COMMITMENTS AND CONTINGENCIES (Details)						6 Months Ended	12 Months Ended
	May 18, 2018 USD ($)	Feb. 01, 2018 USD ($)	Jan. 13, 2017 group	Jul. 01, 2016 USD ($)	Mar. 01, 2011	Jun. 30, 2018 USD ($) ppm	Dec. 31, 2010 ppm	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Percent of tax benefit received from increases in tax basis paid to stockholders						85.00%
Class A Common Stock [Member] | PBF Energy [Member]
Loss Contingencies [Line Items]
Percentage of ownership in PBF LLC						99.00%		96.70%
Environmental Issue [Member]
Loss Contingencies [Line Items]
Environmental liability						$ 11,448,000		$ 10,282,000
Discount rate used for environmental liability assessment						8.00%
Loss Contingency, Number Of Environmental Groups Appealing Permits | group			2
Maximum amount of sulfur allowed in heating oil (in ppm) | ppm						10
Public Utilities, Description of Specific Regulatory Liabilities						80
Environmental Issue [Member] | New York [Member]
Loss Contingencies [Line Items]
Maximum amount of sulfur allowed in heating oil (in ppm) | ppm							15
Environmental Issue [Member] | PENNSYLVANIA
Loss Contingencies [Line Items]
Maximum amount of sulfur allowed in heating oil (in ppm) | ppm							500
Environmental Issue [Member] | Chalmette Refinery [Member]
Loss Contingencies [Line Items]
Term of insurance policies						10 years
Environmental Costs Recognized, Recovery Credited to Expense						$ 3,936,000
Accrual For Environmental Loss Contingencies, Expected Payment Period						30 years
Environmental Insurance Policies Coverage						$ 100,000,000
Environmental Issue [Member] | Valero [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Site Contingency, Loss Exposure Not Accrued, Best Estimate						$ 20,000,000
Environmental Issue [Member] | PBF Energy and Valero [Member]
Loss Contingencies [Line Items]
Term of insurance policies						10 years
Environmental Issue [Member] | PBF Energy and Valero [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Site Contingency, Loss Exposure Not Accrued, Best Estimate						$ 75,000,000
Environmental Issue [Member] | Sunoco, Inc. [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Insurance-Related Assessment, Expiration Of Liability Period					20 years
Environmental Issue [Member] | Torrance Refinery [Member]
Loss Contingencies [Line Items]
Environmental liability						133,928,000		$ 136,487,000
Term of insurance policies				10 years
Environmental Issue [Member] | Torrance Refinery [Member] | California Department of Toxic Substance Control [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value						150,000
Environmental Issue [Member] | Torrance Refinery [Member] | Other [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value						100,000
Environmental Issue [Member] | Torrance Refinery [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Site Contingency, Loss Exposure Not Accrued, Best Estimate				$ 100,000,000
Environmental Remediation Contingency [Domain] | Settled Litigation [Member] | Louisiana Department of Environmental Quality [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 741,000
Loss Contingency, Damages Paid, Value	$ 100,000
Environmental Remediation Contingency [Domain] | Pending Litigation [Member] | Environmental Protection Agency [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value		$ 645,000
Environmental Remediation Contingency [Domain] | Pending Litigation [Member] | SCAQMD [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value						$ 150,000