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Summary of Significant Accounting Policies - Estimated Useful Lives of Property Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Building and Building Improvements [Member]
Dec. 31, 2011
Building and Building Improvements [Member]
Dec. 31, 2012
Property and Equipment [Member]
Dec. 31, 2011
Property and Equipment [Member]
Dec. 31, 2012
Minimum [Member]
Building and Building Improvements [Member]
Dec. 31, 2012
Minimum [Member]
Property and Equipment [Member]
Dec. 31, 2011
Maximum [Member]
Building and Building Improvements [Member]
Dec. 31, 2011
Maximum [Member]
Property and Equipment [Member]
Property, Plant and Equipment [Line Items]                    
Property plant and equipment, useful life             10 years 2 years 40 years 10 years
Property plant and equipment, gross $ 10,580 $ 10,342 $ 4,835 $ 4,916 $ 5,745 $ 5,426        
Less: accumulated depreciation (5,721) (5,164)                
Property Plant And Equipment, Net $ 4,859 $ 5,178