CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 60,930us-gaap_NetIncomeLoss	$ 46,529us-gaap_NetIncomeLoss	$ 105,631us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	16,951us-gaap_Depreciation	16,550us-gaap_Depreciation	14,975us-gaap_Depreciation
Amortization of intangibles	21,878us-gaap_AmortizationOfIntangibleAssets	21,786us-gaap_AmortizationOfIntangibleAssets	10,590us-gaap_AmortizationOfIntangibleAssets
Net loss on sale of property, plant and equipment	13	140	203
Loss on debt extinguishment	1,042	1,889	0
Deferred income taxes	16,573us-gaap_DeferredIncomeTaxExpenseBenefit	30,089us-gaap_DeferredIncomeTaxExpenseBenefit	(57,283)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	7,833us-gaap_ShareBasedCompensation	7,480us-gaap_ShareBasedCompensation	5,149us-gaap_ShareBasedCompensation
Accretion of debt discount	4,840us-gaap_AmortizationOfFinancingCosts	4,643us-gaap_AmortizationOfFinancingCosts	2,972us-gaap_AmortizationOfFinancingCosts
Changes in operating assets and liabilities
Accounts receivable	(14,848)	(23,691)	1,180
Inventories	3,116us-gaap_IncreaseDecreaseInInventories	6,260us-gaap_IncreaseDecreaseInInventories	41,696us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(571)	(3,893)	736
Accounts payable and accrued liabilities	(26,787)	18,082	(46,786)
Other, net	1,665	2,805	(3,046)
Net cash provided by operating activities	92,635	128,669	76,017
Cash flows from investing activities
Capital expenditures	(19,957)	(18,352)	(14,916)
Acquisitions, net of cash acquired	0	(15,985)	(364,012)
Proceeds from sale of property, plant and equipment	87	305	607
Other	4,113	2,500	(2,500)
Net cash used in investing activities	(15,757)	(31,532)	(380,821)
Cash flows from financing activities
Proceeds from exercise of stock options	1,921	600	354
Borrowings under revolving credit facilities	806us-gaap_ProceedsFromLinesOfCredit	1,166us-gaap_ProceedsFromLinesOfCredit	206,015us-gaap_ProceedsFromLinesOfCredit
Payments under revolving credit facilities	(806)us-gaap_RepaymentsOfLinesOfCredit	(1,166)us-gaap_RepaymentsOfLinesOfCredit	(271,015)us-gaap_RepaymentsOfLinesOfCredit
Principal payments under capital lease obligations	(1,898)	(1,700)	(1,629)
Proceeds from issuance of convertible senior notes	0wnc_ProceedsFromIssuanceOfSeniorNotes	0wnc_ProceedsFromIssuanceOfSeniorNotes	145,500wnc_ProceedsFromIssuanceOfSeniorNotes
Proceeds from issuance of term loan credit facility, net of issuance costs	0	0	292,500
Principal payments under term loan credit facility	(42,078)	(62,827)	(2,250)
Proceeds from issuance of industrial revenue bond	0us-gaap_ProceedsFromIssuanceOfDebt	0us-gaap_ProceedsFromIssuanceOfDebt	2,500us-gaap_ProceedsFromIssuanceOfDebt
Principal payments under industrial revenue bond	(475)us-gaap_RepaymentsOfDebt	(381)us-gaap_RepaymentsOfDebt	0us-gaap_RepaymentsOfDebt
Debt issuance costs paid	0us-gaap_PaymentsOfDebtIssuanceCosts	(981)us-gaap_PaymentsOfDebtIssuanceCosts	(5,134)us-gaap_PaymentsOfDebtIssuanceCosts
Stock repurchase	(1,497)us-gaap_PaymentsForRepurchaseOfEquity	(35)us-gaap_PaymentsForRepurchaseOfEquity	(564)us-gaap_PaymentsForRepurchaseOfEquity
Proceeds from issuance of common stock, net of expenses	0	0	0
Net cash (used in) provided by financing activities	(44,027)	(65,324)	366,277
Net increase in cash and cash equivalents	32,851	31,813	61,473
Cash and cash equivalents at beginning of year	113,262	81,449	19,976
Cash and cash equivalents at end of year	146,113	113,262	81,449
Cash paid during the period for
Interest	16,136us-gaap_InterestPaidNet	20,913us-gaap_InterestPaidNet	16,050us-gaap_InterestPaidNet
Income taxes	$ 20,220us-gaap_IncomeTaxesPaidNet	$ 941us-gaap_IncomeTaxesPaidNet	$ 594us-gaap_IncomeTaxesPaidNet

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Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ 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.(f))

-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 f

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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

- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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

- Details

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Namespace Prefix:	wnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Proceeds from issuance of common stock net of expenses

+ References

No definition available.

+ Details

Name:	wnc_ProceedsFromIssuanceOfCommonStockNetOfexpenses
Namespace Prefix:	wnc_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Proceeds from issuance of senior notes

+ References

No definition available.

+ Details

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Namespace Prefix:	wnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration