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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Grant Value, Granted $ 2.38 $ 2.50 $ 2.53
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested Restricted Shares, Beginning Balance 168,117 153,718  
Non-vested Restricted Shares, Granted 91,000  
Non-vested Restricted Shares, Vested (92,683) (76,601)  
Non-vested Restricted Shares, Ending Balance 75,434 168,117 153,718
Weighted Average Grant Date Fair Value, Non-vested Beginning Balance $ 6.36 $ 5.57  
Non-vested restricted shares, Expected to vest 75,434    
Weighted Average Grant Value, Granted   7.00  
Weighted Average Grant Value, Vested $ (5.88) (5.54)  
Weighted Average Grant Date Fair Value, Non-vested Ending Balance 6.95 $ 6.36 $ 5.57
Weighted average grant date fair value, Expected to vest $ 6.95