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Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 153,015	$ 161,273
Less accumulated depreciation	(98,609)	(93,146)
Property and equipment, net	54,406	68,127
Construction equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	118,868	121,441
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,511	19,017
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,577	12,771
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,339	3,108
Leasehold improvements (or lease period, if shorter)
Property, Plant and Equipment [Line Items]
Property and equipment, gross	914	914
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	258	313
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,348	3,509
Water rights
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 200	$ 200

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Publisher FASB
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-Section S99
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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