Segment Information Products and Services (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Consolidated revenues by product line		100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Formation Evaluation and Well Construction [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	55.00%	52.00%	52.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Completion and Production [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	37.00%	40.00%	38.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Drilling Rigs [Member]
Revenue from External Customer [Line Items]
Consolidated revenues by product line	8.00%	8.00%	10.00%