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Assets Held For Sale (Schedule Of Assets Held For Sale) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items]    
Assets held for sale $ 2,907us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent $ 19,268us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Land And Facilities [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Assets held for sale 288us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_LandAndLandImprovementsMember		 14,627us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_LandAndLandImprovementsMember
Revenue Equipment [Member]    
Long Lived Assets Held-for-sale [Line Items]    
Assets held for sale $ 2,619us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_EquipmentMember		 $ 4,641us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_EquipmentMember