Acquisition Fee as Percent of Purchase Price of Assets Acquired

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- Definition

Common Stock, Shares Acquired during Period

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Common Stock, Shares Acquired during Period, Value

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Disposal Group, Including Discontinued Operation, Closing Cost

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Disposal Group, Including Discontinued Operation, Costs and Expenses

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- Definition

Divestment Fee as Percent of Sale Price of Assets Disposed

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- Definition

Equity Method Investment, Common Units Acquired

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Equity Method Investment, Common Units Owned

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- Definition

Management Fee as Percent of Annual Distributable Income

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- Definition

Number of real estate properties acquired.

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Number of Real Estate Properties Disposed.

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- Definition

Percent of Shares Not to be Sold, Pledged or Transferred

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- Definition

Performance Fee as Percent of Growth in Distributions

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- Definition

Period from Listing in Which Shares Not to be Sold, Pledged or Transferred

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- Definition

Sale of Stock, Number of Shares Purchased

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Sale of Stock, Number of Shares Sold

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Sale of Stock, Period of Sale After Listing

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- Definition

Area of land held.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Gross amount of debt extinguished.

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Balance held at close of period in number of shares.

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Net rentable area for properties owned.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of new stock issued during the period.

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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RELATED PARTY TRANSACTIONS (Singapore Transaction) (Details) $ / shares in Units, $ in Thousands									12 Months Ended
	Nov. 01, 2019 USD ($) ft² property shares	Oct. 29, 2019 USD ($) shares	Nov. 30, 2018 USD ($) a ft² property	Nov. 26, 2018 USD ($) shares	Nov. 08, 2017 USD ($) property	Nov. 02, 2017 $ / shares shares	Oct. 25, 2017 shares	Oct. 24, 2017 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property	Dec. 15, 2017 shares	Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items]
Real estate held for sale, net									$ 0	$ 128,146
Payments to acquire investments									0	0	$ 12,514
KBS Pacific Advisors, LLC
Related Party Transaction [Line Items]
Ownership %	50.00%
Keppel Capital Holding Pte. Ltd.
Related Party Transaction [Line Items]
Ownership %	50.00%
Investments in unconsolidated entities	$ 27,500
SREIT
Related Party Transaction [Line Items]
Payments to acquire investments					$ 52,500
Ownership %	6.89%	6.89%			9.50%							7.00%
Number of shares owned (in shares) \| shares												43,999,500
Common units owned (in shares) \| shares	56,979,352
Common units acquired (in shares) \| shares		7,186,000
Investments in unconsolidated entities		$ 5,200
Management fee		10.00%
Performance fee		25.00%
Acquisition fee as percent of purchase price of assets acquired		1.00%
Divestment fee as percent of sale price of assets disposed		0.50%
Singapore Portfolio
Related Party Transaction [Line Items]
Extinguishment of debt					$ 401,700
Singapore Portfolio
Related Party Transaction [Line Items]
Real estate held for sale, net													$ 546,500
Disposed of by Sale
Related Party Transaction [Line Items]
Closing costs									$ 12,667	$ 36,736	$ 104,589
Disposed of by Sale \| SREIT
Related Party Transaction [Line Items]
Common stock, shares acquired (in shares) \| shares				12,979,852
Common stock, shares acquired				$ 6,500
Ownership interest	6.89%	6.89%		7.00%
Disposed of by Sale \| SREIT
Related Party Transaction [Line Items]
Issuance of common stock (in shares) \| shares	56,979,352			186,236,224
Common stock, shares acquired (in shares) \| shares		7,186,000
Common stock, shares acquired		$ 5,200
Disposed of by Sale \| Office/Flex/Industrial Buildings
Related Party Transaction [Line Items]
Number of real estate properties disposed \| property										21
Disposed of by Sale \| Office Properties
Related Party Transaction [Line Items]
Number of real estate properties disposed \| property									1	1	12
Singapore Portfolio \| Disposed of by Sale
Related Party Transaction [Line Items]
Consideration					804,000
Closing costs					7,700
Real estate held for sale, net					$ 543,200
Number of real estate properties disposed \| property					11
Closing costs					$ 7,700
Westpark Portfolio \| Disposed of by Sale
Related Party Transaction [Line Items]
Consideration			$ 166,400
Closing costs			$ 3,200
Westpark Portfolio \| Disposed of by Sale \| Office/Flex/Industrial Buildings
Related Party Transaction [Line Items]
Number of real estate properties disposed \| property			21
Net rentable area \| ft²			778,472
Area of land \| a			41
125 John Carpenter \| Disposed of by Sale
Related Party Transaction [Line Items]
Consideration	$ 99,800
Closing costs	200
Real estate held for sale, net	82,400
Closing costs	$ 200
125 John Carpenter \| Disposed of by Sale \| Office Properties
Related Party Transaction [Line Items]
Number of real estate properties disposed \| property	2
Net rentable area \| ft²	445,317
Singapore Transaction \| IPO [Member]
Related Party Transaction [Line Items]
Shares purchased (in shares) \| shares						262,772,400
Sale of stock (in dollars per share) \| $ / shares						$ 0.88
Singapore Transaction \| IPO [Member] \| KBS SORP
Related Party Transaction [Line Items]
Sale of stock, number of shares purchased (in shares) \| shares							59,713,600					15,714,100
Sale of stock, number of shares sold (in shares) \| shares							15,714,100
Sale of stock, period of sale after listing							30 days
Percent of shares not to be sold, pledged or transferred						50.00%
Period from listing in which shares not to be sold, pledged or transferred						12 months
Asset management fees \| SREIT
Related Party Transaction [Line Items]
Due from related parties									$ 5,100
Acquisition fees on real estate \| SREIT
Related Party Transaction [Line Items]
Due from related parties									$ 1,000
Singapore Portfolio
Related Party Transaction [Line Items]
Purchase price								$ 804,000
Number of real estate properties acquired \| property								11