Annual report pursuant to Section 13 and 15(d)

AMAK SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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AMAK SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
ر.س in Thousands
12 Months Ended
Dec. 31, 2018
SAR (ر.س)
ر.س / $
Dec. 31, 2017
SAR (ر.س)
Dec. 31, 2016
SAR (ر.س)
Jun. 30, 1986
Property, Plant and Equipment [Line Items]        
Foreign exchange rate (SR per USD) | ر.س / $ 3.75      
AMAK        
Property, Plant and Equipment [Line Items]        
Interest rate on pre-export advances 2.50%      
Operating lease expense | ر.س ر.س 1,619 ر.س 1,454 ر.س 442  
Zakat tax rate 2.50%      
Non-Saudi tax rate 20.00%      
AMAK | Riyals        
Property, Plant and Equipment [Line Items]        
Foreign exchange rate (SR per USD)       3.75
AMAK | Other assets | Minimum        
Property, Plant and Equipment [Line Items]        
Useful life 3 years      
AMAK | Other assets | Maximum        
Property, Plant and Equipment [Line Items]        
Useful life 20 years