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Employee Share-Based Compensation Plans - Summary of Non-vested Restricted Share Activity Under the Restricted Share Plans (Detail) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Value, Granted $ 2.55 $ 2.38 $ 2.50
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested Restricted Shares, Beginning Balance 75,434 168,117  
Non-vested Restricted Shares, Granted 13,500  
Non-vested Restricted Shares, Vested (73,851) (92,683)  
Non-vested Restricted Shares, Ending Balance 15,083 75,434 168,117
Weighted Average Grant Date Fair Value, Non-vested Beginning Balance $ 6.95 $ 6.36  
Non-vested restricted shares, Expected to vest 15,083    
Weighted Average Grant Value, Granted $ 6.98    
Weighted Average Grant Value, Vested (6.94) (5.88)  
Weighted Average Grant Date Fair Value, Non-vested Ending Balance 6.98 $ 6.95 $ 6.36
Weighted average grant date fair value, Expected to vest $ 6.98