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Stock Option Plans and Restricted Stock Awards - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2013
Stock Options [Member]
May 31, 2008
2008 Equity Incentive Plan [Member]
Dec. 31, 2013
2008 Equity Incentive Plan [Member]
Dec. 31, 2012
2008 Equity Incentive Plan [Member]
Dec. 31, 2011
2008 Equity Incentive Plan [Member]
Dec. 31, 2013
2008 Stock Option Plan [Member]
Dec. 31, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Authorized issuance of shares of Company common stock           3,949,891          
Expiry of equity incentive plan             Dec. 31, 2018        
Stock option plan, options outstanding 2,106,000 2,604,000               721,406  
Total expenses on stock option $ 850,000.0 $ 1,100,000 $ 1,100,000                
Stock options granted under Black-Scholes options pricing model 45,000 248,000 31,000                
Vesting period         5 years     5 years      
Forfeiture rate 6.00%                    
Intrinsic value of options exercised 1,400,000 618,000.0 20,000.0                
Unrecognized compensation cost related to nonvested options granted 1,100,000                   2,500,000
Weighted-average period for expected cost recognized 2 years 6 months 15 days                    
Fair value of options vested 918,000.0 1,100,000 1,500,000                
Cash received from stock option exercises 4,500,000 2,600,000 59,000                
Common stock, shares outstanding 105,370,170 104,889,586     2,105,843            
Number of common shares, options exercisable 1,635,000     1,635,043              
Options exercisable lower price range $ 7.68                    
Options exercisable upper price range $ 15.53                    
2008 Equity Incentive Plan, granted restricted stock awards             100,000 173,000 0    
Weighted average fair value of restricted stock             $ 13.25 $ 11.10     $ 13.25
Period of compensation cost recognized 5 years                    
Amount of compensation cost recognized $ 1,100,000 $ 911,000 $ 1,100,000                
Common stock available for the granting of future options and restricted stock 1,526,828