Financial Guarantees and Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 12,058	$ 4,106
Effect of Exchange Rate on Cash and Cash Equivalents	(3,904)	248
Cash and Cash Equivalents, Period Increase (Decrease)	96,619	(23,201)
Less: Earnings attributable to noncontrolling interest and redeemable noncontrolling interest	(4,216)	0
Investing activities:
Purchases of property, plant and equipment	(53,809)	(35,499)
Proceeds from sale of assets	(2,635)	(25)
Acquisition of intangibles and other	(182)	(4,486)
Payments to Acquire Businesses, Net of Cash Acquired	(356,039)	0
Intercompany investing activities, net	0	0
Net cash provided by (used in) investing activities	(407,395)	(39,960)
Financing activities:
Proceeds from Issuance of Common Stock	750	(222)
Proceeds from long-term borrowings	628,152	18,490
Proceeds from short-term borrowings	21,594	1,879
Repayment of long-term borrowings	(121,070)	(5,266)
Repayment of short-term borrowings	(8,222)	(2,476)
Payments of Financing Costs	(21,289)	0
Debt modification costs	(4,055)	0
Intercompany financing activities, net	0	0
Cash and cash equivalents at beginning of period	86,064	97,879
Cash and cash equivalents at end of period	182,683	74,678
Net Cash Provided by (Used in) Financing Activities	495,860	12,405
PGI (Issuer)
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	127,723	(42,502)
Effect of Exchange Rate on Cash and Cash Equivalents		0
Cash and Cash Equivalents, Period Increase (Decrease)	1,958	1,049
Less: Earnings attributable to noncontrolling interest and redeemable noncontrolling interest	0
Investing activities:
Purchases of property, plant and equipment	(2,469)	(23,703)
Proceeds from sale of assets	0	0
Acquisition of intangibles and other	(182)	(260)
Payments to Acquire Businesses, Net of Cash Acquired	(356,039)
Intercompany investing activities, net	(361,604)	6,408
Net cash provided by (used in) investing activities	(720,294)	(17,555)
Financing activities:
Proceeds from Issuance of Common Stock	750	(222)
Proceeds from long-term borrowings	628,000	234
Proceeds from short-term borrowings	1,265	1,879
Repayment of long-term borrowings	(61,478)	(109)
Repayment of short-term borrowings	(1,556)	(2,476)
Payments of Financing Costs	(21,289)	0
Debt modification costs	(1,680)
Intercompany financing activities, net	50,517	61,800
Cash and cash equivalents at beginning of period	2,068	486
Cash and cash equivalents at end of period	4,026	1,535
Net Cash Provided by (Used in) Financing Activities	594,529	61,106
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	178,124	46,834
Effect of Exchange Rate on Cash and Cash Equivalents		0
Cash and Cash Equivalents, Period Increase (Decrease)	99,794	(16,310)
Less: Earnings attributable to noncontrolling interest and redeemable noncontrolling interest	0
Investing activities:
Purchases of property, plant and equipment	(22,092)	(2,663)
Proceeds from sale of assets	0	0
Acquisition of intangibles and other	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0
Intercompany investing activities, net	(421,262)	(59,073)
Net cash provided by (used in) investing activities	(443,354)	(61,736)
Financing activities:
Proceeds from Issuance of Common Stock	0	0
Proceeds from long-term borrowings		0
Proceeds from short-term borrowings		0
Repayment of long-term borrowings		0
Repayment of short-term borrowings		0
Payments of Financing Costs		0
Intercompany financing activities, net	365,024	(1,408)
Cash and cash equivalents at beginning of period	13,103	28,285
Cash and cash equivalents at end of period	112,897	11,975
Net Cash Provided by (Used in) Financing Activities	365,024	(1,408)
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(293,789)	(226)
Effect of Exchange Rate on Cash and Cash Equivalents	(3,904)	248
Cash and Cash Equivalents, Period Increase (Decrease)	(5,133)	(7,940)
Less: Earnings attributable to noncontrolling interest and redeemable noncontrolling interest	(4,216)
Investing activities:
Purchases of property, plant and equipment	(29,248)	(9,133)
Proceeds from sale of assets	(2,635)	(25)
Acquisition of intangibles and other	0	(4,226)
Payments to Acquire Businesses, Net of Cash Acquired	0
Intercompany investing activities, net	2,651	(5,000)
Net cash provided by (used in) investing activities	(23,962)	(18,334)
Financing activities:
Proceeds from Issuance of Common Stock	0	0
Proceeds from long-term borrowings	152	18,256
Proceeds from short-term borrowings	20,329	0
Repayment of long-term borrowings	(59,592)	(5,157)
Repayment of short-term borrowings	(6,666)	0
Payments of Financing Costs		0
Debt modification costs	(2,375)
Intercompany financing activities, net	364,674	(2,727)
Cash and cash equivalents at beginning of period	70,893	69,108
Cash and cash equivalents at end of period	65,760	61,168
Net Cash Provided by (Used in) Financing Activities	316,522	10,372
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0
Effect of Exchange Rate on Cash and Cash Equivalents		0
Cash and Cash Equivalents, Period Increase (Decrease)		0
Less: Earnings attributable to noncontrolling interest and redeemable noncontrolling interest	0
Investing activities:
Purchases of property, plant and equipment	0	0
Proceeds from sale of assets	0	0
Acquisition of intangibles and other	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0
Intercompany investing activities, net	780,215	57,665
Net cash provided by (used in) investing activities	780,215	57,665
Financing activities:
Proceeds from Issuance of Common Stock	0	0
Proceeds from long-term borrowings		0
Proceeds from short-term borrowings		0
Repayment of long-term borrowings		0
Repayment of short-term borrowings		0
Payments of Financing Costs		0
Intercompany financing activities, net	(780,215)	(57,665)
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Net Cash Provided by (Used in) Financing Activities	$ (780,215)	$ (57,665)