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Net Sales - Summary of Net Sales Disaggregated by Principal Markets (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net sales:        
Net sales $ 140,696 $ 105,033 $ 238,812 $ 188,444
Chemical [Member]        
Net sales:        
Net sales 140,696 105,033 238,812 188,444
Chemical [Member] | Agricultural Products [Member]        
Net sales:        
Net sales 66,508 64,997 111,421 106,455
Chemical [Member] | Industrial Acids and Other Chemical Products [Member]        
Net sales:        
Net sales 60,608 29,559 100,883 64,765
Chemical [Member] | Mining Products [Member]        
Net sales:        
Net sales $ 13,580 $ 10,477 $ 26,508 $ 17,224