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Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives for Significant Property and Equipment Categories (Detail)	12 Months Ended
	Dec. 31, 2016
Minimum [Member] | Vehicles - Excluding Rail Haul Cars [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Minimum [Member] | Vehicles - Rail Haul Cars [Member]
Property, Plant and Equipment [Line Items]
Useful Life	10 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Minimum [Member] | Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Minimum [Member] | Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Maximum [Member] | Vehicles - Excluding Rail Haul Cars [Member]
Property, Plant and Equipment [Line Items]
Useful Life	10 years
Maximum [Member] | Vehicles - Rail Haul Cars [Member]
Property, Plant and Equipment [Line Items]
Useful Life	20 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	30 years
Maximum [Member] | Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful Life	40 years
Maximum [Member] | Furniture, Fixtures and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful Life	10 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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