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Status Summary of Non-Vested Shares (Detail) (Performance Shares, USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Performance Shares
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Shares, Beginning balance 103,907 24,637 24,637 24,637  
Number of Shares, Granted   79,270   79,270 24,637
Weighted Average Grant-Date Fair Value, Granted   $ 14.23      
Number of Shares, Vested             
Number of Shares, Forfeited             
Number of Shares, Ending Balance 103,907 103,907 24,637 103,907  
Weighted Average Grant-Date Fair Value, Beginning balance $ 17.60 $ 28.43 $ 28.43 $ 28.43  
Weighted Average Grant-Date Fair Value, Vested             
Weighted Average Grant-Date Fair Value, Forfeited             
Weighted Average Grant-Date Fair Value, Ending balance $ 17.60 $ 17.60 $ 28.43 $ 17.60