Business Segment Information (Intercompany Segment Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 2,511,906	$ 3,386,580
Well Intervention [Member]
Segment Reporting Information [Line Items]
Assets	1,191,001	936,926
Robotics [Member]
Segment Reporting Information [Line Items]
Assets	276,057	258,117
Subsea Construction [Member]
Segment Reporting Information [Line Items]
Assets	57,623	303,479
Production Facilities [Member]
Segment Reporting Information [Line Items]
Assets	491,535	504,828
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets	495,690	483,003
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Assets		$ 900,227