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Fair Value of Financial Instruments (Narrative) (Detail)
Dec. 31, 2014
Dec. 31, 2013
Fair Value of Financial Instruments [Abstract]    
Minimum range of DOE index curve used in DCF model 2.96wcn_MinimumRangeOfDoeIndexCurveUsedInDcfModel 3.79wcn_MinimumRangeOfDoeIndexCurveUsedInDcfModel
Maximum range of DOE index curve used in DCF model 3.41wcn_MaximumRangeOfDoeIndexCurveUsedInDcfModel 4.00wcn_MaximumRangeOfDoeIndexCurveUsedInDcfModel
Weighted average DOE index curve used in DCF model 3.04wcn_WeightedAverageOfDoeIndexCurveUsedInDcfModel 3.91wcn_WeightedAverageOfDoeIndexCurveUsedInDcfModel