Supplemental Guarantor Condensed Financial Information - Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Apr. 03, 2015	Dec. 31, 2014	Mar. 28, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Subsidiary ownership percentage	100.00%
ASSETS
Cash and cash equivalents	$ 1,868	$ 2,074	$ 4,398	$ 8,977
Accounts receivable, less allowance for doubtful accounts	88,357	80,329
Inventories, net	110,648	106,385
Income taxes receivable	1,897	1,734
Deferred income taxes	424	426
Other current assets	7,750	7,009
Total current assets	210,944	197,957
Property, plant and equipment, net	104,037	111,164
Amounts due from affiliates	0	0
Goodwill	180,659	190,158
Customer relationships, net	22,754	26,315
Other intangible assets, net	6,365	6,495
Investments in consolidated subsidiaries	0	0
Deferred income taxes	179	0
Other assets	3,924	4,687
Total assets	528,862	536,776
LIABILITIES AND SHAREHOLDERS’ (DEFICIT) EQUITY
Accounts payable	83,772	78,846
Accrued expenses and other current liabilities	25,065	25,509
Accrued interest payable	85	12,912
Current portion of long-term debt	450,012	4,663
Deferred income taxes	811	895
Total current liabilities	559,745	122,825
Long-term debt	124,408	534,852
Amounts due to affiliates	0	0
Deferred income taxes	14,073	15,894
Other liabilities	34,711	36,311
Total liabilities	732,937	709,882
Shareholders’ (deficit) equity:
Common stock	196	196
Additional paid-in capital	724,661	724,562
Accumulated loss	(934,440)	(903,029)
Accumulated other comprehensive income	5,508	5,165
Total shareholders’ (deficit) equity	(204,075)	(173,106)
Total liabilities and shareholders’ (deficit) equity	528,862	536,776
Parent
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, less allowance for doubtful accounts	0	0
Inventories, net	0	0
Income taxes receivable	0	0
Deferred income taxes	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Amounts due from affiliates	0	0
Goodwill	0	0
Customer relationships, net	0	0
Other intangible assets, net	0	0
Investments in consolidated subsidiaries	(198,078)	(167,335)
Deferred income taxes	0	0
Other assets	0	0
Total assets	(198,078)	(167,335)
LIABILITIES AND SHAREHOLDERS’ (DEFICIT) EQUITY
Accounts payable	0	0
Accrued expenses and other current liabilities	110	0
Accrued interest payable	0	0
Current portion of long-term debt	0	0
Deferred income taxes	0	0
Total current liabilities	110	0
Long-term debt	0	0
Amounts due to affiliates	5,887	5,771
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	5,997	5,771
Shareholders’ (deficit) equity:
Common stock	196	196
Additional paid-in capital	724,661	724,562
Accumulated loss	(934,440)	(903,029)
Accumulated other comprehensive income	5,508	5,165
Total shareholders’ (deficit) equity	(204,075)	(173,106)
Total liabilities and shareholders’ (deficit) equity	(198,078)	(167,335)
Issuer
ASSETS
Cash and cash equivalents	1	4	8	1,700
Accounts receivable, less allowance for doubtful accounts	44,951	39,607
Inventories, net	82,166	75,512
Income taxes receivable	538	235
Deferred income taxes	382	381
Other current assets	6,188	5,425
Total current assets	134,226	121,164
Property, plant and equipment, net	51,230	53,042
Amounts due from affiliates	180,183	202,008
Goodwill	81,358	81,359
Customer relationships, net	15,069	16,826
Other intangible assets, net	6,365	6,495
Investments in consolidated subsidiaries	(3,955)	(5,318)
Deferred income taxes	0	0
Other assets	2,477	2,883
Total assets	466,953	478,459
LIABILITIES AND SHAREHOLDERS’ (DEFICIT) EQUITY
Accounts payable	59,679	49,869
Accrued expenses and other current liabilities	14,806	16,284
Accrued interest payable	11	12,837
Current portion of long-term debt	434,826	0
Deferred income taxes	0	0
Total current liabilities	509,322	78,990
Long-term debt	124,408	534,852
Amounts due to affiliates	10,811	11,982
Deferred income taxes	11,121	10,468
Other liabilities	9,369	9,502
Total liabilities	665,031	645,794
Shareholders’ (deficit) equity:
Common stock	0	0
Additional paid-in capital	661,769	661,673
Accumulated loss	(865,355)	(834,173)
Accumulated other comprehensive income	5,508	5,165
Total shareholders’ (deficit) equity	(198,078)	(167,335)
Total liabilities and shareholders’ (deficit) equity	466,953	478,459
Non-Guarantor
ASSETS
Cash and cash equivalents	1,867	2,070	4,390	7,277
Accounts receivable, less allowance for doubtful accounts	43,406	40,722
Inventories, net	28,482	30,873
Income taxes receivable	1,359	1,499
Deferred income taxes	42	45
Other current assets	1,562	1,584
Total current assets	76,718	76,793
Property, plant and equipment, net	52,807	58,122
Amounts due from affiliates	18,275	19,277
Goodwill	99,301	108,799
Customer relationships, net	7,685	9,489
Other intangible assets, net	0	0
Investments in consolidated subsidiaries	0	0
Deferred income taxes	179	0
Other assets	1,447	1,804
Total assets	256,412	274,284
LIABILITIES AND SHAREHOLDERS’ (DEFICIT) EQUITY
Accounts payable	24,093	28,977
Accrued expenses and other current liabilities	10,149	9,225
Accrued interest payable	74	75
Current portion of long-term debt	15,186	4,663
Deferred income taxes	811	895
Total current liabilities	50,313	43,835
Long-term debt	0	0
Amounts due to affiliates	181,760	203,532
Deferred income taxes	2,952	5,426
Other liabilities	25,342	26,809
Total liabilities	260,367	279,602
Shareholders’ (deficit) equity:
Common stock	21	21
Additional paid-in capital	199,452	199,453
Accumulated loss	(214,471)	(215,570)
Accumulated other comprehensive income	11,043	10,778
Total shareholders’ (deficit) equity	(3,955)	(5,318)
Total liabilities and shareholders’ (deficit) equity	256,412	274,284
Eliminations
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, less allowance for doubtful accounts	0	0
Inventories, net	0	0
Income taxes receivable	0	0
Deferred income taxes	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Amounts due from affiliates	(198,458)	(221,285)
Goodwill	0	0
Customer relationships, net	0	0
Other intangible assets, net	0	0
Investments in consolidated subsidiaries	202,033	172,653
Deferred income taxes	0	0
Other assets	0	0
Total assets	3,575	(48,632)
LIABILITIES AND SHAREHOLDERS’ (DEFICIT) EQUITY
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Accrued interest payable	0	0
Current portion of long-term debt	0	0
Deferred income taxes	0	0
Total current liabilities	0	0
Long-term debt	0	0
Amounts due to affiliates	(198,458)	(221,285)
Deferred income taxes	0	0
Other liabilities	0	0
Total liabilities	(198,458)	(221,285)
Shareholders’ (deficit) equity:
Common stock	(21)	(21)
Additional paid-in capital	(861,221)	(861,126)
Accumulated loss	1,079,826	1,049,743
Accumulated other comprehensive income	(16,551)	(15,943)
Total shareholders’ (deficit) equity	202,033	172,653
Total liabilities and shareholders’ (deficit) equity	$ 3,575	$ (48,632)