Acquisitions (Identifiable Intangible Assets Acquired) (Details) - USD ($) $ in Thousands		Nov. 23, 2015	Mar. 13, 2015	Jan. 13, 2015	Dec. 30, 2014	Oct. 29, 2014	Jul. 07, 2014
TEW Plus LTD [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		$ 1,074
TEW Plus LTD [Member] | Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		0
TEW Plus LTD [Member] | Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		817
TEW Plus LTD [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		203
TEW Plus LTD [Member] | Non-competition agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets		$ 54
Inspection Oilfield Services (IOS) [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets	[1],[2]		$ 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-competition 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-competition 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-competition 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-competition 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-competition agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value estimate of acquired identifiable intangible assets							$ 124

[1] See Note 4 Goodwill and Other Intangible Assets, and Note 7 Property, Plant, and Equipment, with respect to an impairment of property, plant, and equipment, intangible assets, and goodwill related to this acquisition.

[2] See Note 4 Goodwill and Other Intangible Assets, with respect to an impairment of intangible assets related to this acquisition.