Schedule of Total Revenue from Major Customers (Detail) - Operating Segment - Oilfield Technologies and Services - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Major Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage		10.70%	22.40%
Major Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	20.40%	26.90%	29.90%
Major Customer C
Revenue, Major Customer [Line Items]
Concentration risk percentage	11.10%