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Stock Option Plans and Restricted Stock Grants - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 5 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2012
Stock Options [Member]
May 31, 2008
2008 Equity Incentive Plan [Member]
Dec. 31, 2012
2008 Equity Incentive Plan [Member]
Dec. 31, 2011
2008 Equity Incentive Plan [Member]
Dec. 31, 2012
Two Thousand Stock Option Plan [Member]
Dec. 31, 2012
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 2,604,000 2,865,000             1,016,586  
Total expenses on stock option $ 1,100,000 $ 1,100,000 $ 1,400,000              
Stock options granted under Black-Scholes options pricing model 248,000 31,000 397,000              
Vesting period         5 years   5 years      
Weighted-average grant-date fair value of options granted $ 4.44 $ 3.07 $ 2.76              
Intrinsic value of options exercised 618,000 20,000 1,200,000              
Forfeiture rate 6.00%                  
Unrecognized compensation cost related to nonvested options granted 1,700,000                 2,300,000
Weighted-average period for expected cost recognized 2 years 11 months 23 days                  
Fair value of options vested 1,100,000 1,500,000 1,500,000              
Cash received from stock option exercises 2,600,000 59,000 1,500,000              
Common stock, shares outstanding 104,889,586 104,482,271     2,603,942          
Number of common shares, options exercisable 1,861,000     1,861,342            
Options exercisable lower price range $ 7.68                  
Options exercisable upper price range $ 15.53                  
2008 Equity Incentive Plan, granted restricted stock awards             173,000 0    
Weighted average fair value of restricted stock             $ 11.1      
Period of compensation cost recognized 5 years                  
Amount of compensation cost recognized $ 911,000 $ 1,100,000 $ 775,000              
Common stock available for the granting of future options and restricted stock 1,589,127