Segment Reporting - Segment Financial Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 1,247,380	$ 1,226,256	$ 2,433,006	$ 2,405,469
Income before interest and income taxes	101,611	92,038	188,172	173,454
Restructuring/Asset impairment charges	(3,671)	(8,678)	(5,663)	(12,967)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	1,247,380	1,226,256	2,433,006	2,405,469
Operating Segments [Member] | Consumer Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	473,666	475,013	938,591	938,313
Income before interest and income taxes	42,831	47,366	91,014	89,706
Operating Segments [Member] | Paper And Industrial Converted Products [Member]
Segment Reporting Information [Line Items]
Net sales	490,016	473,217	945,626	927,424
Income before interest and income taxes	46,543	35,991	76,293	66,995
Operating Segments [Member] | Display and Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	162,515	157,516	315,537	302,091
Income before interest and income taxes	7,514	6,071	12,871	9,574
Operating Segments [Member] | Protective Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	121,183	120,510	233,252	237,641
Income before interest and income taxes	9,640	11,376	14,927	21,100
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	28,745	27,709	57,072	53,852
Intersegment Sales [Member] | Consumer Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	875	1,446	1,908	2,806
Intersegment Sales [Member] | Paper And Industrial Converted Products [Member]
Segment Reporting Information [Line Items]
Net sales	26,653	25,017	52,998	48,472
Intersegment Sales [Member] | Display and Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	397	519	780	1,174
Intersegment Sales [Member] | Protective Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	820	727	1,386	1,400
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Restructuring/Asset impairment charges	(3,671)	(8,678)	(5,663)	(12,967)
Other, net	$ (1,246)	$ (88)	$ (1,270)	$ (954)