Selected Balance Sheet Information (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Inventory for remotely operated vehicles	$ 118,236	$ 163,539
Inventory, Work in Process and Raw Materials	161,894	164,914
Inventory	280,130	328,453
Deferred income taxes	0	57,337
Prepaid expenses	42,523	133,683
Other current assets	42,523	191,020
Intangible Assets, Net (Excluding Goodwill)	87,801	93,701
Investments and Other Noncurrent Assets	59,130
Cash surrender value of life insurance policies	60,160	55,924
Equity Method Investments	39,826	49,144
Deferred Income Tax Assets, Net	12,187	0
Other	11,807	19,671
Other non-current assets	270,911	218,440
Payroll and related costs	141,485	161,228
Accrued job costs	59,331	79,857
Deferred revenue, including billings in excess of revenue recognized	122,223	157,042
Accrued Income Taxes, Current	35,126	20,395
Other	72,606	79,157
Accrued Liabilities, Current	430,771	497,679
Deferred tax liabilities	236,113	353,181
Supplemental Executive Retirement Plan	49,163	46,931
Long-Term Incentive Plan	0	15,650
Accrued post-employment benefit obligations	4,648	7,511
Other	22,326	15,737
Accounts Payable and Accrued Liabilities, Noncurrent	312,250	439,010
Angola Member
Schedule of Equity Method Investments [Line Items]
Investments and Other Noncurrent Assets	$ 59,130	$ 0