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Shareholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Apr. 24, 2013
Class of Stock [Line Items]          
Preferred stock dividends (in dollars per share)     $ 450    
Preferred stock dividend rate     6.00%    
Stock Issued during period, Fair Value per Share, Acquisitions         $ 4.23
Common stock dividends (in dollars per share)     $ 0.1125    
Other Comprehensive loss, pension and postretirements obligations, before tax     $ 86 $ 106  
Change in pension and postretirement obligations, net of tax $ 10 $ 11 $ 30 $ 37