Investment in National CineMedia - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Equity in earnings	$ 11,047	$ 10,328	$ 20,372	$ 17,548
Number of additional common units of NCM received under common unit adjustment agreement			1,074,910
Value of common units received from NCM			$ 15,421	8,216
Remaining term of exhibitor services agreement			21 years
Number of common units of NCM owned by Company	25,631,046		25,631,046
Percentage ownership in NCM	20.00%		20.00%
NCM
Schedule of Equity Method Investments [Line Items]
Contract termination costs incurred by NCM			$ 26,800
Equity in earnings	$ 6,263	$ 5,389	$ 6,672	$ 5,746