CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
SALES (NOTE 2)	$ 200,890	$ 184,419	$ 649,991	$ 579,874
Costs and Expenses
Cost of sales	(143,261)	(136,983)	(466,167)	(418,421)
Selling and general expenses	(10,800)	(9,936)	(31,304)	(29,771)
Other operating (loss) income, net (Note 15)	(451)	1,771	2,577	3,744
Costs and Expenses, Total	(154,512)	(145,148)	(494,894)	(444,448)
OPERATING INCOME	46,378	39,271	155,097	135,426
Interest expense	(7,838)	(8,553)	(23,992)	(25,600)
Interest and other miscellaneous income, net	495	1,128	4,020	1,650
INCOME BEFORE INCOME TAXES	39,035	31,846	135,125	111,476
Income tax expense (Note 8)	(8,396)	(3,043)	(22,443)	(16,817)
NET INCOME	30,639	28,803	112,682	94,659	$ 161,579
Less: Net income attributable to noncontrolling interest	(7,207)	(4,115)	(12,453)	(9,968)
NET INCOME ATTRIBUTABLE TO RAYONIER INC.	23,432	24,688	100,229	84,691
OTHER COMPREHENSIVE (LOSS) INCOME
Foreign currency translation adjustment, net of income tax expense of $0, $0, $0 and $0	(10,527)	(7,317)	(30,599)	16,599	9,114
Cash flow hedges, net of income tax benefit (expense) of $401, ($614), $2,012 and $534	4,142	(2,162)	21,285	(1,597)	5,693
Amortization of pension and postretirement plans, net of income tax expense of $711, $0, $711 and $0	(542)	116	(204)	349	$ (208)
Total other comprehensive (loss) income	(6,927)	(9,363)	(9,518)	15,351
COMPREHENSIVE INCOME	23,712	19,440	103,164	110,010
Less: Comprehensive income attributable to noncontrolling interest	(4,533)	(2,289)	(4,004)	(13,537)
COMPREHENSIVE INCOME ATTRIBUTABLE TO RAYONIER INC.	$ 19,179	$ 17,151	$ 99,160	$ 96,473
EARNINGS PER COMMON SHARE (Note 11)
Basic earnings per share attributable to Rayonier Inc. (in dollars per share)	$ 0.18	$ 0.19	$ 0.78	$ 0.67
Diluted earnings per share attributable to Rayonier Inc. (in dollars per share)	0.18	0.19	0.77	0.67
Dividends declared per share (in dollars per share)	$ 0.27	$ 0.25	$ 0.79	$ 0.75	$ 1.00