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Stock Options and Non-Vested Shares - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted options outstanding 2,071,000   2,071,000   2,991,000
Non-vested granted shares remaining outstanding 459,000   459,000   477,000
Options granted 0 0   700,000  
Weighted-average exercise price     $ 13.86 $ 3.40  
Weighted-average fair value of options granted     $ 6.90 $ 1.64  
Total grant date fair value of options granted     $ 0.9 $ 2.2  
Total intrinsic value of stock options exercised     3.0 0.7  
Shares, Granted     216,000    
Closing stock price $ 12.45   $ 12.45    
Stock Options
         
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation cost 1.2   1.2   1.7
Weighted average remaining term recorded for options, in years     2 years 1 month 6 days   2 years 1 month 6 days
Non-Vested Shares
         
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted average remaining term recorded for options, in years     2 years   1 year 8 months 12 days
Non-vested shares, vesting period, years 4 years 4 years 4 years 4 years  
Unrecognized compensation cost $ 3.9   $ 3.9   $ 3.9
Maximum
         
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options granted     100,000    
Maximum | Non-Vested Shares
         
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares, Granted 100,000 100,000   300,000  
2003 Plan
         
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Issuance of stock options and non-vested shares 4,700,000   4,700,000    
2007 Plan
         
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Additional outstanding shares available for grant 1,600,000   1,600,000    
Shares available for grant as a percentage of the Company's outstanding common stock     5.00%