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Business Segment Information - Summary of financial information concerning reportable segments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,861,489 | $ 1,945,023 | $ 1,809,807
Operating profit (loss) | 275,413 | 442,390 | 482,081
Capital expenditures | 201,681 | 328,936 | 416,400
Depreciation and amortization | 213,128 | 214,899 | 179,905
Identifiable assets | 1,383,860 | 1,367,163 | 1,338,211
Operating Segments | Technical Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,729,732 | 1,794,015 | 1,663,793
Operating profit (loss) | 276,246 | 420,231 | 451,259
Capital expenditures | 167,586 | 277,686 | 369,568
Depreciation and amortization | 181,026 | 183,762 | 152,252
Identifiable assets | 1,113,877 | 1,128,124 | 1,103,341
Operating Segments | Support Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 131,757 | 151,008 | 146,014
Operating profit (loss) | 26,223 | 45,912 | 51,672
Capital expenditures | 32,250 | 46,053 | 42,837
Depreciation and amortization | 31,417 | 30,707 | 27,464
Identifiable assets | 202,243 | 175,611 | 177,974
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  |  |
Operating profit (loss) | (17,685) | (17,654) | (17,019)
Capital expenditures | 1,845 | 5,197 | 3,995
Depreciation and amortization | 685 | 430 | 189
Identifiable assets | 67,740 | 63,428 | 56,896
Loss on disposition of assets, net |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  |  |
Operating profit (loss) | (9,371) | (6,099) | (3,831)
Capital expenditures |  |  |
Depreciation and amortization |  |  |
Identifiable assets |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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