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, 2018	Dec. 31, 2017
Major Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.70%	16.10%
Major Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.70%	10.20%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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