ORGANIZATION (Details) $ in Thousands				1 Months Ended		3 Months Ended	12 Months Ended	88 Months Ended
	Mar. 07, 2016 ILS (₪)	Mar. 02, 2016 ILS (₪)	Mar. 01, 2016 ILS (₪)	Mar. 31, 2016 USD ($)	Mar. 31, 2016 ILS (₪)	Mar. 31, 2017 USD ($) a Portfolios property investment shares	Dec. 31, 2016 USD ($) shares	Mar. 31, 2017 USD ($) a Portfolios property investment shares	Dec. 18, 2015 shares	Oct. 23, 2012 USD ($) shares	Dec. 29, 2011 USD ($) shares	Jan. 08, 2009 shares
Organizational Structure [Line Items]
Common stock, shares authorized						1,000,000,000	1,000,000,000	1,000,000,000
Common stock, shares issued						56,708,525	56,775,767	56,708,525		55,249	220,994
Partnership interest in Operating Partnership						0.10%
Partnership interest in the Operating Partnership and is its sole limited partner						99.90%
Issuance of common stock, value | $						$ 2,924	$ 12,616	$ 561,700
Shares of common stock sold under dividend reinvestment plan, value | $								68,300
Redemptions of common stock, value | $						3,754	38,573	80,800
Common stock, value, issued | $						$ 567	$ 568	$ 567		$ 500	$ 2,000
Number of real estate properties | property						21		21
Number of investments in unconsolidated joint venture | investment						2		2
Number of investments in debt securities | investment						1		1
Office Properties [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						12		12
Number of real estate properties acquired | property						9		9
Office Campus [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						1		1
Office Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties | Portfolios						1		1
Number of real estate properties acquired | Portfolios						1		1
Office Buildings, Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						4		4
Real estate area of undeveloped land | a						25		25
Office Property, Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties acquired | property						3		3
Office/Flex/Industrial Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						1		1
Office/Flex/Industrial Buildings [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						21		21
Retail Properties [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						1		1
Apartment Building [Member]
Organizational Structure [Line Items]
Number of real estate properties | property						2		2
Undeveloped Land [Member]
Organizational Structure [Line Items]
Real estate area of undeveloped land | a						1,670		1,670
Number of investments in real estate | investment						2		2
Series A Debentures [Member] | Bonds Payable [Member]
Organizational Structure [Line Items]
Maximum borrowing capacity | ₪		₪ 1,000,000,000
Interest rate during period				4.25%	4.25%
Proceeds from issuance of debt	₪ 127,700,000		₪ 842,500,000	$ 249,200	₪ 970,200,000
Principal installment payments required as percent of total debt		20.00%
Maximum [Member] | Series A Debentures [Member] | Bonds Payable [Member]
Organizational Structure [Line Items]
Interest rate during period		4.25%
Common Stock [Member]
Organizational Structure [Line Items]
Shares registered in primary offering												100,000,000
Shares registered for sale under dividend reinvestment plan												40,000,000
Issuance of common stock, shares						197,428	938,662	56,584,976
Issuance of common stock, value | $						$ 2	$ 9
Shares of common stock sold under dividend reinvestment plan, shares								6,232,598
Redemptions of common stock, shares						264,670	2,859,010	6,405,292
Redemptions of common stock, value | $						$ 3	$ 28
Common Stock [Member] | Minimum [Member]
Organizational Structure [Line Items]
Stock offering, shares authorized for issuance												250,000
Common Stock [Member] | Maximum [Member]
Organizational Structure [Line Items]
Stock offering, shares authorized for issuance												140,000,000
KBS Strategic Opportunity BVI [Member]
Organizational Structure [Line Items]
Common stock, shares authorized									50,000
KBS Strategic Opportunity BVI [Member] | Operating Partnership [Member]
Organizational Structure [Line Items]
Common stock, shares issued									10,000
KBS Capital Advisors LLC [Member]
Organizational Structure [Line Items]
Shares held by affiliate						20,000		20,000