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Subsequent Events - Additional Information (Detail) - New Senior Credit Facilities [Member] - USD ($)	Oct. 01, 2016	Sep. 30, 2016
Subsequent Event [Line Items]
Senior secured revolving credit facility current borrowing capacity		$ 100,000,000
Senior secured revolving credit facility maximum borrowing capacity		133,000,000
Debt threshold limit after amendment		39,900,000
Debt issuance costs		$ 3,700,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Senior secured revolving credit facility current borrowing capacity	$ 133,000,000
Senior secured revolving credit facility maximum borrowing capacity	143,000,000
Debt threshold limit after amendment	42,900,000
Debt issuance costs	$ 300,000
Debt instrument threshold drawn percentage	30.00%

X

- Definition

Debt instrument threshold drawn percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnbr_
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Balance Type:	na
Period Type:	duration

X

- Definition

Debt instrument threshold limit under amended facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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