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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, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net loss	$ (20,485)us-gaap_NetIncomeLoss	$ (16,406)us-gaap_NetIncomeLoss	$ (3,116)us-gaap_NetIncomeLoss	$ (19,272)us-gaap_NetIncomeLoss	$ (11,482)us-gaap_NetIncomeLoss	$ 16,259us-gaap_NetIncomeLoss	$ (1,556)us-gaap_NetIncomeLoss	$ (28,116)us-gaap_NetIncomeLoss	$ (59,279)us-gaap_NetIncomeLoss	$ (24,895)us-gaap_NetIncomeLoss	$ (36,768)us-gaap_NetIncomeLoss
Foreign currency translation adjustment									276	(815)	80
Pension liability adjustments, net of tax									(6,032)	931	953
Total other comprehensive loss									(5,756)	116	1,033
Total comprehensive loss									(65,035)us-gaap_ComprehensiveIncomeNetOfTax	(24,779)us-gaap_ComprehensiveIncomeNetOfTax	(35,735)us-gaap_ComprehensiveIncomeNetOfTax
Parent
Condensed Financial Statements, Captions [Line Items]
Net loss									(59,279)	(24,895)	(36,768)
Foreign currency translation adjustment									276	(815)	80
Pension liability adjustments, net of tax									(6,032)	931	953
Total other comprehensive loss									(5,756)	116	1,033
Total comprehensive loss									(65,035)	(24,779)	(35,735)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net loss									(58,855)	(24,227)	(36,450)
Foreign currency translation adjustment									276	(815)	80
Pension liability adjustments, net of tax									(6,032)	931	953
Total other comprehensive loss									(5,756)	116	1,033
Total comprehensive loss									(64,611)	(24,111)	(35,417)
Non-Guarantor
Condensed Financial Statements, Captions [Line Items]
Net loss									(5,328)	(14,391)	(13,618)
Foreign currency translation adjustment									276	(815)	367
Pension liability adjustments, net of tax									(2,674)	(936)	1,196
Total other comprehensive loss									(2,398)	(1,751)	1,563
Total comprehensive loss									(7,726)	(16,142)	(12,055)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net loss									64,183	38,618	50,068
Foreign currency translation adjustment									(552)	1,630	(447)
Pension liability adjustments, net of tax									8,706	5	(2,149)
Total other comprehensive loss									8,154	1,635	(2,596)
Total comprehensive loss									$ 72,337	$ 40,253	$ 47,472