Selected Balance Sheet Information (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Inventory for remotely operated vehicles	$ 207,885	$ 190,403
Inventory, Work in Process and Raw Materials	167,703	251,386
Inventory	375,588	441,789
Deferred income taxes	49,809	61,589
Prepaid expenses	79,067	69,625
Other current assets	128,876	131,214
Intangible Assets, Net (Excluding Goodwill)	60,895	68,522
Cash surrender value of life insurance policies	53,653	52,862
Other	13,683	3,262
Other non-current assets	128,231	124,646
Equity Method Investments	32,624	37,462
Payroll and related costs	209,481	218,766
Accrued job costs	79,894	72,117
Deferred revenue, including billings in excess of revenue recognized	116,936	150,246
Other	83,949	75,499
Accounts Payable and Accrued Liabilities, Current		516,628
Deferred tax liabilities	322,758	260,807
Supplemental Executive Retirement Plan	45,423	45,144
Due to Employees, Noncurrent	29,482	26,700
Accrued post-employment benefit obligations	11,349	10,528
Other	15,932	14,793
Accounts Payable and Accrued Liabilities, Noncurrent	424,944	357,972
Medusa Spar LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	32,553	37,376
Other [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 71	$ 86