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Acquisitions (Identifiable Intangible Assets Acquired) (Details) - USD ($) $ in Thousands | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014
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Inspection Oilfield Services (IOS) [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets | $ 50,354 |  |  |  |
Inspection Oilfield Services (IOS) [Member] | Trade name [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 2,641 |  |  |  |
Inspection Oilfield Services (IOS) [Member] | Customer relationships [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 41,171 |  |  |  |
Inspection Oilfield Services (IOS) [Member] | Technology [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 4,364 |  |  |  |
Inspection Oilfield Services (IOS) [Member] | Non-compete agreements [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets | $ 2,178 |  |  |  |
Tew Holdings, LTD [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | $ 14,048 |  |  |
Tew Holdings, LTD [Member] | Trade name [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 870 |  |  |
Tew Holdings, LTD [Member] | Customer relationships [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 10,035 |  |  |
Tew Holdings, LTD [Member] | Technology [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 2,480 |  |  |
Tew Holdings, LTD [Member] | Non-compete agreements [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | $ 663 |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | $ 33,130 |  |
Chemtec Energy Services, LLC [Member] | Trade name [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 3,149 |  |
Chemtec Energy Services, LLC [Member] | Customer relationships [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 23,934 |  |
Chemtec Energy Services, LLC [Member] | Technology [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 4,930 |  |
Chemtec Energy Services, LLC [Member] | Non-compete agreements [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | $ 1,117 |  |
FWO [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | $ 419 |
FWO [Member] | Trade name [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 0 |
FWO [Member] | Customer relationships [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 34 |
FWO [Member] | Technology [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 341 |
FWO [Member] | Non-compete agreements [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | $ 44 |
Carr Concrete [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  |  | $ 1,348
Carr Concrete [Member] | Trade name [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  |  | 613
Carr Concrete [Member] | Customer relationships [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  |  | 524
Carr Concrete [Member] | Technology [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  |  | 87
Carr Concrete [Member] | Non-compete agreements [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  |  | $ 124

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