XML 54 R53.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Property, Plant and Equipment (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2011 Eltmann Plant [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |
Reduction in machinery and equipment |  |  |  |  | $ 11,102
Accumulated Depreciation |  |  |  |  | 9,759
Net Reduction in Property, Plant and Equipment |  | 1,343 |  |  | 1,343
Property Plant and Equipment (Textual) [Abstract] |  |  |  |  |
Addition of Land and Building Total | 1,948 |  |  |  |
Capital Lease Obligation Period | 20 years |  | 20 years |  |
Depreciation expense |  | $ 17,601 | $ 16,996 | $ 18,627 |

X
- Definition Capital lease obligation period. + References No definition available. + Details
Name: | nnbr_CapitalLeaseObligationPeriod
Namespace Prefix: | nnbr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deconsolidation effect reduction of assets property plant and equipment accumulated depreciation. + References No definition available. + Details
Name: | nnbr_DeconsolidationEffectReductionOfAssetsPropertyPlantAndEquipmentAccumulatedDepreciation
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deconsolidation effect reduction of assets property plant and equipment gross. + References No definition available. + Details
Name: | nnbr_DeconsolidationEffectReductionOfAssetsPropertyPlantAndEquipmentGross
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deconsolidation effect reduction of assets property plant and equipment net. + References No definition available. + Details
Name: | nnbr_DeconsolidationEffectReductionOfAssetsPropertyPlantAndEquipmentNet
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | nnbr_PropertyPlantAndEquipmentTextualAbstract
Namespace Prefix: | nnbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration