Segments - Property Expenses of Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Rental expenses	$ 16,667	$ 14,025	$ 12,682
Real estate taxes	5,743us-gaap_RealEstateTaxExpense	5,124us-gaap_RealEstateTaxExpense	4,865us-gaap_RealEstateTaxExpense
Property expenses	22,410	19,149	17,547
Office Real Estate [Member]
Segment Reporting Information [Line Items]
Rental expenses	6,395	5,721	5,499
Real estate taxes	2,315	2,171	2,169
Property expenses	8,710	7,892	7,668
Retail Real Estate [Member]
Segment Reporting Information [Line Items]
Rental expenses	5,011	4,808	4,791
Real estate taxes	2,097	1,971	1,838
Property expenses	7,108	6,779	6,629
Multifamily Residential Real Estate [Member]
Segment Reporting Information [Line Items]
Rental expenses	5,261	3,496	2,383
Real estate taxes	1,331	982	793
Property expenses	6,592	4,478	3,176
Other [Member]
Segment Reporting Information [Line Items]
Rental expenses			9
Real estate taxes			$ 65

Other operating costs incurred during the reporting period and may include amounts paid to maintain the property.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(c))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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