Business Segment Information (Intercompany Segment Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Assets	$ 2,559,995	$ 2,544,280
Well Intervention [Member]
Segment Reporting Information [Line Items]
Assets	1,308,535	1,245,229
Robotics [Member]
Segment Reporting Information [Line Items]
Assets	289,806	282,373
Subsea Construction [Member]
Segment Reporting Information [Line Items]
Assets	2,614	38,054
Production Facilities [Member]
Segment Reporting Information [Line Items]
Assets	482,184	495,829
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 476,856	$ 482,795