Summary Financial Information for National Cinemedia (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 28, 2012 Ncm
Schedule of Equity Method Investments [Line Items]
Gross revenues			$ 448,760
Operating income	65,629	89,488	191,839
Net earnings	$ 33,062	$ 42,876	$ 101,013