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Mortgage Notes Payable (Parenthetical) (Detail)

9 Months Ended

12 Months Ended

Sep. 30, 2017

Dec. 31, 2016

Executive Office Park [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on July 1, 2018.

Interest rate is subject to reset on July 1, 2018.

Fixed interest rate on mortgage (in hundredth)

5.80%

^[1]

5.80%

^[2]

Morena Office Center [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on May 4, 2018.

Interest rate subject to resetting on the 6th loan anniversary.

Fixed interest rate on mortgage (in hundredth)

4.50%

^[1]

4.50%

^[2]

Pacific Oaks Plaza [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on April 28, 2017.

Fixed interest rate on mortgage (in hundredth)

4.50%

^[1]

4.50%

^[2]

Shoreline Medical Building [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate subject to resetting on the 6th loan anniversary.

Fixed interest rate on mortgage (in hundredth)

5.10%

^[1]

5.10%

^[2]

Bismarck Office Building [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.

Interest rate is subject to reset on September 1, 2023.

Fixed interest rate on mortgage (in hundredth)

4.02%

^[1]

4.02%

^[2]

Model Home Properties [Member] | Minimum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredth)

3.80%

3.80%

Model Home Properties [Member] | Maximum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredth)

5.50%

5.50%

[1]	Interest rates as of September 30, 2017.
[2]	Interest rates as of December 31, 2016.

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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