Supplemental Guarantor Condensed Financial Information - Consolidated Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 232,990	$ 229,861	$ 402,894	$ 402,406
Costs and Expense:
Cost of goods sold (excluding depreciation and amortization)	193,077	190,461	340,048	339,631
Selling and general (excluding depreciation and amortization)	19,190	19,940	37,966	39,380
Depreciation and amortization	8,251	8,450	16,453	17,043
Other operating charges	2,341	1,126	3,306	3,900
Income (loss) from operations	10,131	9,884	5,121	2,452
Equity in earnings of subsidiaries	0	0	0	0
Interest expense	(13,914)	(13,854)	(27,679)	(27,452)
Intercompany income (loss), net	0	0	0	0
Other (loss) income, net	(516)	2,111	(320)	(4,234)
(Loss) income before income taxes	(4,299)	(1,859)	(22,878)	(29,234)
(Benefit from) provision for income taxes	(1,183)	(303)	(490)	438
Net loss	(3,116)	(1,556)	(22,388)	(29,672)
Parent
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Costs and Expense:
Cost of goods sold (excluding depreciation and amortization)	0	0	0	0
Selling and general (excluding depreciation and amortization)	102	95	220	188
Depreciation and amortization	0	0	0	0
Other operating charges	0	0	0	0
Income (loss) from operations	(102)	(95)	(220)	(188)
Equity in earnings of subsidiaries	(3,014)	(1,461)	(22,168)	(29,484)
Interest expense	0	0	0	0
Intercompany income (loss), net	0	0	0	0
Other (loss) income, net	0	0	0	0
(Loss) income before income taxes	(3,116)	(1,556)	(22,388)	(29,672)
(Benefit from) provision for income taxes	0	0	0	0
Net loss	(3,116)	(1,556)	(22,388)	(29,672)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales	161,813	158,120	263,659	263,434
Costs and Expense:
Cost of goods sold (excluding depreciation and amortization)	134,370	131,031	226,143	224,095
Selling and general (excluding depreciation and amortization)	12,067	13,669	24,478	26,730
Depreciation and amortization	5,403	5,558	10,792	11,133
Other operating charges	1,694	248	2,236	666
Income (loss) from operations	8,279	7,614	10	810
Equity in earnings of subsidiaries	(1,292)	(2,557)	(2,984)	(7,448)
Interest expense	(13,542)	(13,507)	(26,949)	(26,856)
Intercompany income (loss), net	4,774	4,402	9,339	8,680
Other (loss) income, net	(1,170)	2,529	(853)	(3,422)
(Loss) income before income taxes	(2,951)	(1,519)	(21,437)	(28,236)
(Benefit from) provision for income taxes	63	(58)	731	1,248
Net loss	(3,014)	(1,461)	(22,168)	(29,484)
Non-Guarantor
Condensed Financial Statements, Captions [Line Items]
Net sales	73,178	73,820	142,760	142,543
Costs and Expense:
Cost of goods sold (excluding depreciation and amortization)	60,708	61,509	117,430	119,107
Selling and general (excluding depreciation and amortization)	7,021	6,176	13,268	12,462
Depreciation and amortization	2,848	2,892	5,661	5,910
Other operating charges	647	878	1,070	3,234
Income (loss) from operations	1,954	2,365	5,331	1,830
Equity in earnings of subsidiaries	0	0	0	0
Interest expense	(372)	(347)	(730)	(596)
Intercompany income (loss), net	(4,774)	(4,402)	(9,339)	(8,680)
Other (loss) income, net	654	(418)	533	(812)
(Loss) income before income taxes	(2,538)	(2,802)	(4,205)	(8,258)
(Benefit from) provision for income taxes	(1,246)	(245)	(1,221)	(810)
Net loss	(1,292)	(2,557)	(2,984)	(7,448)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales	(2,001)	(2,079)	(3,525)	(3,571)
Costs and Expense:
Cost of goods sold (excluding depreciation and amortization)	(2,001)	(2,079)	(3,525)	(3,571)
Selling and general (excluding depreciation and amortization)	0	0	0	0
Depreciation and amortization	0	0	0	0
Other operating charges	0	0	0	0
Income (loss) from operations	0	0	0	0
Equity in earnings of subsidiaries	4,306	4,018	25,152	36,932
Interest expense	0	0	0	0
Intercompany income (loss), net	0	0	0	0
Other (loss) income, net	0	0	0	0
(Loss) income before income taxes	4,306	4,018	25,152	36,932
(Benefit from) provision for income taxes	0	0	0	0
Net loss	$ 4,306	$ 4,018	$ 25,152	$ 36,932