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Investment in National CineMedia - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended
	May 31, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]
Equity earnings			$ 11,733	$ 6,844	$ 15,839	$ 9,622
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		23,998,505
Interest on common units of NCM owned by Company			20.00%		20.00%
NCM
Schedule of Equity Method Investments [Line Items]
Equity earnings					$ 8,524	$ 3,574

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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