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Fair Value Inputs, Compound Annual Growth Rate Assumption

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Fair Value Inputs, Weighted Average Cost of Capital

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Number of Reporting Units Combined Into a Single Reporting Unit

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Reporting Unit, Change 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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-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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- Definition

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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- Definition

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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- Definition

The number of businesses acquired by the entity during the period.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

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

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- Definition

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, 2016 USD ($) reportingUnit	Oct. 01, 2015	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($) reportingUnit	Dec. 31, 2016 USD ($) business reportingUnit	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounting Policies [Line Items]
Tangible asset impairment charges					$ 11,900,000		$ 0
Definite-lived intangible asset impairment						$ 0	0	$ 12,116,000
Number of reporting units \| reportingUnit						9
Number of businesses acquired \| business						4
Number of reporting units combined into a single reporting unit \| reportingUnit						3
Goodwill			$ 249,120,000			$ 298,619,000	249,120,000
Goodwill impairment			43,500,000			0	43,484,000	51,512,000
Infrastructure Solutions
Accounting Policies [Line Items]
Definite-lived intangible asset impairment								1,200,000
Goodwill			174,456,000			223,425,000	174,456,000
Goodwill impairment								16,100,000
Energy Services
Accounting Policies [Line Items]
Goodwill			46,719,000			$ 46,719,000	46,719,000
Goodwill impairment							33,500,000
Bayou
Accounting Policies [Line Items]
Tangible asset impairment charges					10,900,000
Definite-lived intangible asset impairment					10,900,000
Goodwill			0				0
Bayou Delta
Accounting Policies [Line Items]
Tangible asset impairment charges					$ 400,000
Bayou, Europe, and Asia-Pacific
Accounting Policies [Line Items]
Number of reporting units \| reportingUnit					3
Goodwill impairment					$ 0
Fyfe
Accounting Policies [Line Items]
Goodwill			50,200,000				50,200,000
Fyfe LA
Accounting Policies [Line Items]
Definite-lived intangible asset impairment				$ 1,200,000
CRTS and Bayou
Accounting Policies [Line Items]
Definite-lived intangible asset impairment				0
Energy Services
Accounting Policies [Line Items]
Reporting unit percentage of fair value in excess of carrying amount	9.90%
Reporting unit increase (decrease) in fair value	$ 11,800,000
Goodwill	$ 46,700,000		46,700,000				46,700,000
Goodwill impairment							33,500,000
CRTS
Accounting Policies [Line Items]
Goodwill			$ 4,400,000	$ 14,400,000			4,400,000	14,400,000
Goodwill impairment							10,000,000	5,700,000
Reporting Unit, Utilizing 10.8% Growth
Accounting Policies [Line Items]
Number of reporting units \| reportingUnit	1
Greater Than 30%
Accounting Policies [Line Items]
Number of reporting units \| reportingUnit	3
Reporting unit percentage of fair value in excess of carrying amount	30.00%
Great Than 10%-30%
Accounting Policies [Line Items]
Number of reporting units \| reportingUnit	5
Reporting unit percentage of fair value in excess of carrying amount	10.00%
Great Than 10%-30% \| Maximum
Accounting Policies [Line Items]
Reporting unit percentage of fair value in excess of carrying amount	30.00%
10%
Accounting Policies [Line Items]
Number of reporting units \| reportingUnit	1
Reporting unit percentage of fair value in excess of carrying amount	10.00%
10% \| Minimum
Accounting Policies [Line Items]
Reporting unit percentage of fair value in excess of carrying amount	10.00%
Fyfe Asia \| Infrastructure Solutions
Accounting Policies [Line Items]
Goodwill impairment							$ 16,100,000	$ 29,700,000
Goodwill \| Minimum
Accounting Policies [Line Items]
Significant assumptions used in goodwill review, discount rate	12.00%
Significant assumptions used in goodwill review, annual revenue growth rate	2.20%
Significant assumptions used in goodwill review, long term growth rate	1.00%
Goodwill \| Maximum
Accounting Policies [Line Items]
Significant assumptions used in goodwill review, discount rate	16.00%
Significant assumptions used in goodwill review, annual revenue growth rate	7.20%
Significant assumptions used in goodwill review, long term growth rate	3.50%
Goodwill \| Energy Services
Accounting Policies [Line Items]
Significant assumptions used in goodwill review, annual revenue growth rate	5.40%	2.60%
Significant assumptions used in goodwill review, long term growth rate	2.00%
Reporting unit, increase (decrease) in fair value (percent)	8.80%
Significant assumptions used in goodwill review, weighted average cost of capital	13.00%
Goodwill \| Reporting Unit, Utilizing 10.8% Growth
Accounting Policies [Line Items]
Significant assumptions used in goodwill review, annual revenue growth rate	10.80%
FRANCE \| European Sewer and Water Rehabilitation
Accounting Policies [Line Items]
Tangible asset impairment charges					200,000
MALAYSIA \| Asia-Pacific Sewer and Water Rehabilitation
Accounting Policies [Line Items]
Tangible asset impairment charges					300,000
INDIA \| Asia-Pacific Sewer and Water Rehabilitation
Accounting Policies [Line Items]
Tangible asset impairment charges					$ 100,000