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Fair Value Measurements (Narrative) (Detail) - $ / gal	Sep. 30, 2017	Dec. 31, 2016
Fair Value [Abstract]
Minimum range of DOE index curve used in DCF model	2.71	2.61
Maximum range of DOE index curve used in DCF model	2.80	2.78
Weighted average DOE index curve used in DCF model	2.74	2.75

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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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