Investment in National CineMedia - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity income/loss from NCM	$ 866	$ 716
Number of additional common units of NCM received under common unit adjustment agreement	588,024
Investment in NCM - receipt of common units	$ 8,869	$ 9,137
Remaining term of Exhibitor Services Agreement	23 years
Total number of common units of NCM owned by Company	18,682,668
Interest on common units of NCM owned by Company	16.00%