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Share-based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares, beginning of the year 23    
Shares, Granted 37    
Shares, Vested (21)    
Shares, Forfeited 0    
Non-vested shares, end of the year 39 23  
Weighted Average Grant Date Fair Value, Non-vested restricted stock, beginning of the year $ 16.74    
Weighted Average Grant Date Fair Value, Granted 16.37 $ 15.36 $ 16.23
Weighted Average Grant Date Fair Value, Vested 16.62    
Weighted Average Grant Date Fair Value, Forfeited 0    
Weighted Average Grant Date Fair Value, Non-vested restricted stock, end of the period $ 16.46 $ 16.74