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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
The following table presents information about our Named Executive Officers’ pay and Company performance for each of the Company’s three most recently completed fiscal years.
PAY VERSUS PERFORMANCE TABLE
Value of Initial Fixed $100 Investment Based On:
Year
Summary
Compensation
Table Total for
CEO ($) (1)
Compensation
Actually Paid
to CEO($) (1)(2)
Average
Summary
Compensation
Table Total
for Non-CEO
NEOs ($) (3)
Average
Compensation
Actually Paid
to Non-CEO
NEOs ($) (2)(3)
Total
Shareholder
Return ($)
Peer Group
Total
Shareholder
Return ($) (4)
Net
Income ($)
(in 000’s)
Operating
Income ($)
(in 000’s)
20225,460,198 2,465,428 1,094,807 701,308 115 176 245,580 323,076 
20215,314,351 8,798,833 1,133,218 1,587,300 134 215 261,478 309,146 
20204,810,029 6,822,876 1,102,850 1,423,523 109 132 169,078 227,438 
(1)
Represents compensation of Mr. Leathers for all periods presented.
(2)
SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid.” The Reconciliation of Compensation Actually Paid Adjustments table below details the applicable adjustments that were made to determine “compensation actually paid” (all amounts are averages for the non-CEO NEOs).
(3)
Compensation of Messrs. Steele, Nordlund, Schelble, and Johnson are included in the average compensation calculations for all periods presented.
(4)
Our Peer Group includes companies similar to us in the transportation industry and has the following companies: ArcBest; Covenant Logistics Group; Forward Air; Heartland Express; Hub Group; JB Hunt; Knight-Swift Transportation; Landstar System; Marten Transport; Old Dominion Freight Line; Saia; Schneider National; US Xpress; and Yellow Corporation.
   
Named Executive Officers, Footnote [Text Block] Represents compensation of Mr. Leathers for all periods presented.Compensation of Messrs. Steele, Nordlund, Schelble, and Johnson are included in the average compensation calculations for all periods presented.    
Peer Group Issuers, Footnote [Text Block] Our Peer Group includes companies similar to us in the transportation industry and has the following companies: ArcBest; Covenant Logistics Group; Forward Air; Heartland Express; Hub Group; JB Hunt; Knight-Swift Transportation; Landstar System; Marten Transport; Old Dominion Freight Line; Saia; Schneider National; US Xpress; and Yellow Corporation.    
PEO Total Compensation Amount $ 5,460,198 $ 5,314,351 $ 4,810,029
PEO Actually Paid Compensation Amount $ 2,465,428 8,798,833 6,822,876
Adjustment To PEO Compensation, Footnote [Text Block] SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid.” The Reconciliation of Compensation Actually Paid Adjustments table below details the applicable adjustments that were made to determine “compensation actually paid” (all amounts are averages for the non-CEO NEOs).
The following table reconciles total compensation reported in the Summary Compensation Table to “compensation actually paid” for the CEO and non-CEO NEOs (averaged) over the last three years.
RECONCILIATION OF COMPENSATION ACTUALLY PAID ADJUSTMENTS
Year
Summary
Compensation
Table
“Total”
Column ($)
Subtract
Summary
Compensation
Table
“Stock Awards”
Column ($)
Add
Year End
Fair Value of
Unvested
Equity Awards
Granted in Year ($)
Add/ (Subtract)
Year Over Year
Change in
Fair Value of
Unvested
Equity Awards
Granted in
Prior Years ($)
Add/ (Subtract)
Year Over Year
Change in
Fair Value of
Equity Awards
Granted in
Prior Years that
Vested in Year ($)
Compensation
Actually Paid ($)
CEO
20225,460,198 (3,200,000)2,507,777 (2,102,923)(199,624)2,465,428 
20215,314,351 (2,800,000)4,741,960 1,288,523 253,999 8,798,833 
20204,810,029 (2,800,000)4,252,764 302,174 257,909 6,822,876 
Non-CEO NEOs (Average)
20221,094,807 (350,000)274,289 (287,911)(29,877)701,308 
20211,133,218 (312,500)529,187 195,957 41,438 1,587,300 
20201,102,850 (412,500)626,539 49,962 56,672 1,423,523 
    
Non-PEO NEO Average Total Compensation Amount $ 1,094,807 1,133,218 1,102,850
Non-PEO NEO Average Compensation Actually Paid Amount $ 701,308 1,587,300 1,423,523
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid.” The Reconciliation of Compensation Actually Paid Adjustments table below details the applicable adjustments that were made to determine “compensation actually paid” (all amounts are averages for the non-CEO NEOs).
The following table reconciles total compensation reported in the Summary Compensation Table to “compensation actually paid” for the CEO and non-CEO NEOs (averaged) over the last three years.
RECONCILIATION OF COMPENSATION ACTUALLY PAID ADJUSTMENTS
Year
Summary
Compensation
Table
“Total”
Column ($)
Subtract
Summary
Compensation
Table
“Stock Awards”
Column ($)
Add
Year End
Fair Value of
Unvested
Equity Awards
Granted in Year ($)
Add/ (Subtract)
Year Over Year
Change in
Fair Value of
Unvested
Equity Awards
Granted in
Prior Years ($)
Add/ (Subtract)
Year Over Year
Change in
Fair Value of
Equity Awards
Granted in
Prior Years that
Vested in Year ($)
Compensation
Actually Paid ($)
CEO
20225,460,198 (3,200,000)2,507,777 (2,102,923)(199,624)2,465,428 
20215,314,351 (2,800,000)4,741,960 1,288,523 253,999 8,798,833 
20204,810,029 (2,800,000)4,252,764 302,174 257,909 6,822,876 
Non-CEO NEOs (Average)
20221,094,807 (350,000)274,289 (287,911)(29,877)701,308 
20211,133,218 (312,500)529,187 195,957 41,438 1,587,300 
20201,102,850 (412,500)626,539 49,962 56,672 1,423,523 
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
The following graphs illustrate the relationships between each of the financial performance measures included in the Pay Versus Performance Table above and the compensation actually paid to the CEO and, on average, to non-CEO NEOs over the Company’s three most recently completed fiscal years.
wern-20230327_g3.jpg
    
Compensation Actually Paid vs. Net Income [Text Block] wern-20230327_g4.jpg    
Compensation Actually Paid vs. Company Selected Measure [Text Block] wern-20230327_g5.jpg    
Total Shareholder Return Vs Peer Group [Text Block]
The following graphs illustrate the relationships between each of the financial performance measures included in the Pay Versus Performance Table above and the compensation actually paid to the CEO and, on average, to non-CEO NEOs over the Company’s three most recently completed fiscal years.
wern-20230327_g3.jpg
    
Total Shareholder Return Amount $ 115 134 109
Peer Group Total Shareholder Return Amount 176 215 132
Net Income (Loss) $ 245,580,000 $ 261,478,000 $ 169,078,000
Company Selected Measure Amount 323,076,000 309,146,000 227,438,000
PEO Name Mr. Leathers    
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name •Revenues, less fuel surcharge revenues    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name •Operating income    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Diluted earnings per share    
PEO [Member] | Stock Awards Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (3,200,000) $ (2,800,000) $ (2,800,000)
PEO [Member] | Equity Awards Granted in Current Year, Fair Value Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 2,507,777 4,741,960 4,252,764
PEO [Member] | Equity Awards Adjustment, Unvested, Granted in Prior Years [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (2,102,923) 1,288,523 302,174
PEO [Member] | Equity Awards Adjustment, Vested, Granted in Prior Years [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (199,624) 253,999 257,909
Non-PEO NEO [Member] | Stock Awards Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (350,000) (312,500) (412,500)
Non-PEO NEO [Member] | Equity Awards Granted in Current Year, Fair Value Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 274,289 529,187 626,539
Non-PEO NEO [Member] | Equity Awards Adjustment, Unvested, Granted in Prior Years [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (287,911) 195,957 49,962
Non-PEO NEO [Member] | Equity Awards Adjustment, Vested, Granted in Prior Years [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (29,877) $ 41,438 $ 56,672