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Status Summary of Non-Vested Shares (Detail) - Performance Based Restricted Stock - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Beginning balance 111,407 103,907 103,907  
Number of Shares, Granted   7,500 7,500 0
Number of Shares, Vested 0 0    
Number of Shares, Forfeited 0 0    
Number of Shares, Ending Balance 111,407 111,407 111,407 103,907
Weighted Average Grant-Date Fair Value, Beginning balance $ 17.35 $ 17.81 $ 17.81  
Weighted Average Grant-Date Fair Value, Granted   10.96    
Weighted Average Grant-Date Fair Value, Vested 0 0    
Weighted Average Grant-Date Fair Value, Forfeited 0 0    
Weighted Average Grant-Date Fair Value, Ending balance $ 17.35 $ 17.35 $ 17.35 $ 17.81