Selected Balance Sheet Information (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Inventory for remotely operated vehicles	$ 163,539	$ 207,885
Inventory, Work in Process and Raw Materials	164,914	167,703
Inventory	328,453	375,588
Deferred income taxes	57,337	49,809
Prepaid expenses	133,683	79,067
Other current assets	191,020	128,876
Intangible Assets, Net (Excluding Goodwill)	93,701	60,895
Cash surrender value of life insurance policies	55,924	53,653
Other	19,671	6,922
Other non-current assets	218,440	154,094
Equity Method Investments	49,144	32,624
Payroll and related costs	161,228	209,481
Accrued job costs	79,857	79,894
Deferred revenue, including billings in excess of revenue recognized	157,042	116,936
Other	79,157	83,949
Deferred tax liabilities	353,181	322,758
Supplemental Executive Retirement Plan	46,931	45,423
Due to Employees, Noncurrent	15,650	29,482
Accrued post-employment benefit obligations	7,511	11,349
Other	15,737	15,851
Accounts Payable and Accrued Liabilities, Noncurrent	$ 439,010	$ 424,863