Disaggregated Revenue - Schedule of Disaggregates Revenue by Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue by product line	$ 47,458	$ 49,367
Environmental Technologies and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line	7,371	6,900
Oilfield and Industrial Technologies and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line	40,087	42,467
Oilfield and Industrial Technologies and Services | Technology Products and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line	7,189	9,870
Oilfield and Industrial Technologies and Services | Industrial Products and Services
Disaggregation Of Revenue [Line Items]
Revenue by product line	4,727	3,292
Oilfield and Industrial Technologies and Services | Base Ceramic and Sand Proppants
Disaggregation Of Revenue [Line Items]
Revenue by product line	26,665	$ 29,305
Oilfield and Industrial Technologies and Services | Sublease and Rental Income
Disaggregation Of Revenue [Line Items]
Revenue by product line	$ 1,506