Supplemental Guarantor Condensed Financial Information - Consolidated Statements of Comprehensive (Loss) Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net loss	$ (11,482)	$ 16,259	$ (1,556)	$ (28,116)	$ (11,881)	$ (1,175)	$ (15,592)	$ (8,120)	$ (24,895)	$ (36,768)	$ (62,717)
Foreign currency translation adjustment									(815)	80	2,380
Pension liability adjustment, net of tax									931	953	(5,837)
Total other comprehensive income (loss)									116	1,033	(3,457)
Total comprehensive loss									(24,779)	(35,735)	(66,174)
Parent
Condensed Financial Statements, Captions [Line Items]
Net loss									(24,895)	(36,768)	(62,717)
Foreign currency translation adjustment									(815)	80	2,380
Pension liability adjustment, net of tax									931	953	(5,837)
Total other comprehensive income (loss)									116	1,033	(3,457)
Total comprehensive loss									(24,779)	(35,735)	(66,174)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net loss									(24,227)	(36,450)	(62,123)
Foreign currency translation adjustment									(815)	80	2,380
Pension liability adjustment, net of tax									931	953	(5,837)
Total other comprehensive income (loss)									116	1,033	(3,457)
Total comprehensive loss									(24,111)	(35,417)	(65,580)
Non-Guarantor
Condensed Financial Statements, Captions [Line Items]
Net loss									(14,391)	(13,618)	(4,514)
Foreign currency translation adjustment									(815)	367	2,092
Pension liability adjustment, net of tax									(936)	1,196	(3,351)
Total other comprehensive income (loss)									(1,751)	1,563	(1,259)
Total comprehensive loss									(16,142)	(12,055)	(5,773)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net loss									38,618	50,068	66,637
Foreign currency translation adjustment									1,630	(447)	(4,472)
Pension liability adjustment, net of tax									5	(2,149)	9,188
Total other comprehensive income (loss)									1,635	(2,596)	4,716
Total comprehensive loss									$ 40,253	$ 47,472	$ 71,353