STOCK-BASED COMPENSATION (Share-Based Compensation Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
PBF LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 0	$ 0
PBF LLC [Member] | Series A Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants exercised in period	0
Options
Options, beginning balance	612,946	640,779	801,479
Exercised	(126,634)	(27,833)	(160,700)
Forfeited	0	0	0
Options, ending balance	486,312	612,946	640,779	801,479
Options exercisable and vested	486,312	612,946	640,779
Options expected to vest	486,312
Weighted Average Exercise Price
Weighted average exercise price, beginning balance	$ 10.62	$ 10.59	$ 10.53
Exercised	10.17	10.00	10.28
Forfeited	0.00	0.00	0.00
Weighted average exercise price, ending balance	10.73	10.62	10.59	$ 10.53
Weighted average exercise price, exercisable and vested	10.73	$ 10.62	$ 10.59
Weighted average exercise price, expected to vest	$ 10.73
Weighted average remaining contractual term, outstanding	3 years 6 months 6 days	4 years 5 months 20 days	5 years 5 months 15 days	6 years 4 months 28 days
Weighted average remaining contractual term, exercisable and vested	3 years 6 months 8 days	4 years 5 months 20 days	5 years 5 months 15 days
Weighted average remaining contractual term, expected to vest	3 years 6 months 6 days
PBF Energy [Member]
Options
Options, beginning balance	5,970,625	4,256,375	2,401,875
Granted	1,638,075	1,792,000	1,899,500
Exercised	(462,500)	(11,250)	(30,000)
Forfeited	(263,425)	(66,500)	(15,000)
Options, ending balance	6,882,775	5,970,625	4,256,375	2,401,875
Options exercisable and vested	2,958,875	2,271,375	1,136,250
Options expected to vest	6,882,775
Weighted Average Exercise Price
Weighted average exercise price, beginning balance	$ 27.37	$ 27.89	$ 25.97
Granted	26.52	26.18	30.28
Exercised	25.65	25.86	25.79
Forfeited	27.71	28.74	26.38
Weighted average exercise price, ending balance	27.27	27.37	27.89	$ 25.97
Weighted average exercise price, exercisable and vested	27.58	$ 27.23	$ 26.22
Weighted average exercise price, expected to vest	$ 27.27
Weighted average remaining contractual term, outstanding	7 years 9 months 24 days	8 years 7 days	8 years 3 months 26 days	8 years 8 months 2 days
Weighted average remaining contractual term, granted	10 years	10 years	10 years
Weighted average remaining contractual term, exercisable and vested	6 years 8 months 36 days	7 years 2 months 15 days	7 years 7 months 11 days
Weighted average remaining contractual term, expected to vest	7 years 9 months 24 days
Restricted Stock [Member] | PBF Energy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,095,716	521,369	294,880	85,288
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 25.56	$ 24.89	$ 30.87	$ 31.49
Options
Granted	762,425	360,820	247,720
Granted	$ 25.86	$ 22.44	$ 30.97
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(172,978)	(134,331)	(38,128)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share	$ 24.99	$ 31.43	$ 32.84
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(15,100)	0	0
Weighted Average Exercise Price
Forfeited	$ 24.18	$ 0.00	$ 0.00