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Summary of Non-Vested Shares (Detail) (Restricted Stock, USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Restricted Stock
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Shares, Beginning balance 591,108 373,862 376,702 376,702  
Number of Shares, Granted   240,724   240,724 158,614
Number of Shares, Vested (4,000) (23,478) (1,000)   (8,230)
Number of Shares, Forfeited (6,104)   (1,840)    
Number of Shares, Ending Balance 581,004 591,108 373,862 581,004  
Weighted Average Grant-Date Fair Value, Beginning balance $ 21.19 $ 24.83 $ 24.85 $ 24.85  
Weighted Average Grant-Date Fair Value, Granted   $ 14.81   $ 14.81 $ 31.06
Weighted Average Grant-Date Fair Value, Vested $ 12.16 $ 13.84 $ 31.83    
Weighted Average Grant-Date Fair Value, Forfeited $ 14.92   $ 24.23    
Weighted Average Grant-Date Fair Value, Ending balance $ 21.32 $ 21.19 $ 24.83 $ 21.32