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Earnings and Dividends per Share - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 28, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings And Dividends Per Share [Abstract]            
Shares not included in computation of diluted Earning per share     62,500 322,500 62,500 322,500
Interest Expenses added back in computation of Diluted earning per share       $ 82   $ 169
Conversion of the convertible Investor Notes       2,306,000   2,348,000
Restricted stock awards participate in nonforfeitable dividend rights     1      
Number of non-vested restricted share awards outstanding 0   0 0 0 0
Common Stock, dividends, per share, declared $ 0.050 $ 0.035        
Common Stock, dividends, per share, Paid $ 0.050 $ 0.035