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, 2017	Dec. 31, 2016	Dec. 31, 2015
Major Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage			10.70%
Major Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	16.10%	20.40%	26.90%
Major Customer C
Revenue, Major Customer [Line Items]
Concentration risk percentage		11.10%
Major Customer D
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.20%