EARNINGS PER COMMON SHARE (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 39,338	$ 30,773	$ 82,043	$ 65,856	$ 161,579
Less: Net income attributable to noncontrolling interest	3,080	4,612	5,246	5,853
NET INCOME ATTRIBUTABLE TO RAYONIER INC.	$ 36,258	$ 26,161	$ 76,797	$ 60,003
Shares used for determining basic earnings per common share (in shares)	129,067,325	128,548,218	128,935,003	126,081,762
Dilutive effect of:
Stock options (in shares)	103,154	92,513	90,815	99,602
Performance and restricted shares (in shares)	540,808	447,448	606,760	337,862
Shares used for determining diluted earnings per common share (in shares)	129,711,287	129,088,179	129,632,578	126,519,226
Basic earnings per common share attributable to Rayonier Inc. (in dollars per share)	$ 0.28	$ 0.20	$ 0.60	$ 0.48
Diluted earnings per common share attributable to Rayonier Inc. (in dollars per share)	$ 0.28	$ 0.20	$ 0.59	$ 0.47