Segments - Net Operating Income of Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Multifamily residential real estate Rental revenues	$ 15,193	$ 13,398
Segment revenues	19,234
Property expenses	3,976	3,229
Segment expenses	17,985
Net operating income	11,123	9,455
Office Real Estate [Member]
Segment Reporting Information [Line Items]
Multifamily residential real estate Rental revenues	6,549	6,486
Property expenses	2,131	1,946
Net operating income	4,418	4,540
Retail Real Estate [Member]
Segment Reporting Information [Line Items]
Multifamily residential real estate Rental revenues	5,770	5,005
Property expenses	1,825	1,680
Net operating income	3,945	3,325
Multifamily Residential Real Estate [Member]
Segment Reporting Information [Line Items]
Multifamily residential real estate Rental revenues	2,874	1,907
Property expenses	1,363	815
Net operating income	1,511	1,092
General Contracting and Real Estate Services [Member]
Segment Reporting Information [Line Items]
Segment revenues	19,234	17,956
Segment expenses	17,985	17,458
Net operating income	$ 1,249	$ 498

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

Name:	us-gaap_CostOfRealEstateRevenue
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

+ Details

Name:	us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Name:	us-gaap_GrossProfit
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

+ Details

Name:	us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration