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

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash outflow to reacquire common and preferred stock. + 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 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + 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 (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + 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 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the 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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- 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 + Details
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- 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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- 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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- 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 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 + Details
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- 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 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Proceeds from issuance of common stock net of expenses + References No definition available. + Details
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