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v2.4.1.9

Segment Information (Summary Of Segment Information) (Details) (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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 553,186 us-gaap_Revenues | $ 551,961 us-gaap_Revenues | $ 542,120 us-gaap_Revenues | $ 492,022 us-gaap_Revenues | $ 517,920 us-gaap_Revenues | $ 511,728 us-gaap_Revenues | $ 506,648 us-gaap_Revenues | $ 492,887 us-gaap_Revenues | $ 2,139,289 us-gaap_Revenues | $ 2,029,183 us-gaap_Revenues | $ 2,036,386 us-gaap_Revenues
Operating Income | 52,627 us-gaap_OperatingIncomeLoss | 41,690 us-gaap_OperatingIncomeLoss | 42,330 us-gaap_OperatingIncomeLoss | 23,441 us-gaap_OperatingIncomeLoss | 36,089 us-gaap_OperatingIncomeLoss | 32,583 us-gaap_OperatingIncomeLoss | 42,361 us-gaap_OperatingIncomeLoss | 28,693 us-gaap_OperatingIncomeLoss | 160,088 us-gaap_OperatingIncomeLoss | 139,726 us-gaap_OperatingIncomeLoss | 171,444 us-gaap_OperatingIncomeLoss
Truckload Transportation Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,702,137 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_TruckloadTransportationServicesSegmentMember | 1,657,854 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_TruckloadTransportationServicesSegmentMember | 1,699,349 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_TruckloadTransportationServicesSegmentMember
Operating Income |  |  |  |  |  |  |  |  | 152,992 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_TruckloadTransportationServicesSegmentMember | 119,597 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_TruckloadTransportationServicesSegmentMember | 153,142 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_TruckloadTransportationServicesSegmentMember
Value Added Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 390,645 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_ValueAddedServicesSegmentMember | 361,384 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_ValueAddedServicesSegmentMember | 324,155 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_ValueAddedServicesSegmentMember
Operating Income |  |  |  |  |  |  |  |  | 7,535 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_ValueAddedServicesSegmentMember | 14,664 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_ValueAddedServicesSegmentMember | 15,999 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_ValueAddedServicesSegmentMember
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 46,588 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_OtherSegmentMember | 11,342 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_OtherSegmentMember | 11,782 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_OtherSegmentMember
Operating Income |  |  |  |  |  |  |  |  | (3,991)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_OtherSegmentMember | 3,947 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_OtherSegmentMember | 1,212 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_OtherSegmentMember
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,803 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_CorporateSegmentMember | 3,081 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_CorporateSegmentMember | 4,322 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_CorporateSegmentMember
Operating Income |  |  |  |  |  |  |  |  | 3,552 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_CorporateSegmentMember | 1,518 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_CorporateSegmentMember | 1,091 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wern_CorporateSegmentMember
Subtotal [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,142,173 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_SubtotalMember | 2,033,661 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_SubtotalMember | 2,039,608 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wern_SubtotalMember
Inter-segment eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (2,884)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (4,478)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (3,222)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

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