Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Apr. 01, 2014
Operating activities
Net income	$ 4,975us-gaap_NetIncomeLoss	$ 2,956us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	14,933	15,048
Amortization of debt issuance costs	953	1,013
Deferred income taxes	(2,614)us-gaap_DeferredIncomeTaxExpenseBenefit	(906)us-gaap_DeferredIncomeTaxExpenseBenefit
Other	1,023us-gaap_OtherNoncashIncomeExpense	64us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, excluding the effect of acquisitions:
Accounts receivable	1,449	4,135
Inventories	824us-gaap_IncreaseDecreaseInInventories	(569)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	772	466
Accounts payable	(2,470)	(2,181)
Income taxes	5,047	1,562
Accrued interest	(7,878)	(3,553)
Accrued liabilities	6,225	6,607
Insurance reserves	1,096	537
Other deferred items	162	(336)
Other assets	(47)	(70)
Net cash provided by operating activities	24,450	24,773
Investing activities
Capital expenditures	(11,018)	(19,246)
Proceeds from sale or disposition of assets	296	324
Net cash used in investing activities	(10,722)	(18,922)
Financing activities
Borrowings under revolving credit facility	59,000us-gaap_ProceedsFromLinesOfCredit	39,500us-gaap_ProceedsFromLinesOfCredit
Payments under revolving credit facility	(59,000)us-gaap_RepaymentsOfLinesOfCredit	(46,500)us-gaap_RepaymentsOfLinesOfCredit
Payments on term bank facilities	(2,079)us-gaap_RepaymentsOfLongTermDebt	(625)us-gaap_RepaymentsOfLongTermDebt
Payment of accrued purchase price to sellers	0npci_ContingentConsiderationPaid	(10,875)npci_ContingentConsiderationPaid
Net cash used in financing activities	(2,079)	(18,500)
Net change in cash and cash equivalents	11,649	(12,649)
Beginning cash and cash equivalents	12,063	20,035
Ending cash and cash equivalents	23,712	7,386
Supplemental disclosures of cash flow information:
Net cash paid for interest	17,350us-gaap_InterestPaid	12,662us-gaap_InterestPaid
Net cash (received) paid for income taxes	$ (1,685)us-gaap_IncomeTaxesPaidNet	$ 581us-gaap_IncomeTaxesPaidNet

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration