General - Schedule of Effect of Revisions (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Quarterly Financial Information [Line Items]
Revenues from rental properties	$ 24,014	$ 24,692	$ 71,911	$ 70,136
Earnings from continuing operations	8,996	13,682	23,475	26,360
Net earnings	10,235	41,877	26,510	64,966
As Previously Reported [Member]
Quarterly Financial Information [Line Items]
Revenues from rental properties		25,425		72,360
Earnings from continuing operations		15,295		29,031
Net earnings		41,877		64,966
Reclassifications [Member]
Quarterly Financial Information [Line Items]
Revenues from rental properties		(733)		(2,224)
Earnings from continuing operations		(680)		(945)
Revisions [Member]
Quarterly Financial Information [Line Items]
Earnings from continuing operations		$ (933)		$ (1,726)