Annual report pursuant to Section 13 and 15(d)

AMAK ORGANIZATION AND BUSINESS - Narrative (Details)

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AMAK ORGANIZATION AND BUSINESS - Narrative (Details)
ر.س / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Oct. 02, 2019
USD ($)
Oct. 02, 2019
SAR (ر.س)
May 22, 1993
SAR (ر.س)
km²
Mar. 31, 2019
SAR (ر.س)
shares
Dec. 31, 2019
SAR (ر.س)
shares
Dec. 31, 2018
SAR (ر.س)
shares
Dec. 31, 2016
SAR (ر.س)
ر.س / shares
shares
Dec. 31, 2015
SAR (ر.س)
shares
Dec. 31, 2013
SAR (ر.س)
ر.س / shares
shares
Dec. 31, 2011
SAR (ر.س)
ر.س / shares
shares
Oct. 31, 2018
ر.س / shares
shares
Dec. 31, 2009
SAR (ر.س)
share_bundle
shares
Schedule of Equity Method Investments [Line Items]                        
Authorized capital (in shares) | shares         40,000,000 40,000,000            
Issued capital (in shares) | shares         24,800,000 24,600,000            
AMAK                        
Schedule of Equity Method Investments [Line Items]                        
Authorized capital (in shares) | shares                       450,000,000
Authorized capital, number of share bundles | share_bundle                       45,000,000
Authorized capital, number of shares per bundle | shares           10 10 10 10 10   10
Capital issued for cash (as a percent)                       50.00%
Capital issued for contribution of mining rights and assets (as a percent)                       50.00%
Increase to authorized share capital (SR)           ر.س 40,000,000 ر.س 40,000,000 ر.س 190,000,000 ر.س 50,000,000 ر.س 50,000,000    
Authorized share capital (SR)           ر.س 820,000,000 ر.س 780,000,000 ر.س 740,000,000 ر.س 550,000,000 ر.س 500,000,000    
Issued capital (in shares) | shares           4,000,000 4,000,000 19,000,000 5,000,000 5,000,000    
Price per share (SR per share) | ر.س / shares             ر.س 20   ر.س 30 ر.س 28    
Share premium (SR)             ر.س 35,092,840   ر.س 100,000,000 ر.س 90,000,000    
Increase to share premium for shares that were previously issued (SR)           ر.س 2,453,580            
Approved repurchase amount (in shares) | shares                     2,500,000  
Approved repurchase price (SR per share) | ر.س / shares                     ر.س 30  
Advances to shareholders (SR)         ر.س 2,859,341 ر.س 52,562,028            
Stock repurchases during period (in shares) | shares       2,490,445                
Stock repurchased (SR)       ر.س 74,713,000 ر.س 74,713,350              
Trecora | Loan payable | Loan due to the Ministry of Finance and National Economy                        
Schedule of Equity Method Investments [Line Items]                        
Aggregate amount                       ر.س 41,250,000
Trecora | Al Masane mine                        
Schedule of Equity Method Investments [Line Items]                        
Mining rights, term     30 years                  
Mining rights, renewal period     20 years                  
Area of mine (in square kilometers) | km²     44                  
Surface rental per square kilometer per year     ر.س 10,000                  
Surface rental per year     ر.س 440,000                  
AMAK                        
Schedule of Equity Method Investments [Line Items]                        
Amount of investment sold $ 70.0 ر.س 264,700,000                    
Non-refundable deposit of amount sold, percentage 5.00% 5.00%                    
Proceeds from sale of investment | $ $ 3.5                      
AMAK | AMAK                        
Schedule of Equity Method Investments [Line Items]                        
Proceeds from sale of investment   ر.س 2,855,000