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Schedule Of Allowance For Revenue Adjustments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Balance at beginning of period $ 12,215cnw_AllowanceForRevenueAdjustments $ 13,816cnw_AllowanceForRevenueAdjustments $ 16,920cnw_AllowanceForRevenueAdjustments
Additions charged to expense 0cnw_AdditionsChargedToExpense 0cnw_AdditionsChargedToExpense 0cnw_AdditionsChargedToExpense
Additions charged to other accounts - Revenue 94,032cnw_AdditionsChargedToOtherAccountsRevenue 74,481cnw_AdditionsChargedToOtherAccountsRevenue 77,310cnw_AdditionsChargedToOtherAccountsRevenue
Write-offs (89,801)cnw_WriteOffsOfAllowanceForRevenueAdjustments (76,082)cnw_WriteOffsOfAllowanceForRevenueAdjustments (80,414)cnw_WriteOffsOfAllowanceForRevenueAdjustments
Balance at end of period $ 16,446cnw_AllowanceForRevenueAdjustments $ 12,215cnw_AllowanceForRevenueAdjustments $ 13,816cnw_AllowanceForRevenueAdjustments