Accounting Policies and Basis of Presentation (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012	Jan. 28, 2012 PS International	Jun. 29, 2013 PS International	Mar. 31, 2012 PS International	Dec. 31, 2012 PS International	Jan. 02, 2012 PS International
Equity method investments
Percentage ownership acquired									50.00%
Ownership after increase (as a percent)					70.00%			85.00%
Total cash paid, net of cash acquired				$ 2,825,000	$ 2,825,000	$ 515,000	$ 2,825,000
Increase in working capital							14,419,000
Increase in fixed assets							163,000
Increase in goodwill							2,590,000
Increase in intangible assets						515,000	621,000
Increase in other long-term assets							96,000
Increase in non-controlling interest							5,649,000
Decrease in investment in and advances to affiliates							9,415,000
Non-cash, pay-in-kind interest income and accretion of discount recognized on a note receivable from an affiliate	$ 3,320,000	$ 2,940,000	$ 6,431,000	$ 5,758,000