Business Segment Information - Total Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 2,314,387	$ 2,399,959
Well Intervention [Member]
Segment Reporting Information [Line Items]
Total assets	1,458,029	1,484,109
Robotics [Member]
Segment Reporting Information [Line Items]
Total assets	245,391	274,926
Production Facilities [Member]
Segment Reporting Information [Line Items]
Total assets	152,841	182,007
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 458,126	$ 458,917