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Contingent Earnout Liabilities (Details) $ in Thousands	1 Months Ended			3 Months Ended	9 Months Ended
	Mar. 31, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2014 USD ($) item	Sep. 30, 2015 USD ($)
Q3 Contracting | 2014 earnout target
Contingent earnout liabilities
Cash paid	$ 5,000
Q3 Contracting | 2013 earnout target
Contingent earnout liabilities
Cash paid			$ 5,000
Vadnais Corporation
Contingent earnout liabilities
Performance targets ( in years)		2 years
Amount of purchase of assets and liabilities		$ 6,354
Contingent consideration in cash		900
Fair value of the contingent consideration		679			$ 368
Contingent consideration credited to non-operating income					396
Vadnais Corporation | 2015 earnout target
Contingent earnout liabilities
Contingent consideration in cash		450
Vadnais Corporation | 2016 earnout target
Contingent earnout liabilities
Contingent consideration in cash		$ 450
Surber, Ram-Fab and Williams
Contingent earnout liabilities
Number of small purchases made | item				3
Amount of purchase of assets and liabilities				$ 8,200
Surber
Contingent earnout liabilities
Contingent consideration in cash				$ 1,400
Contingent earnout period (in years)				3 years
Fair value of the contingent consideration				$ 1,000	$ 1,083
RamFab
Contingent earnout liabilities
Contingent consideration in cash				$ 200
Contingent earnout period (in years)				6 months

X

- Definition

Represents the period of meeting certain operating targets over which the contingent earnout is based, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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Represents the contingent consideration credited to non-operating income upon not meeting earnout target in a business combination.

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Represents the number of division whose assets and liabilities are transferred to PES entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liability recognized arising from contingent consideration in a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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