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Acquisitions (Identifiable Intangible Assets Acquired) (Details) - USD ($) $ in Thousands | Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015
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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-compete 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 |  | $ 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

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