Summary Financial Information for National Cinemedia (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2015	Jul. 02, 2015	Sep. 30, 2014	Sep. 25, 2014	Jul. 02, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 25, 2014
Schedule of Equity Method Investments [Line Items]
Revenues	$ 700,056		$ 646,903			$ 2,145,386	$ 1,967,046
Operating income	99,127		82,284			324,058	267,005
Net earnings	$ 46,701		$ 38,532			$ 160,493	$ 146,362
NCM
Schedule of Equity Method Investments [Line Items]
Revenues		$ 121,532		$ 100,738	$ 198,399			$ 270,911
Operating income		16,658		42,858	31,276			97,756
Net earnings		$ 42,404		$ 26,909	$ 3,675			$ 50,612