Net Operating Income of Reportable Segments (Detail) (Predecessor, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Rental revenues	$ 13,398	$ 13,387
Segment revenues	17,956	14,641
Other		(4)
Property expenses	(3,229)	(2,864)
Segment expenses	(17,458)	(13,992)
Net operating income	9,455	9,989
Office Real Estate
Segment Reporting Information [Line Items]
Rental revenues	6,486	6,393
Property expenses	(1,946)	(1,846)
Net operating income	4,540	4,547
Retail Real Estate
Segment Reporting Information [Line Items]
Rental revenues	5,005	5,100
Property expenses	(1,680)	(1,529)
Net operating income	3,325	3,571
Mutifamily Real Estate
Segment Reporting Information [Line Items]
Rental revenues	1,907	1,894
Property expenses	(815)	(668)
Net operating income	1,092	1,226
General Contracting and Real Estate Services
Segment Reporting Information [Line Items]
Segment revenues	17,956	14,641
Segment expenses	(17,458)	(13,992)
Net operating income	$ 498	$ 649