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)
12 Months Ended
May 22, 1993
SAR (ر.س)
km²
Dec. 31, 2018
SAR (ر.س)
shipment
shares
Dec. 31, 2017
SAR (ر.س)
shipment
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   24,600,000 24,500,000            
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 52,562,028 ر.س 0            
Number of shipments of ore generated during the period | shipment   4 2            
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