Supplemental Guarantor Condensed Financial Information - Consolidated Statements of Comprehensive (Loss) Income (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 loss	$ (3,116)	$ (1,556)	$ (22,388)	$ (29,672)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(65)	(157)	(454)	(342)
Defined benefit pension plan adjustments, net of tax	(21)	(81)	(41)	(165)
Total comprehensive loss	(3,160)	(1,632)	(22,801)	(29,849)
Parent
Condensed Financial Statements, Captions [Line Items]
Net loss	(3,116)	(1,556)	(22,388)	(29,672)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(65)	(157)	(454)	(342)
Defined benefit pension plan adjustments, net of tax	(21)	(81)	(41)	(165)
Total comprehensive loss	(3,160)	(1,632)	(22,801)	(29,849)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net loss	(3,014)	(1,461)	(22,168)	(29,484)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(65)	(157)	(454)	(342)
Defined benefit pension plan adjustments, net of tax	(21)	(81)	(41)	(165)
Total comprehensive loss	(3,058)	(1,537)	(22,581)	(29,661)
Non-Guarantor
Condensed Financial Statements, Captions [Line Items]
Net loss	(1,292)	(2,557)	(2,984)	(7,448)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(65)	(157)	(454)	(342)
Defined benefit pension plan adjustments, net of tax	(19)	(10)	(37)	(21)
Total comprehensive loss	(1,338)	(2,704)	(3,401)	(7,769)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net loss	4,306	4,018	25,152	36,932
Other comprehensive (loss) income:
Foreign currency translation adjustment	130	314	908	684
Defined benefit pension plan adjustments, net of tax	40	91	78	186
Total comprehensive loss	$ 4,396	$ 4,241	$ 25,982	$ 37,430