ORGANIZATION (Details) $ in Thousands				1 Months Ended		3 Months Ended	12 Months Ended	70 Months Ended	76 Months Ended
	Mar. 07, 2016 ILS (₪)	Mar. 02, 2016 ILS (₪)	Mar. 01, 2016 ILS (₪)	Mar. 31, 2016 USD ($) a Portfolios property Investments shares	Mar. 31, 2016 ILS (₪)	Mar. 31, 2016 USD ($) a Portfolios property Investments shares	Dec. 31, 2015 USD ($) shares	Sep. 30, 2015 USD ($) shares	Mar. 31, 2016 USD ($) a Portfolios property Investments shares	Dec. 18, 2015 shares	Oct. 23, 2012 USD ($) 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		1,000,000,000
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 | $						$ 3,201	$ 13,573	$ 561,700
Shares of common stock sold under dividend reinvestment plan, value | $									$ 56,000
Redemptions of common stock, value | $						$ 3,412	$ 30,100		$ 41,800
Common stock, shares issued				58,678,256		58,678,256	58,696,115		58,678,256		55,249	220,994
Common stock, value, issued | $				$ 587		$ 587	$ 587		$ 587		$ 500	$ 2,000
Real estate area of undeveloped land | a				1,670		1,670			1,670
Number of Investments in Unconsolidated Joint Venture | Investments				2		2			2
Office Properties [Member]
Organizational Structure [Line Items]
Number of real estate properties | property				10		10			10
Office Campus [Member]
Organizational Structure [Line Items]
Number of real estate properties | property				1		1			1
Office Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties | Portfolios				1		1			1
Office Portfolio [Member] | Austin Suburban Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties acquired | Portfolios				1		1			1
Office Buildings, Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties | property				4		4			4
Real estate area of undeveloped land | a				25		25			25
Office Property, Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties acquired | property				9		9			9
Office Property, Portfolio [Member] | Austin Suburban Portfolio [Member]
Organizational Structure [Line Items]
Number of real estate properties acquired | property				3		3			3
Retail Properties [Member]
Organizational Structure [Line Items]
Number of real estate properties | property				1		1			1
Apartment Property [Member]
Organizational Structure [Line Items]
Number of real estate properties | property				2		2			2
Undeveloped Land [Member]
Organizational Structure [Line Items]
Number of investments in real estate properties | property				2		2			2
Office Property [Member]
Organizational Structure [Line Items]
Number of first mortgage loans | Portfolios						1
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	$ 258,300	₪ 970,200,000
Principal installment payments required as percent of total debt		20.00%
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						238,202	1,114,532	56,584,976
Issuance of common stock, value | $						$ 3	$ 11
Shares of common stock sold under dividend reinvestment plan, shares									5,334,710
Redemptions of common stock, shares						256,061	2,462,746		3,537,673
Redemptions of common stock, value | $						$ 3	$ 24
Minimum [Member] | Common Stock [Member]
Organizational Structure [Line Items]
Stock offering, shares authorized for issuance													250,000
Maximum [Member] | Series A Debentures [Member] | Bonds Payable [Member]
Organizational Structure [Line Items]
Interest rate during period		4.25%
Maximum [Member] | Common Stock [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			20,000