The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: 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=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_DepreciationAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.9)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 9

-Article 9

+ Details

Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_OtherNonoperatingIncomeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=wnc_ExternalCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=wnc_IntersegmentSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=wnc_CommercialVehicleSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=wnc_OtherProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=wnc_RetailMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Reportable Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales
Total net sales	$ 527,477us-gaap_SalesRevenueNet	$ 491,697us-gaap_SalesRevenueNet	$ 486,021us-gaap_SalesRevenueNet	$ 358,120us-gaap_SalesRevenueNet	$ 458,354us-gaap_SalesRevenueNet	$ 439,977us-gaap_SalesRevenueNet	$ 413,126us-gaap_SalesRevenueNet	$ 324,229us-gaap_SalesRevenueNet	$ 415,847us-gaap_SalesRevenueNet	$ 405,917us-gaap_SalesRevenueNet	$ 362,408us-gaap_SalesRevenueNet	$ 277,682us-gaap_SalesRevenueNet	$ 1,863,315us-gaap_SalesRevenueNet	$ 1,635,686us-gaap_SalesRevenueNet	$ 1,461,854us-gaap_SalesRevenueNet
Depreciation and amortization													38,829us-gaap_DepreciationAndAmortization	38,336us-gaap_DepreciationAndAmortization	25,565us-gaap_DepreciationAndAmortization
Income (Loss) from operations													122,386us-gaap_OperatingIncomeLoss	103,191us-gaap_OperatingIncomeLoss	70,484us-gaap_OperatingIncomeLoss
Reconciling items to net income
Interest expense													(22,165)us-gaap_InterestExpense	(26,308)us-gaap_InterestExpense	(21,724)us-gaap_InterestExpense
Other, net													(1,759)us-gaap_OtherNonoperatingIncomeExpense	740us-gaap_OtherNonoperatingIncomeExpense	(97)us-gaap_OtherNonoperatingIncomeExpense
Income tax expense													37,532us-gaap_IncomeTaxExpenseBenefit	31,094us-gaap_IncomeTaxExpenseBenefit	(56,968)us-gaap_IncomeTaxExpenseBenefit
Net income													98,462	77,623	48,663
External customers
Net sales
Total net sales													1,863,315	1,635,686	1,461,854
Intersegment sales
Net sales
Total net sales													0	0	0
Corporate and Eliminations
Net sales
Total net sales													(87,167)	(86,929)	(81,639)
Depreciation and amortization													1,630	1,860	2,812
Income (Loss) from operations													(17,419)	(16,363)	(29,253)
Corporate and Eliminations \| External customers
Net sales
Total net sales													0	0	0
Corporate and Eliminations \| Intersegment sales
Net sales
Total net sales													(87,167)	(86,929)	(81,639)
Commercial Trailer Products
Net sales
Total net sales													1,294,164	1,082,454	1,064,591
Depreciation and amortization													11,332	11,127	11,658
Income (Loss) from operations													81,141	57,543	52,242
Commercial Trailer Products \| External customers
Net sales
Total net sales													1,221,040	1,010,736	995,164
Commercial Trailer Products \| Intersegment sales
Net sales
Total net sales													73,124	71,718	69,427
Diversified Products
Net sales
Total net sales													466,238	458,675	321,257
Depreciation and amortization													23,806	23,320	10,385
Income (Loss) from operations													54,879	59,126	44,573
Diversified Products \| External customers
Net sales
Total net sales													453,160	444,804	309,680
Diversified Products \| Intersegment sales
Net sales
Total net sales													13,078	13,871	11,577
Retail
Net sales
Total net sales													190,080	181,486	157,645
Depreciation and amortization													2,061	2,029	710
Income (Loss) from operations													3,785	2,885	2,922
Retail \| External customers
Net sales
Total net sales													189,115	180,146	157,010
Retail \| Intersegment sales
Net sales
Total net sales													$ 965	$ 1,340	$ 635