STOCK-BASED COMPENSATION (Share-Based Compensation Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
PBF Energy [Member]
Options
Options, beginning balance (in shares)	6,882,775	5,970,625	4,256,375
Granted (in shares)	2,500,742	1,638,075	1,792,000
Exercised (in shares)	(884,878)	(462,500)	(11,250)
Forfeited (in shares)	(141,981)	(263,425)	(66,500)
Options, ending balance (in shares)	8,356,658	6,882,775	5,970,625	4,256,375
Options exercisable and vested (in shares)	3,531,066	2,958,875	2,271,375
Options expected to vest (in shares)	8,356,658
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in dollars per share)	$ 27.27	$ 27.37	$ 27.89
Granted (in dollars per share)	35.25	26.52	26.18
Exercised (in dollars per share)	27.57	25.65	25.86
Forfeited (in dollars per share)	33.49	27.71	28.74
Weighted average exercise price, ending balance (in dollars per share)	29.60	27.27	27.37	$ 27.89
Weighted average exercise price, exercisable and vested (in dollars per share)	27.39	$ 27.58	$ 27.23
Weighted average exercise price, expected to vest (in dollars per share)	$ 29.60
Weighted average remaining contractual term, outstanding (in years)	7 years 5 months 23 days	7 years 9 months 24 days	8 years 7 days	8 years 3 months 25 days
Weighted average remaining contractual term, granted (in years)	10 years	10 years	10 years
Weighted average remaining contractual term, exercisable and vested (in years)	6 years 3 months 7 days	6 years 8 months 38 days	7 years 2 months 15 days
Weighted average remaining contractual term, expected to vest (in years)	7 years 5 months 23 days
PBF LLC [Member] | Series A Units [Member]
Options
Options, beginning balance (in shares)	486,312	612,946	640,779
Granted (in shares)	0	0	0
Exercised (in shares)	(243,700)	(126,634)	(27,833)
Options, ending balance (in shares)	242,612	486,312	612,946	640,779
Options exercisable and vested (in shares)	242,612	486,312	612,946
Options expected to vest (in shares)	242,612
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in dollars per share)	$ 10.73	$ 10.62	$ 10.59
Exercised (in dollars per share)	10.62	10.17	10.00
Weighted average exercise price, ending balance (in dollars per share)	10.85	10.73	10.62	$ 10.59
Weighted average exercise price, exercisable and vested (in dollars per share)	10.85	$ 10.73	$ 10.62
Weighted average exercise price, expected to vest (in dollars per share)	$ 10.85
Weighted average remaining contractual term, outstanding (in years)	2 years 7 months 20 days	3 years 6 months 7 days	4 years 5 months 20 days	5 years 5 months 15 days
Weighted average remaining contractual term, exercisable and vested (in years)	2 years 7 months 20 days	3 years 6 months 7 days	4 years 5 months 20 days
Weighted average remaining contractual term, expected to vest (in years)	2 years 7 months 20 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 (in shares)	793,954	1,095,716	521,369	294,880
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 26.88	$ 25.56	$ 24.89	$ 30.87
Options
Granted (in shares)	58,830	762,425	360,820
Granted (in dollars per share)	$ 47.24	$ 25.86	$ 22.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	345,073	172,978	(134,331)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share (in dollars per share)	$ 26.13	$ 24.99	$ 31.43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	15,519	(15,100)	0
Weighted Average Exercise Price
Forfeited (in dollars per share)	$ 24.18	$ 24.18	$ 0.00