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

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

- Definition

This element represents the total of the costs related to real estate revenues, including management, leasing, and development services.

+ References

+ Details

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

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

+ Details

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

- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ 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 210.5-03.3)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

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

- Definition

The aggregate revenue from real estate operations during the reporting period.

+ 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 210.5-03.1(e))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Balance Type:	credit
Period Type:	duration

- Details

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Segments - Net Operating Income of Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Rental revenues	$ 17,521	$ 16,713	$ 15,319	$ 15,193	$ 14,992	$ 14,899	$ 14,231	$ 13,398	$ 64,746	$ 57,520	$ 54,436
Segment revenues	32,060us-gaap_RealEstateRevenueNet	31,532us-gaap_RealEstateRevenueNet	20,495us-gaap_RealEstateRevenueNet	19,234us-gaap_RealEstateRevenueNet	19,373us-gaap_RealEstateRevenueNet	21,896us-gaap_RealEstateRevenueNet	23,291us-gaap_RealEstateRevenueNet	17,956us-gaap_RealEstateRevenueNet	103,321us-gaap_RealEstateRevenueNet	82,516us-gaap_RealEstateRevenueNet	54,046us-gaap_RealEstateRevenueNet
Other											(74)us-gaap_OtherCostAndExpenseOperating
Property expenses									22,410	19,149	17,547
Segment expenses									98,754us-gaap_CostOfRealEstateRevenue	78,813us-gaap_CostOfRealEstateRevenue	50,103us-gaap_CostOfRealEstateRevenue
Net operating income									46,903us-gaap_GrossProfit	42,074us-gaap_GrossProfit	40,832us-gaap_GrossProfit
Office Real Estate [Member]
Segment Reporting Information [Line Items]
Rental revenues									27,827	25,794	25,815
Property expenses									8,710	7,892	7,668
Net operating income									19,117	17,902	18,147
Retail Real Estate [Member]
Segment Reporting Information [Line Items]
Rental revenues									23,956	21,755	21,164
Property expenses									7,108	6,779	6,629
Net operating income									16,848	14,976	14,535
Multifamily Residential Real Estate [Member]
Segment Reporting Information [Line Items]
Rental revenues									12,963	9,971	7,457
Property expenses									6,592	4,478	3,176
Net operating income									6,371	5,493	4,281
General Contracting and Real Estate Services [Member]
Segment Reporting Information [Line Items]
Segment revenues									103,321	82,516	54,046
Segment expenses									98,754	78,813	50,103
Net operating income									$ 4,567	$ 3,703	$ 3,943