Schedule of Equity Method Investments [Line Items]
Revenues			$ 166,017
Operating income	65,629	89,488	102,663
Net income	$ 33,062	$ 42,876	$ 36,752