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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 30, 2014
Amortizable intangible assets    
Accumulated Amortization $ (54,301)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ (49,650)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Book Value 634,419us-gaap_FiniteLivedIntangibleAssetsNet 639,045us-gaap_FiniteLivedIntangibleAssetsNet
Franchise rights    
Amortizable intangible assets    
Gross Carrying Amount 688,720us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
688,695us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
Accumulated Amortization (54,301)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
(49,650)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
Net Book Value 634,419us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
639,045us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
Favorable leasehold interests    
Amortizable intangible assets    
Gross Carrying Amount 13,850us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_FavorableLeaseholdInterestsMember
14,479us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_FavorableLeaseholdInterestsMember
Accumulated Amortization (3,351)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_FavorableLeaseholdInterestsMember
(3,679)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_FavorableLeaseholdInterestsMember
Net Book Value 10,499us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_FavorableLeaseholdInterestsMember
10,800us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_FavorableLeaseholdInterestsMember
Unfavorable leasehold interests    
Amortizable intangible assets    
Gross Carrying Amount (17,105)us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_UnfavorableLeaseholdInterestsMember
(17,417)us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_UnfavorableLeaseholdInterestsMember
Accumulated Amortization 6,646us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_UnfavorableLeaseholdInterestsMember
6,447us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_UnfavorableLeaseholdInterestsMember
Net Book Value (10,459)us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_UnfavorableLeaseholdInterestsMember
(10,970)us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_UnfavorableLeaseholdInterestsMember
Amortizable Intangible Assets    
Amortizable intangible assets    
Gross Carrying Amount 685,465us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_AmortizableIntangibleAssetsMember
685,757us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_AmortizableIntangibleAssetsMember
Accumulated Amortization (51,006)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_AmortizableIntangibleAssetsMember
(46,882)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_AmortizableIntangibleAssetsMember
Net Book Value $ 634,459us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_AmortizableIntangibleAssetsMember
$ 638,875us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= npci_AmortizableIntangibleAssetsMember