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Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Beginning Balance 7,707,713  
Options granted, Shares 86,000  
Options forfeited, Shares (58,073)  
Options expired, Shares (37,061)  
Options exercised, Shares (206,811)  
Number of shares, Ending Balance 7,491,768 7,707,713
Weighted average exercise price, Beginning Balance $ 7.48  
Options granted, Weighted average exercise price $ 10.12  
Options forfeited, Weighted average exercise price $ 5.39  
Options expired, Weighted average exercise price $ 12.13  
Options exercised, Weighted average exercise price $ 6.65  
Weighted average exercise price, Ending Balance $ 7.52 $ 7.48
Weighted average remaining contractual term, End of the period 6 years 9 months 22 days 6 years 11 months 27 days
Aggregate intrinsic value, Outstanding Ending Balance $ 27,477 $ 17,148