Condensed Consolidating Financial Statements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 26, 2013	Mar. 27, 2012
Operating activities
Net cash flows provided by operating activities	$ 36,798	$ 24,220
Investing activities
Capital expenditures	(9,630)	(8,496)
Purchase of the stock of the Company	0	(431,589)
Purchase of business assets, net of cash acquired	0	(19,322)
Proceeds from sale or disposition of assets	40	21
Net cash used in investing activities	(9,590)	(459,386)
Financing activities
Retirement of predecessor entity debt and other obligations	0	(372,700)
Proceeds from equity contributions, net	0	216,635
Issuance of debt	0	565,000
Debt issue costs	(38)	(27,794)
Interest rate derivative	0	(636)
Net cash (used in) provided by financing activities	(640)	380,505
Net change in cash and cash equivalents	26,568	(54,661)
Beginning cash and cash equivalents	25,493	78,394
Ending cash and cash equivalents	52,061	23,733
Parent Guarantor: Holdings [Member]
Operating activities
Net cash flows provided by operating activities
Investing activities
Capital expenditures
Purchase of the stock of the Company		(216,635)
Purchase of business assets, net of cash acquired
Proceeds from sale or disposition of assets
Net cash used in investing activities		(216,635)
Financing activities
Retirement of predecessor entity debt and other obligations
Proceeds from equity contributions, net		216,635
Issuance of debt
Debt issue costs
Interest rate derivative
Net cash (used in) provided by financing activities		216,635
Net change in cash and cash equivalents
Beginning cash and cash equivalents
Ending cash and cash equivalents
Subsidiary Issuer: NPC [Member]
Operating activities
Net cash flows provided by operating activities	36,798	24,220
Investing activities
Capital expenditures	(9,630)	(8,496)
Purchase of the stock of the Company		(431,589)
Purchase of business assets, net of cash acquired		(19,322)
Proceeds from sale or disposition of assets	40	21
Net cash used in investing activities	(9,590)	(459,386)
Financing activities
Retirement of predecessor entity debt and other obligations		(372,700)
Proceeds from equity contributions, net		216,635
Issuance of debt		565,000
Debt issue costs		(27,794)
Interest rate derivative		(636)
Net cash (used in) provided by financing activities	640	380,505
Net change in cash and cash equivalents	26,568	(54,661)
Beginning cash and cash equivalents	25,493	78,394
Ending cash and cash equivalents	52,061	23,733
Subsidiary Co-Issuer: NPC Op Co A [Member]
Operating activities
Net cash flows provided by operating activities
Investing activities
Capital expenditures
Purchase of the stock of the Company
Purchase of business assets, net of cash acquired
Proceeds from sale or disposition of assets
Net cash used in investing activities
Financing activities
Retirement of predecessor entity debt and other obligations
Proceeds from equity contributions, net
Issuance of debt
Debt issue costs
Interest rate derivative
Net cash (used in) provided by financing activities
Net change in cash and cash equivalents
Beginning cash and cash equivalents
Ending cash and cash equivalents
Subsidiary Co-Issuer: NPC Op Co B [Member]
Operating activities
Net cash flows provided by operating activities
Investing activities
Capital expenditures
Purchase of the stock of the Company
Purchase of business assets, net of cash acquired
Proceeds from sale or disposition of assets
Net cash used in investing activities
Financing activities
Retirement of predecessor entity debt and other obligations
Proceeds from equity contributions, net
Issuance of debt
Debt issue costs
Interest rate derivative
Net cash (used in) provided by financing activities
Net change in cash and cash equivalents
Beginning cash and cash equivalents
Ending cash and cash equivalents
Eliminations [Member]
Operating activities
Net cash flows provided by operating activities
Investing activities
Capital expenditures
Purchase of the stock of the Company		216,635
Purchase of business assets, net of cash acquired
Proceeds from sale or disposition of assets
Net cash used in investing activities		216,635
Financing activities
Retirement of predecessor entity debt and other obligations
Proceeds from equity contributions, net		(216,635)
Issuance of debt
Debt issue costs
Interest rate derivative
Net cash (used in) provided by financing activities		(216,635)
Net change in cash and cash equivalents
Beginning cash and cash equivalents
Ending cash and cash equivalents