Financial Guarantees and Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 9,992	$ (1,618)
Effect of Exchange Rate on Cash and Cash Equivalents	(499)	(183)
Cash and Cash Equivalents, Period Increase (Decrease)	125,132	(17,408)
Less: Earnings attributable to noncontrolling interests	(2,293)	0
Investing activities:
Purchases of property, plant and equipment	(33,800)	(26,500)
Proceeds from sale of assets	(47)	(75)
Acquisition of intangibles and other	(124)	(135)
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	(389,916)	(26,560)
Financing activities:
Proceeds from Issuance of Common Stock	0	(232)
Proceeds from long-term borrowings	523,152	14,177
Proceeds from short-term borrowings	17,421	1,879
Repayment of long-term borrowings	(7,857)	(3,317)
Repayment of short-term borrowings	(5,849)	(1,554)
Payments of Financing Costs	21,312	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	211,196	80,471
Net Cash Provided by (Used in) Financing Activities	505,555	10,953
PGI (Issuer)
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	194,945	(10,239)
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	(1,772)	213
Less: Earnings attributable to noncontrolling interests	0
Investing activities:
Purchases of property, plant and equipment	(1,703)	(23,207)
Proceeds from sale of assets	0	0
Acquisition of intangibles and other	(124)	(135)
Payments to Acquire Businesses, Net of Cash Acquired	(356,039)
Intercompany investing activities, net	(372,158)	5,766
Net Cash Provided by (Used in) Investing Activities	(730,024)	(17,576)
Financing activities:
Proceeds from Issuance of Common Stock		(232)
Proceeds from long-term borrowings	523,000	0
Proceeds from short-term borrowings	1,265	1,879
Repayment of long-term borrowings	(3,808)	(65)
Repayment of short-term borrowings	(956)	(1,554)
Payments of Financing Costs	21,312	0
Intercompany financing activities, net	35,118	28,000
Cash and cash equivalents at beginning of period	2,068	486
Cash and cash equivalents at end of period	296	699
Net Cash Provided by (Used in) Financing Activities	533,307	28,028
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	148,994	22,547
Effect of Exchange Rate on Cash and Cash Equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	108,356	(9,377)
Less: Earnings attributable to noncontrolling interests	0
Investing activities:
Purchases of property, plant and equipment	(16,422)	(1,658)
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	(399,794)	(28,500)
Net Cash Provided by (Used in) Investing Activities	(416,216)	(30,158)
Financing activities:
Proceeds from Issuance of Common Stock		0
Proceeds from long-term borrowings	0	0
Proceeds from short-term borrowings	0	0
Repayment of long-term borrowings	0	0
Repayment of short-term borrowings	0	0
Payments of Financing Costs	0	0
Intercompany financing activities, net	375,578	(1,766)
Cash and cash equivalents at beginning of period	13,103	28,285
Cash and cash equivalents at end of period	121,459	18,908
Net Cash Provided by (Used in) Financing Activities	375,578	(1,766)
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(333,947)	(13,926)
Effect of Exchange Rate on Cash and Cash Equivalents	(499)	(183)
Cash and Cash Equivalents, Period Increase (Decrease)	18,548	(8,244)
Less: Earnings attributable to noncontrolling interests	(2,293)
Investing activities:
Purchases of property, plant and equipment	(15,675)	(1,635)
Proceeds from sale of assets	(47)	(75)
Acquisition of intangibles and other	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0
Intercompany investing activities, net	(6,450)	(4,000)
Net Cash Provided by (Used in) Investing Activities	(22,078)	(5,560)
Financing activities:
Proceeds from Issuance of Common Stock		0
Proceeds from long-term borrowings	152	14,177
Proceeds from short-term borrowings	16,156	0
Repayment of long-term borrowings	(4,049)	(3,252)
Repayment of short-term borrowings	(4,893)	0
Payments of Financing Costs	0	0
Intercompany financing activities, net	367,706	500
Cash and cash equivalents at beginning of period	70,893	69,108
Cash and cash equivalents at end of period	89,441	60,864
Net Cash Provided by (Used in) Financing Activities	375,072	11,425
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	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	0
Less: Earnings attributable to noncontrolling interests	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	778,402	26,734
Net Cash Provided by (Used in) Investing Activities	778,402	26,734
Financing activities:
Proceeds from Issuance of Common Stock		0
Proceeds from long-term borrowings	0	0
Proceeds from short-term borrowings	0	0
Repayment of long-term borrowings	0	0
Repayment of short-term borrowings	0	0
Payments of Financing Costs	0	0
Intercompany financing activities, net	(778,402)	(26,734)
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	$ (778,402)	$ (26,734)