Business Acquisitions - Net Sales and Net Earnings Attributable to PLG (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 08, 2012	Jun. 16, 2012	Mar. 24, 2012	Sep. 10, 2011	Jun. 18, 2011	Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Business Acquisition [Line Items]
Revenue	$ 353,067	$ 312,720	$ 322,807	$ 361,590	$ 310,139	$ 330,872	$ 652,244	$ 406,466	$ 1,640,838	$ 1,409,068	$ 1,248,517
Net loss	32,727	20,496	31,180	40,435	23,963	35,863	(3,717)	23,026	80,686	123,287	104,470
PLG [Member]
Business Acquisition [Line Items]
Revenue									219,400
Net loss									$ (2,400)