Employee Retirement Plans - Summary of the Plans' Net Periodic Pension Cost, Benefit Obligations, Funded Status, and Net Balance Sheet Position (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 31, 2010
Elgin Plan [Member]
Net Periodic Pension Cost:
Service cost	$ 0	$ 0
Interest cost	198	226
Expected return on assets	(171)	(178)
Amortization of net loss (gain)	218	125
Amortization of net loss (gain)	0	0
Net periodic benefit cost	245	173
Change in Benefit Obligation:
Benefit obligation – beginning of year	4,801		4,142
Benefit obligations – acquisitions	0	0
Service cost	0	0
Interest cost	198	226
Actuarial loss (gain)	125	695
Pension settlement	0	0
Net benefit payments	(262)	(262)
Benefit obligation – end of year	4,862	4,801	4,142
Change in Plan Assets:
Plan assets at fair value – beginning of year	3,188		3,342
Plan assets at fair value – acquisitions	0	0
Company contributions	255	156
Investment (loss) gain	322	(49)
Benefit payments and plan expenses	(262)	(261)
Plan assets at fair value – end of year	3,503	3,188	3,342
Funded Status:
Unfunded benefit obligation	(1,359)	(1,613)
Amounts recognized in balance sheet at year end:
Other noncurrent liabilities	(1,359)	(1,613)
Pre-tax components in accumulated other comprehensive income:
Net actuarial loss (gain)	1,857	2,102
Net prior service cost	0	0
Net transaction (asset) obligations	0	0
Total amount recognized	1,857	2,102
Accumulated Benefit Obligation	4,862	4,801
Assumed discount rate	4.00%	4.30%
Expected return on assets	5.50%	5.50%
Smithville Plan [Member]
Net Periodic Pension Cost:
Service cost	0	0
Interest cost	642	669
Expected return on assets	(546)	(571)
Amortization of net loss (gain)	537	203
Amortization of net loss (gain)	0	0
Net periodic benefit cost	633	301
Change in Benefit Obligation:
Benefit obligation – beginning of year	15,204		11,958
Benefit obligations – acquisitions	0	0
Service cost	0	0
Interest cost	642	669
Actuarial loss (gain)	724	2,978
Pension settlement	0	0
Net benefit payments	(500)	(401)
Benefit obligation – end of year	16,070	15,204	11,958
Change in Plan Assets:
Plan assets at fair value – beginning of year	7,820		8,253
Plan assets at fair value – acquisitions	0	0
Company contributions	638	225
Investment (loss) gain	823	(257)
Benefit payments and plan expenses	(500)	(401)
Plan assets at fair value – end of year	8,781	7,820	8,253
Funded Status:
Unfunded benefit obligation	(7,289)	(7,384)
Amounts recognized in balance sheet at year end:
Other noncurrent liabilities	(7,289)	(7,384)
Pre-tax components in accumulated other comprehensive income:
Net actuarial loss (gain)	6,201	6,291
Net prior service cost	0	0
Net transaction (asset) obligations	0	0
Total amount recognized	6,201	6,291
Accumulated Benefit Obligation	16,070	15,204
Assumed discount rate	4.00%	4.30%
Expected return on assets	7.00%	7.00%
Wrexham Plan [Member]
Net Periodic Pension Cost:
Service cost	0	0
Interest cost	654	415
Expected return on assets	(787)	(480)
Amortization of net loss (gain)	0	0
Amortization of net loss (gain)	0	0
Net periodic benefit cost	(133)	(65)
Change in Benefit Obligation:
Benefit obligation – beginning of year	13,689		0
Benefit obligations – acquisitions	0	13,328
Service cost	0	0
Interest cost	654	415
Actuarial loss (gain)	1,238	192
Pension settlement	0	0
Net benefit payments	(706)	(246)
Benefit obligation – end of year	15,462	13,689	0
Change in Plan Assets:
Plan assets at fair value – beginning of year	11,518		0
Plan assets at fair value – acquisitions	0	11,798
Company contributions	499	465
Investment (loss) gain	1,191	(499)
Benefit payments and plan expenses	(706)	(246)
Plan assets at fair value – end of year	12,997	11,518	0
Funded Status:
Unfunded benefit obligation	(2,465)	(2,171)
Amounts recognized in balance sheet at year end:
Other noncurrent liabilities	(2,465)	(2,171)
Pre-tax components in accumulated other comprehensive income:
Net actuarial loss (gain)	2,303	1,409
Net prior service cost	0	0
Net transaction (asset) obligations	0	0
Total amount recognized	2,303	1,409
Accumulated Benefit Obligation	15,462	13,689
Assumed discount rate	4.10%	4.70%
Expected return on assets	6.20%	6.60%
Directors Plans [Member]
Net Periodic Pension Cost:
Service cost	1,625	1,123
Interest cost	553	472
Expected return on assets	0	0
Amortization of net loss (gain)	(405)	507
Amortization of net loss (gain)	0	13
Net periodic benefit cost	1,773	2,115
Change in Benefit Obligation:
Benefit obligation – beginning of year	11,378		7,028
Benefit obligations – acquisitions	0	0
Service cost	1,625	1,123
Interest cost	553	472
Actuarial loss (gain)	(4,563)	3,043
Pension settlement	0	12
Net benefit payments	0	(300)
Benefit obligation – end of year	8,993	11,378	7,028
Change in Plan Assets:
Plan assets at fair value – beginning of year	0		0
Plan assets at fair value – acquisitions	0	0
Company contributions	0	300
Investment (loss) gain	0	0
Benefit payments and plan expenses	0	(300)
Plan assets at fair value – end of year	0	0	0
Funded Status:
Unfunded benefit obligation	(8,993)	(11,378)
Amounts recognized in balance sheet at year end:
Other noncurrent liabilities	(8,993)	(11,378)
Pre-tax components in accumulated other comprehensive income:
Net actuarial loss (gain)	(1,622)	2,536
Net prior service cost	0	0
Net transaction (asset) obligations	0	0
Total amount recognized	(1,622)	2,536
Accumulated Benefit Obligation	$ 4,764	$ 3,999
Salary growth rate	10.00%	10.00%
Assumed discount rate	4.00%	4.30%