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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign currency translations (Details) | 12 Months Ended |
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Dec. 31, 2018 Rp / RM Rp / ¥ Rp / € Rp / $ Rp / $ | Dec. 31, 2017 Rp / RM Rp / ¥ Rp / € Rp / $ Rp / $
Foreign currency translations |  |
Customer relationship term | 23 years |
Buy | USD |  |
Foreign currency translations |  |
Foreign currency translations | 14,375 | 13,565
Buy | Australian dollar |  |
Foreign currency translations |  |
Foreign currency translations | 10,157 | 10,592
Buy | Euro |  |
Foreign currency translations |  |
Foreign currency translations | Rp / € | 16,432 | 16,231
Buy | Yen |  |
Foreign currency translations |  |
Foreign currency translations | Rp / ¥ | 130.56 | 120.48
Buy | Malaysian ringgits |  |
Foreign currency translations |  |
Foreign currency translations | Rp / RM | 3,474 | 3,349
Sell | USD |  |
Foreign currency translations |  |
Foreign currency translations | 14,385 | 13,570
Sell | Australian dollar |  |
Foreign currency translations |  |
Foreign currency translations | 10,167 | 10,598
Sell | Euro |  |
Foreign currency translations |  |
Foreign currency translations | Rp / € | 16,446 | 16,242
Sell | Yen |  |
Foreign currency translations |  |
Foreign currency translations | Rp / ¥ | 130.70 | 120.55
Sell | Malaysian ringgits |  |
Foreign currency translations |  |
Foreign currency translations | Rp / RM | 3,480 | 3,355

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