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- Definition

Fair Value Inputs, Compound Annual Growth Rate Assumption

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Reporting Unit, Increase (Decrease) in Fair Value, Percent

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Reporting Unit, Increase (Decrease) in Fair Value, Value

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Percentage of fair value of reporting unit in excess of carrying amount.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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Accounting Policies - Impairment (Details)			3 Months Ended		12 Months Ended
Accounting Policies - Impairment (Details)	Oct. 01, 2017 reportingUnit	Oct. 01, 2016	Sep. 30, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Line Items]
Definite-lived intangible asset impairment					$ 41,032,000	$ 0	$ 0
Tangible asset impairment charges							0
Goodwill impairment					45,390,000	0	43,484,000
Goodwill				$ 249,120,000	260,715,000	298,619,000	249,120,000
Number of reporting units \| reportingUnit	7
Infrastructure Solutions
Accounting Policies [Line Items]
Goodwill impairment			$ 45,400,000		45,390,000
Goodwill				174,456,000	185,027,000	223,425,000	174,456,000
Energy Services
Accounting Policies [Line Items]
Goodwill impairment					0		33,500,000
Goodwill				46,719,000	46,719,000	$ 46,719,000	46,719,000
Fyfe
Accounting Policies [Line Items]
Reporting unit percentage of fair value in excess of carrying amount			45.00%
Reporting unit increase (decrease) in fair value			$ (105,200,000)
Reporting unit, increase (decrease) in fair value (percent)			(65.30%)
Significant assumptions used in goodwill review, discount rate		16.00%	17.00%
Significant assumptions used in goodwill review, long term growth rate		3.50%	2.50%
Significant assumptions used in goodwill review, annual revenue growth rate		4.00%	10.80%
Goodwill					$ 9,600,000
Energy Services
Accounting Policies [Line Items]
Goodwill impairment				33,500,000
Goodwill				46,700,000			46,700,000
CRTS
Accounting Policies [Line Items]
Goodwill impairment				10,000,000
Goodwill				$ 4,400,000			$ 4,400,000
10% \| Minimum
Accounting Policies [Line Items]
Reporting unit percentage of fair value in excess of carrying amount	10.00%
Goodwill \| Minimum
Accounting Policies [Line Items]
Significant assumptions used in goodwill review, discount rate	12.00%
Significant assumptions used in goodwill review, long term growth rate	1.00%
Significant assumptions used in goodwill review, annual revenue growth rate	1.40%
Goodwill \| Maximum
Accounting Policies [Line Items]
Significant assumptions used in goodwill review, discount rate	17.00%
Significant assumptions used in goodwill review, long term growth rate	3.00%
Significant assumptions used in goodwill review, annual revenue growth rate	5.80%