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Fair Value Measurements (Narrative) (Detail) - $ / gal	Sep. 30, 2018	Dec. 31, 2017
Fair Value [Abstract]
Minimum range of DOE index curve used in DCF model	3.36	2.95
Maximum range of DOE index curve used in DCF model	3.39	3.00
Weighted average DOE index curve used in DCF model	3.38	2.96

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Maximum range of DOE index curve used in DCF model.

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Minimum range of DOE index curve used in DCF model.

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Weighted average Doe index curve used in DCF Model.

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