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Components of Other Income (Expense) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Component of Operating Other Cost and Expense [Line Items]      
Interest and investment income $ 336 $ 1,621 $ 73
Income tax expense (1,016) (831)  
Loss from real estate joint ventures   (188) (4,406)
Acquisition related expenses (152) (434)  
Fee income from real estate joint ventures   44 2,487
Other non-operating income 203    
Total other income (expense) $ (629) $ 212 $ (1,846)