Annual report pursuant to Section 13 and 15(d)

AMAK Organization and Business - Narrative (Details)

v3.20.4
AMAK Organization and Business - Narrative (Details)
ر.س / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 10, 2020
SAR (ر.س)
shares
Apr. 01, 2020
SAR (ر.س)
Mar. 26, 2020
SAR (ر.س)
Mar. 26, 2020
USD ($)
Oct. 02, 2019
SAR (ر.س)
Sep. 22, 2019
SAR (ر.س)
Sep. 22, 2019
USD ($)
May 22, 1993
SAR (ر.س)
km²
Sep. 30, 2020
SAR (ر.س)
Sep. 30, 2020
USD ($)
Mar. 31, 2019
SAR (ر.س)
shares
Sep. 28, 2020
Dec. 31, 2020
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 0 ر.س 2,859,341              
Stock repurchases during period (in shares) | shares                     2,490,445                    
Stock repurchased (SR)                     ر.س 74,713,000   ر.س 57,095,550 ر.س 74,713,350              
Non refundable deposit forfeited percentage                       50.00%                  
Non refundable deposit forfeited   ر.س 1,429,726                                      
Stock issued during period, shares (in shares) | shares 5,709,555                                        
Purchase of assets ر.س 57,095,550                                        
Capital gain obligations ر.س 7,878,000                                        
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         ر.س 264,700,000                                
Non-refundable deposit of amount sold, percentage         5.00%       5.00% 5.00%                      
Proceeds from sale of investment     ر.س 40,000,000 $ 10.7   ر.س 265,000,000 $ 70.0   ر.س 224,000,000 $ 59.9                      
AMAK | AMAK                                          
Schedule of Equity Method Investments [Line Items]                                          
Proceeds from sale of investment         ر.س 2,855,000