Restructurings - Narrative (Details)	9 Months Ended
	Sep. 30, 2015 geographical_hubs location
Restructuring Cost and Reserve [Line Items]
Crude oil, lowest prices, number of years evaluated	5 years
Percentage reduction in full-time employee base	50.00%
Towed Streamer [Member] | Systems [Member]
Restructuring Cost and Reserve [Line Items]
Number of geographical hubs | geographical_hubs	2
Number of locations	2