Investment in National CineMedia - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]
Equity income/loss from NCM			$ 1,402	$ (181)
Number of additional common units of NCM received under common unit adjustment agreement	5,315,837	588,024
Investment in NCM - receipt of common units	$ 89,928	$ 8,869	$ 98,797	$ 9,137
Remaining term of Exhibitor Services Agreement	23 years	23 years
Total number of common units of NCM owned by Company			23,998,505
Interest on common units of NCM owned by Company			20.00%