Organization and Business - Additional Information (Details) ft² in Millions		9 Months Ended
Nov. 24, 2014 $ / shares shares	Sep. 30, 2015 ft² Properties Fund
Real Estate Properties [Line Items]
Number of office properties		12
Area of office properties \| ft²		10.4
Office properties occupancy rate		91.10%
Percentage of ownership in operating partnership		80.40%
Predecessor [Member]
Real Estate Properties [Line Items]
Number of office properties		12
Number of real estate funds \| Fund		15
Predecessor [Member] \| Primary Funds [Member]
Real Estate Properties [Line Items]
Number of real estate funds \| Fund		9
Predecessor [Member] \| Parallel Funds [Member]
Real Estate Properties [Line Items]
Number of real estate funds \| Fund		6
Predecessor [Member] \| Partially Owned Properties [Member]
Real Estate Properties [Line Items]
Number of office properties		3
IPO [Member]
Real Estate Properties [Line Items]
Common shares issued, initial public offering, shares \| shares	150,650,000
Common stock, share price \| $ / shares	$ 17.50

Number of real estate funds.

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- Definition

Percentage of square feet of office properties occupied.

+ References

No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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