ORGANIZATION (Details) $ in Thousands										1 Months Ended	12 Months Ended				121 Months Ended
	Feb. 16, 2020 USD ($)	Nov. 01, 2019	Mar. 20, 2019 USD ($)	Mar. 08, 2016 ILS (₪)	Mar. 08, 2016 USD ($)	Mar. 08, 2016 ILS (₪)	Mar. 07, 2016 ILS (₪)	Mar. 02, 2016 ILS (₪)	Mar. 01, 2016 ILS (₪)	Mar. 31, 2016	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) a investment property portfolio shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 USD ($) a investment property portfolio shares	Feb. 16, 2020 ILS (₪)	Dec. 18, 2015 certificate shares	Oct. 23, 2012 USD ($) shares	Dec. 29, 2011 USD ($) shares	Jan. 08, 2009 shares
Organizational Structure [Line Items]
Common stock, shares authorized (in shares)												1,000,000,000	1,000,000,000		1,000,000,000
Common stock, shares issued (in shares)												65,866,765	66,822,861		65,866,765			55,249	220,994
Period of termination of advisory agreement without cause or penalty		30 days
Period of termination of renewal of advisory agreement without cause or penalty		90 days
Issuance of common stock | $												$ 835	$ 1,418	$ 8,666
Shares of common stock sold under dividend reinvestment plan | $															$ 76,300
Redemptions of common stock | $			$ 8,600									$ 10,028	123,613	$ 74,780	$ 285,400
Common stock, special dividends, amount of shares issued												25,976,746			25,976,746
Common stock, value, issued | $												$ 659	$ 668		$ 659			$ 500	$ 2,000
Number of investments in unconsolidated joint venture | investment												5			5
Number of investments in equity securities | investment												3			3
Office Properties
Organizational Structure [Line Items]
Number of real estate properties | property												6			6
Office Portfolio
Organizational Structure [Line Items]
Number of real estate properties | portfolio												1			1
Office Buildings, Portfolio
Organizational Structure [Line Items]
Number of real estate properties | property												4			4
Undeveloped Land, Portfolio
Organizational Structure [Line Items]
Real estate area of undeveloped land | a												14			14
Apartment Properties, Portfolio
Organizational Structure [Line Items]
Number of real estate properties | property												1			1
Undeveloped Land
Organizational Structure [Line Items]
Real estate area of undeveloped land | a												1,000			1,000
Number of investments in real estate | investment												3			3
Pacific Oak SOR (BVI) Holdings, Ltd. Series A Debentures | Bonds Payable
Organizational Structure [Line Items]
Maximum borrowing capacity | ₪								₪ 1,000,000,000
Contractual interest rate, percentage								4.25%
Interest rate during period										4.25%
Proceeds from issuance of debt				₪ 970,200,000	$ 249,200	₪ 970,200,000	₪ 127,700,000		₪ 842,500,000
Pacific Oak SOR (BVI) Holdings, Ltd. Series B Debentures | Bonds Payable | Subsequent Event
Organizational Structure [Line Items]
Maximum borrowing capacity	$ 74,100															₪ 254,100,000
Contractual interest rate, percentage	3.93%															3.93%
Principal of installment payments as percent of face amount	33.33%
Maximum | Subsequent Event
Organizational Structure [Line Items]
Shares of common stock sold under dividend reinvestment plan | $											$ 800
Maximum | Pacific Oak SOR (BVI) Holdings, Ltd. Series A Debentures | Bonds Payable
Organizational Structure [Line Items]
Contractual interest rate, percentage								4.25%
Interest rate during period								4.25%
Common Stock
Organizational Structure [Line Items]
Shares registered in primary offering (in shares)																				100,000,000
Shares registered for sale under dividend reinvestment plan (in shares)																				40,000,000
Issuance of common stock (in shares)												84,248	123,264	585,192	56,584,976
Issuance of common stock | $												$ 1	$ 1	$ 6	$ 561,700
Shares of common stock sold under dividend reinvestment plan (in shares)															6,827,324
Redemptions of common stock (in shares)												1,040,344	11,330,966	5,307,142	23,819,074
Redemptions of common stock | $												$ 10	$ 113	$ 53
Common Stock | Minimum
Organizational Structure [Line Items]
Stock offering, shares authorized for issuance (in shares)																				250,000
Common Stock | Maximum
Organizational Structure [Line Items]
Stock offering, shares authorized for issuance (in shares)																				140,000,000
Operating Partnership
Organizational Structure [Line Items]
Partnership interest in operating partnership												0.10%
Partnership interest in the operating partnership and is its sole limited partner												99.90%
Pacific Oak Strategic Opportunity BVI
Organizational Structure [Line Items]
Common stock, shares authorized (in shares)																	50,000
Number of certificates issued | certificate																	1
Pacific Oak Strategic Opportunity BVI | Pacific Oak Strategic Opportunity Limited Partnership
Organizational Structure [Line Items]
Common stock, shares issued (in shares)																	10,000